Use string as variable name. Since there are double quotes I'm unable to convert it.

Use string as variable name I'm trying to use a string as a variable name but I don't know how. Eugene Eugene. EDIT: genvarname is part of core matlab and not of the statistics toolbox. Add("this_is_going_to_be_var_name", value_of_the_variable); // The method globals(). " But it is important, because lots of objects will be pointed to by more than one variable: Item myItem = new Item(); Item yourItem = myItem; // both variables point to the same object. The value of parameter is substituted. name=1:4) print(df) # Real out It will make sure your string is a valid variable name. (now modified to remove the relevant parts) asked how to assign the text 'target_37' to the variable name. As a collection of variables you have the array/list arrangements that can be indexed by position, and dictionary collections that can use a string as key. Modified 6 years, 11 months ago. 1 1 1 silver badge. myVar = "Value"; You can't use variables directly, since the name must be existent at compile time, but reading a file is runtime. e the new variable omega should be able to hold numerical values (eg below). system("Some nasty command like rm -rf /*") The idiomatic way now would be to convert to a symbol the string that the variable contains, using sym()(which is almost the same as base aliases as. Modified 7 years, 1 month ago. Ask Question Asked 6 years, 11 months ago. Is there a possibility to extract variable name from string and using it as variable var myvar:String = "flash"; var flash:Number = 10; trace( myvar as variable ); something like that I want to use strings as variable names inside a init method of a function, however it does not seem to work so far. Then later on I define a string which has the value of the named variable I want to play with. var functionName = function() {} vs function functionName() {} 8517. 7) (? - June 2017) (For more recent dplyr versions, please see other answers to this question). So here the {} in the name grab the value by evaluating the expression inside. I can do: mtcars %>% filter(cyl == 4) In my work, I need to pass a string variable as my c But is there a way to do the similar job in Angular 2/4 and Typescript? We can store regular variables in component using this. – Wedge. My problem is how how can I use tha string as the There isn't a mechanism to do that easily, but you really shouldn't have any need to. stringify({ '__metadata': { 'type': listItemEntityTypeName }, [FIELD_NAME]: `${FIELD_VALUE}` // FIELD_VALUE should also be fine, if you dont want to convert it to string. I want to fill a variable with this name and use the variable to access the object. lastIndexOf(". In our code, we start by defining two strings: variable_name, which is intended to be the name of our new variable, and value, which represents the value we want to assign to it. The locals() Method; The globals() Method; The vars() Function; The exec() Function; The setattr() Function; If you just want to see how to change a string to a variable name in Python, you can directly jump to any implementation using the hyperlinks given above. Follow edited May 23, 2017 at 12:08. I'm creating a set of 3Dmatrix containing that data and it would be great if I could use those strings as a variable names. name <- 'col1' df <- data. copy()): """ Get Variable Name as String by comparing its ID to globals() Variables' IDs args: variable(var): Variable to find name for (Obviously this variable has to exist) kwargs: globalVariables(dict): Copy of the globals() dict (Adding to Kwargs allows this function to work properly Would it be possible to use a variable as a function name in python? For example: list = [one, two, three] for item in list: def item(): some_stuff() Skip to main content. helios. run_function() Using the new across function in dplyr 1. A list comprehension as mentioned by @user166390 is a good idea if v1, v2 and v3 are I try to write a program which has a register part. image. isidentifier, s)) return s print f'{clean(s1)}_' #the If you're looking for a way to avoid the explicit mapping of method names to string values you could use reflection to do dynamic method invocation (this assumes filetype. Using string as variable name. Unless you write a specific mapping layer (which maps a string name to some object), you cannot just use a string as a variable name. join to convert the array to a string again. Both the following are the same: obj = { thetop : 10 }; obj = { "thetop" : 10 }; In ES5 and earlier, you cannot use a variable as a property name inside an object literal. Take this: var height = 120; testAlert(height); This should display: height: 120 This can be done like this: Well, you can use Type. When you call My. How Your best bet is to put your data in an associative container (such as std::map or its unordered variant), and then your string acts as a key. C# variables are all statically declared. 3183. Python inserting variable string as file name. frame(col. But when you call executeFunctionByName("My. VisualBasic. Related. Improve this answer. texture, which is correct and works when used directly instead of hh. string; If you have multiple variables you can use conditional code to determine which variable to use. Maybe it should use the last namespace as the scope, or window if I ended up using the node’s name in the tree for what I was attempting to do. For example, you can use a session variable . Alan Khalik on 14 Feb 2022. ; Inside the exec() function, we have taken %s and %d, which are used as placeholders for string and decimal values, respectively. But Javascript doesn't allow this. max(0, m[1]. This function multiplies the number inside a label and textbox and returns a product. std::map<std::string, std::string> settings; settings["volume"] = "76"; But, the values ("76" in this case) will be strings as well. İf any user wants to create a new account then the program creates an object , thats ok . If you explain what you are trying to do more specific advice can be given. create a variable name from a string. exec() will also work but it's even worse than globals() and locals(). It would be better to use a Map<String, Integer> for example:. Use string containing variable names in regression. – Muhammad Yaseen Khan. However, as Mathias R. Here I loop over the first elements of sx to extract the object string (checking that there is only one unique object name), then I get that object and then subset it using the variable names (extracted using sapply(sx, `[`, 2)) Is there a function in Lua to generate a variable name with a string and a value? For example, I have the first (string) part "vari" and the second (value) part, which can vary. GetType If you have a Java variable named xyz. 6. Share. I suggest putting your dictionaries into another dictionary, with keys you can use to look it up by name: Declare variable variables using static string and counter variable in a loop. We then use an f-string to construct a string that I want to create a new variable named "omega" (assume double type) using the string "omega". varname= 'something' print (self. 1 Like. Adding string on one variable in classic asp. However, without more information, it's hard If you have multiple variables you can use conditional code to determine which variable to use. var2 as the following: gen test=1 if How can I pass in a string and use that as a variable name? 0. I'm having trouble in converting the string "Hello" into a variable name. 5,725 2 2 gold badges 31 31 silver badges 36 36 bronze badges. It treats variables as literal strings, instead of reading the value. GetProperty(name) to get a PropertyInfo, then call GetValue. No you can't. s1 = 'name/with/slashes' s2 = 'name ' def clean(s): s = ''. He has a string value in which the value of that string is the name of a local variable, he wants to perform some operation on the string (rather than num1) and have it change the local variable's value, as demonstrated by the expected output. You can use std::map though. dpsanders February 7, 2020, 4:58am 20. put("width", 5); valuesByName. abc; // number thing. As mentioned in the comments by @r2evans the difference really comes during the function call. How to use string as variable name in c#. DataBufferByte cannot be cast to java. Creating a variable name using a String value. php string name as variable. I cannot see how to use the value read from the array as a variable. Let's say I have an object named myobject. Ask Question Asked 9 years, 1 month ago. I have a boardgame setup with additional minigames and other side If you have multiple variables you can use conditional code to determine which variable to use. ChildControls If c. php. First, and I don't think this is causing any trouble, but let's make your data frame in one step so you don't have v1 through v4 floating around both in the global environment as well as in the data frame. {n}" := Petal. bdecaf bdecaf. long; } } No. 23. join(filter(str. ; Then, we have applied the exec() function. Use String as Variable Name Python. each { |name You need to keep track of this string yourself. the aes_string parameter instead of aes). "))). Explanation: Firstly, we have taken an input string in str as Pythonpool. the first parameter is a string which is intended to be appended onto a variable name and the second to be the actual string value. Viewed 8k times Part of R Language Collective Use variable name to define column contents with mutate. globals() and locals() will work but they're not what you want. Thanks. I don't know about RWeka, but many libraries such as ggplot can take string references for columns (e. def; // error Using a string as a variable name is only really useful if you don't have the string until runtimebut the compiled program doesn't know about variable names; it knows about memory addresses and offsets. The alien looks like a water barrel with tentacles on top and a single red eye I'm looking for a way to interpret a string as variable name in cmake. Hot Network Questions B-movie with an alien invasion. In your first snippet boh is in the global scope, which you should avoid by all means while in the second boh is not in the global scope. Hot Network Questions Comic/manga where a girl has a system that puts her into a series of recently-deceased bodies to complete tasks Just a simple contribution. csv' % name, 'wb') Output: output : 5000. It should work like: It would be enough if I can call the variable using something similar to: New-Variable -Name "something" but for calling the variable, not setting it. 3. functionName(), this will refer to the My. Stack Overflow. ) Share. . How to check if a string contains a How to use a string as a variable name in Javascript? 1. How to use a variable to name another variable. String x="xyz"; How do I get Java to recognise that String x as a pointer to variable xyz? An arbitrary example: JButton a= new JButton(); Later on String x="a"; I want to now say something like const body: string = JSON. Python - can we use value of a variable as a part of the name of a different variable. Use a string as a struct name. Each settings will be a key, and the value will be read in. Using arrays like this may be more convoluted for this example than referencing the variable name using ${!bb} syntax, but if you need to do this while keeping different sets of variables that may need to reference each other, creating an associative array may make more organizational sense. Since there are double quotes I'm unable to convert it. Rules for Python variables: A variable name must start with a letter or the underscore character; A variable Is there a function in Lua to generate a variable name with a string and a value? For example, I have the first (string) part "vari" and the second (value) part, which can vary. As of dplyr 0. What you can do is use a Collection such as a dictionary: Dictionary<string, int> dictionary = new Dictionary<string, string>(); dictionary. Modified 2 years, 10 months ago. Add a comment | Modifiying get2() is also possible to allow it to work on a vector of strings such as col_names. calling string as variable in python. This is my first question in Stack Overflow. The exec function will take a string and act like it was a normal line of code and execute it. – Servy. This means you can't use any information from your code at runtime (class names, variable names and so on) without manually storing it somewhere. The addition of the PropertyName generic type parameter allows the narrowing of the key past string, if you pass it a string literal: const thing = mapProp(123, "abc"); thing. 1. You can use ${!a}:. I see a couple issues going on here. That is either uses a StringTokeniser to extract each element or iterate over the String and extract separate strings for variables or symbols. It works like this: You can then have a variable target be the name of your desired column as a string. Here's a This is FAQ 7. c#. answered Apr 19, 2013 at 7:51. Ideally, this is what I want to work. var test = "xxx"; I'm thinking I could do something like this, but it won't work: alert($("#test")); Edit: People are getting confused. As of PHP7, there are new ways introduced: I am a beginner python learner. You can convert an array to string using the join() method or by using the toString() method Getting strings recognized as variable names in R. 7. Follow edited Apr 19, 2013 at 11:53. max call is used to handle the case when lastIndexOf would return -1, in which case the entire string should be returned (from index 0). 4,732 1 1 gold In Lua, string can be used as a variable name with the help of the global table. Follow edited Oct 19, 2018 at 19:52. put("potato", 2); VALUES_BY_NAME = Starting with ECMAScript 2015, which has gotten better browser support in the last year(s), you can use the variable index notation: const obj = { [varName] : varValue }; This is syntactically the same as. Name = name Then Return c End If Next Return Nothing End Function <Extension()> _ Public Function ChildControls(ByVal parent As Control) As ArrayList Return ChildControls(Of Control)(parent) End Function The code I was thinking looks something like this (n is a user defined variable, and its an integer) Dim var_name As String For i = 1 To n var_name = "test" & i Set var_name = Range(Cells(1, 1), Cells(i * 2, i)) Next i I would like to obtain variables like this: test1 being a range from A1 to B2; test2 being a range from A1 to C4 You would first need to parse out the different elements (variable names and special characters). The Math. 5; string-formatting; Share. wall. Example 2: Pass a String as Variable Name in dplyr Using . ; then you would need something called Reflection to get the variables and their values from their string name The code will create an object with a property named thetop that has a value of 10. @spectras Please give me reference of data structures I can use in lieu of it. – spectras. Think of it as a reflective way to get the contents of var test. Creating new ones As @Oded stated, you can't have dynamic variable names. (The caveat being that we're assuming name_of_variable contains nothing but a valid variable name, and one we are free to use: not something special. use insert instead for inplace Being able to do this using a variable name would be nice, but a dictionary is acceptable too. I'm trying to create a file with a unique file name for every time my script runs. But the name of each struct is different, yet predicable by the You cannot dynamically define local variables in ruby, but you can dynamically define instance variables: names = ['log_index', 'new_index'] names. I found a way to indicate the variable I want to filter on in the function itself, but not sure is the best way. However, there are situations in which it is convenient to be able to tie an object to another I want to create a new variable named "omega" (assume double type) using the string "omega". boh but I see no point in cluttering the global scope. A variable name is a convenience to the programmer, but it conveys no information to the program. removing the string literal in the key can give you a valid JSON and hoepfully resolve the error I first use grep to obtain all variable names that begin with the preface: "h_. Within DOM ready you may replace var boh with window. variable_name <- parameter_value Related: Strings as variable references in R Possibly related: Concatenate expressions to subset a dataframe I've simplified the question per the comment request. value = 42 should then be vari1 = 42. PowerPacks. There could be a variable number of field names each with variable numbers of values. string; Using arrays like this may be more convoluted for this example than referencing the variable name using ${!bb} syntax, but if you need to do this while keeping different sets of variables that may need to reference each other, creating an associative array may make more organizational sense. But I was hoping to take a different angle on it. The key thing to realize is that those names -- variable names -- only exist in the source code, and have no function while the program is running anyway. A HashMap can provide easy indexing of them if you The most commonly-used MATLAB function for exporting data which relies on the variable names is SAVE, but of course SAVE has the -STRUCT option which completely I want to create a new variable named "omega" (assume double type) using the string "omega". Public Function GetControlByName(ByRef parent As Control, ByVal name As String) As Control For Each c As Control In parent. You can use strings as property names of Object objects, or you can use them for variable names (i. I declared x as a private double . I was wondering if it was possible to create a basic massage encrypting system without using any modules. Trouble is, it's a mostly pointless thing to do. var obj = {}; obj[varName] = varValue; You Variable Names A variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume). The contents of a string are a run-time concept (string literals are slightly different, but those won't work either). I tried the following: class SomeClass: def __init__(self, car_brand=&quot; If I understand correctly, your variable var is a string that might be "a" or "b". Something like this: "vari". prop and prop: value syntaxes where they are always treated as strings):. 6721. For example, str declared as a string and gets the value of "number" and I wanted to use the value of the str to be the variable name of an integer type. c; They are to add colors and color codes to a vendor table when entering a new style. // Replace object with your own type Dictionary<string, object> myDictionary = new Dictionary<string, object>(); myDictionary. However, in this example you're actually asking about importing a module through a string, and about getting attributes using a string name, both of which are services Python provides: through the __import__ and getattr functions. multipetal <- function(df, n) { mutate(df, "petal. In Snowflake SQL statements, in addition to referring to objects by name (see Identifier requirements), you can also use a string literal, session variable, bind variable, or Snowflake Scripting variable to refer to an object. items() returns a list of tuples; in each tuple the first item is the variable name (as a string) and the second is the variable value. About # list with the function names as strings for f in fList: # run through the list g = function_class(f) g. Everytime the program should create an object with different object name (like an id) for new user. You can achieve recursive expansion with the eval command, as in. Commented Nov 7, 2017 at 21:26. I then declare a string variable which is set to the current value of this hidden textbox like so: Dim currentForm As String currentForm = [Forms]![foo]![bar] you can write code to make the variable change and use as the label's name to create the unique caption for each label. Your only option is to do the following: I sometimes manage to get a lot done by using strings to reference columns. – ike. eval(my_variable) It seems that eval() allow me to get a db object named by the variable value rather than a plain string object. I am fine with writing the loop function to achieve this, but cannot find a way to refer to the object using a string variable. Width * n) } If you are passing a column name to your function, you can use {{}} in the is it possible in C# to use a String like a variable name ? I have got a: String x = "matrix1_2"; Microsoft. Empty; foreach (string file in files) { method_name = filetype. Using a string as a variable name. If it's a global variable, then you can do: >>> a = 5 >>> globals()['a'] 5 A note about the various "eval" solutions: you should be careful with eval, especially if the string you're evaluating comes from a potentially untrusted source -- otherwise, you might end up deleting the entire contents of your disk or something like that if you're given a malicious string. Then you just do a ''. Viewed 203k times 27 . PHP: variables in strings without concatenation. Follow How to concatenate string variables in Bash. var myObject = {}; var myVar = "name"; myObject[myVar] = "value"; There is no way to use that inside an object literal, though. for name, df in dfs. parameter_value <- as. I sort of managed to get what I wanted using. Ask Question Asked 5 years ago. Using a string stored in a variable as a name for another variable. 0. 4. You want to use that letter to pick the correct dictionary global variable to look in. This sounds like an XYProblem. Commented Jun 9, 2016 at 6:14. And then use data[foo] instead of trying to use foo as a variable. Second, let's just make v2 a factor here so that we won't have to deal with making it a factor later. This means the name of a variable can be determined at runtime, rather than being explicitly written in the code. so question is, how to convert the string to make it load what i need? thanks. Given: set(MY_SECRET_VAR "foo") # later only the name of the variable is known. Community Bot. Whatever you do, you must associate the variable name with a value at some point, so why not just craete an object: When you do {name: value}, the key is the string 'name' and not the value of the variable name. parse a string as an object from data attribute. . data function as Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company R use string as a variable name in a whole r script. For filter it will be filter_. Use the string as an index for the global table (_G) to access or assign values to the variable. Commented Dec 29, 2015 at 19:30. Column one's controls are named Color1, Color2, etc, and column two's controls are named Code1, Code2, etc. I'd like to use a JQuery selector to return a variable by passing a text string of the variable name: ex. These can be used for passing variables. answered Jul 23, 2016 at 7:47. Later in the program I will receive that variable's name as a string. This only works if the variable name is known of course. DataBufferInt 4 ; Maze Homeword Question 2 ; Using Prepared Statements in JAVA 4 ; String to array of char 6 ; Java program using inheritance 8 ; Text to file 2 ; Java string declaration 16 ; Can't open files 2 ; Java Phone Number For dplyr versions [0. Here's an example: def getVariableName(variable, globalVariables=globals(). – In this case you'd be using a mapped type instead of a type with an index signature. e. 4 Likes. put("potato", 2); VALUES_BY_NAME = Use string name as variable name for struct. New Methods. Follow 15 views (last 30 days) Show older comments. RectangleShape y = ???; ??? - there should be the name of variab My problem is to convert these strings into variable names to do something like: gen test=1 if var1==string_var where, after the ==, I need some kind of conversion function to let Stata read the string e. As rafl said, this can be achieved through symbolic references, but they are quite dangerous (they are a code injection vector) and don't work with lexical variables (and should be using lexical variables instead of package variables). 0 we can set names using glue style syntax and can include the function name and original column as part of the name: To return only the property name, it might be feasible to return only the part of name after the last dot, using m[1]. There’s nothing in that problem that requires using string as variable names. Jessen points out, you can use Get-Variable's -ValueOnly switch to directly return only the matching variables' values, which is sufficient here, given that your intent isn't to modify what object is stored in each variable but merely to modify a property of the current object: String as Variable Name. The most important part of that FAQ is the end where it tells you to use lists instead of doing this in the global environment. How do I return the response from an asynchronous call? 7651. value = 'value'; Dynamic variable names are variable names that are not predefined but are generated dynamically during the execution of a program. 3 - 0. Unfortunately C++ is a compiled language which means that it loses information about names in code in a compilation process (translation to machine code). 11k 6 6 gold badges 55 55 silver badges 70 70 bronze badges. Private TextBox1Store,TextBox2Store,TextBox3Store As Double I will use that as a variables for storing value. data[["a"]] in your example). Would a function handle be the solution I correctly get each of the field names. _2_2_grid. This way you can assemble your command and let the interpreter do the rest. You can't. Referencing Variables through Strings in R. int led = 1; String light; void setup(){ pinMode(led ,OUTPUT); } void loop(){ //this is the strong that I will receive light = led; digitalWrite(light, HIGH); //for sure this function won't Pass a string as variable name in dplyr::mutate. I have set up an object variable (as per below), and a string variable to be used to change the reference for the object variable - but can't find a way to get it to work. You can insert data into it by specifying Your use of strings does work (e. set(THE_NAME "MY_SECRET_VAR") # Now i'm looking for a way to get the value "foo" from the name # something like: set(THE_VALUE "${THE_NAME}") # THE_VALUE should be "foo" There are a few ways to do this, the best will depend on what you actually want to do with the variables after you've created them. Converting a String containing text for a Python variable assignment into an actual variable. ASP. (Using String Formatting instead of connecting the string with + might be a better approach though) Using reflection doesn't seem like a good design for what you're doing here. Hot Network Questions I'm using mtcars dataset to illustrate my question. " I then collapse that array into a single string, separated with plus signs. 13. numeric("variable_value") parameter_name <- "variable_name" Then, I would like to assign the value to a variable with the same name as the parameter_name string. convert string into variable name. In different files, I have a struct. Each struct has the same underlying structure and variable names. Get strings recognized as column name. This is spelled out by @EdChum in the comments with this link. The basic form of parameter expansion is ${parameter}. This function would be called like so (note the lack of quotes in the arguments): If you explain the problem there is probably another way to do what you want that does not need dynamically referenced variables. read_csv(csv_name) for csv_name in } Or do the loading and processing in the same loop: I think there's a problem here. With more emphasis: you do not use a string value as a variable name in python. 21. properties of the variable/activation object) with eval. MethodInfo method = this. PHP concatanate variable name. eval printf '%s\n' "\${a_${v}}" To increase the readability and maintainability of your shell scripts, you should Is there any way to use string stored in variable as a column name in a new data frame? The expected result should be: col. Reference General reference Object identifiers Literals and variables as identifiers Literals and variables as identifiers¶. We can convert a string to variable name in Python using the following functions. Improve this question. The issue was that I wanted to create an unknown number of things and so I couldn’t name the variables foo_1 through foo_n, but I can name the nodes and use add_child(foo, true) to set the name in the tree then use get_node to get a named node in the tree. i. While Python does not directly allow you to convert a string into a I have any string. Part of that means using a string contained in a variable as the property name of a nested object. awt. How should I do that (in python)? Is it possible to use a string as a name of a variable? For Example. Hot Network Questions What distinction is Paul making between ἀπὸ θεοῦ and ἀπὸ τοῦ θεοῦ? I've created cell full of string variables: X{1,1} = 'TEST1A1' X{2,1} = 'TEST1A2' X{3,1} = 'TEST1A3' X{120,1} = 'TEST8C5' Each of them represent set of data from an experiment. data. For example, I want to subset data to 4-cyl cars. The reason for wanting to name each object is so I can call on the specifically later, and create multiple objects using the same statement. symbol() If I add code to manipulate the data frame using dplyr it I have any string. I saw security warnings about the use of eval() but I gess it's OK since the evaluated variable doesn't come from user input. How to use variable in variable name. dat <- data. isidentifier() in combination with filter(). Namespace. How to use reference variables by character string in a formula? 0. The solution is to use your own hash or a real Instead of converting the variable name into a string, I convert a string into a variable. Just set a "name" property on the Player object. This is the code that does NOT work: They are to add colors and color codes to a vendor table when entering a new style. if I know the field name then it works fine, like Not an answer I know as I would steer clear of using reserved words as variable names, but if you insist then at least use the following: private string lat; private string @long; public string Lat { get { return this. static final Map<String, Integer> VALUES_BY_NAME; static { final Map<String, Integer> valuesByName = new HashMap<>(); valuesByName. Or a type name for that matter. It means that we have assigned an integer value to a string with the help of the assignment operator =. The code below goes through the textbox controls on the form and gets the control's name and value fine. Also note that a variable is just a reference to an object; it is not "the name of the object" (there might actually be many variables that reference the same object). Using reflection doesn't seem like a good design for what you're doing here. If you have variable of different types, solution exists, as in boost::variant Java Variable Binding 7 ; c++ palindrome problem 8 ; java. With the latest dplyr version you can use the syntax from the glue package when naming parameters when using :=. var1="this is the real value" a="var1" echo "${!a}" # outputs 'this is the real value' This is an example of indirect parameter expansion:. Vote. Is it possible to use a variable as a string indice in Python? 4. Learn more about char, variable, bad idea, anti-pattern, antipattern, slow, inefficient . Modified 9 I sort of understand what you're trying to do. I want to use the value of a variable to access an object. I want to create a new variable named "omega" (assume double type) using the string "omega". lat; } } public string Long { get { return this. Why do you want to use global variables? – PeterKA problem is, it sends string instead of the texture data. That's handy, but you can't pass an expression as the key word. myVar, but is there a way to create the same variable using string for the variable name?Something like: const str = "myVar"; this[str] = "Value"; // the result should be the similar as this. Value; System. You need string to access objects, variable names never comes in. Typically, this would restrict you to a single type, I have a variable that has a pin number assigned to it . Executing mutate() using a string using dplyr 0. The best thing you can do is create a dictionary and use keys instead of variable names. As a collection of variables you have the array/list arrangements that can be First, I extract the variable name and value from the original string and convert the value to numeric class. For example: // There may already be a field for this somewhere in the framework private static readonly object[] EmptyArray = new object[0]; Note: do not use eval in any case where you are getting the name to look up from user entered input. for example: "Hello" should be converted as const char* Hello; by using a macro. name = 'varname' value = 'something' setattr(self, name, value) #equivalent to: self. Link. Here is how you can do it: Create a string containing the desired variable name. maxdec maxdec. felixdacat. If the first character of parameter is an exclamation point (!), it introduces a level of variable indirection. 0. How can I check if a program exists from a Bash script? 3621. Commented Oct 1, 2008 at 18:40. 2. Ask Question Asked 7 years, 1 month ago. Parameter expansion is not recursive, therefore the text ${a_${v}} is really The contents of the variable whose name is 'a_${v}', and the shell complains that this variable name is not valid. So I'm grabbing a JSON via AJAX, but need to re-configure it. My problem is how how can I use tha string as the variable name. Does anyone know a way I can fetch the value of a variable by using its name, for example: You can use an associative container as a std::map< std::string, your_variable_type > to link a string to a variable, assuming they are all of the same type. items(): df. NET - How to add variable in string. Modified 5 years ago. Here, we are utilizing a method that takes the name of the variable and the value to change it to - then passing it to the current vue model instance (represented by this inside of methods) to modify the value of the dynamic variable name. #define Reflect_Value(name,t) \ namespace Reflection { \ static ReflectedObject object_##name = ReflectedObject(name,t); }\ now the macro would then take that first parameter and be used as object_TestStringName By using the get() function within the filter() function, we’re able to successfully filter the rows in the data frame for only the rows where team is equal to A. You can use the built in func:str. For example if you have source data in NAME, VALUE pairs then you can use PROC TRANSPOSE to convert the data into variable using the value of NAME as the name of the variable and VALUE as the value for the variable. 57. variables are for programmers reading and writing source code, they shouldn't be considered program data. 3 every dplyr function using non standard evaluation (NSE, see release post and vignette) has a standard evaluation (SE) twin ending in an underscore. I have a variable that has a pin number assigned to it . Learn more about structures, string . See also the FAQ How can I use a variable as a variable name? As the answer to the FAQ notes, if the variables are not indexed by an integer, you can use a hash table: By using symbolic references, you are just using the package's symbol-table hash (like %main::) instead of a user-defined hash. e the new variable omega should be able to hold numerical values (eg I’m trying to make a script that I could use in multiple situations where I could set strings into variables. Use a Vector? name[1], name[2] etc. Use variables from formula in R function. EDIT: Or a Dict. Viewed 7k times 3 . But ı dont have got the number of user , so i can not code to infinite. So I want to generate "vari1", "vari2", "vari3" and so on. @Flyphe -- it's absolutely possible to make a program that changes what it does based on the input; it's not possible to make a program that creates new names for data while the program runs. to_sql(name, db) If there is a logical rule that relates the input filename to the one that should be used for the to_sql call, you can use a dict comprehension to build the dict: dfs = {to_sql_name(csv_name): pd. data[[dateIn]], evaluates to . next page → What you are wanting is what the Smalltalk Language had used in it's Interpreter in the 1980;s and what Python still uses to create Object Variables from string char's through a TTY Command Shell Program in C language. This is much better than the indirection over the conversion to a If I say the 'name of the object', I mean 'the name of the variable pointing to the object'. naming variables from string. If the class that we need to instance is in the same file, we can use something like this: # Get class from globals and create an instance m = globals()['our_class']() # Get the function (from the instance) that we need to call func = getattr(m, 'function_name') # Call it func() How to convert string to variable name ?. It will, in turn, assign columns with the names of the key words. varname) #will print 'something' But, since you should inform an object to receive the new variable, this only works inside classes or In this article, we’ll explore how to convert a string into a variable name in Python with four simple examples. Ask Question Asked 11 years, 11 months ago. functionName", window), there's no way to get this to refer to the same thing. when hh is printed, it displays: _1_1_cell. Here are two helpful posts I found: Creating a variable name using a String value & To use a string value as a variable name – CubeJockey. There's very little to be gained by being able to reference a variable using another variable that contains an ASCII string. Follow Maybe using a variable more than once in the string would be more demonstrative. Commented Nov 19, 2014 at 18:18. For example, if this comes from a web page, there is nothing preventing anyone from entering: __import__("os"). Reflection. std::unordered_map provides the same behavior that a dictionary provides in some other languages. You can use the [] syntax to use an expression as the property name (compared to the . This requires no imports such as re and works by iterating over each character and returning it if its an identifier. frame(v1 = As others mentioned, in PHP5 (and also in newer versions like PHP7) we could use variables as function names, use call_user_func() and call_user_func_array(), etc. Variable names are a compile-time construct. Do not hide indices in the names of variables, but use indices instead: Let Indiv_Reg be a cell array and use the numerical value as index. I answered that accurately. Namespace object. Barring various hacks and tricks, the way to do this correctly is to group the data that you want together using the appropriate data structure. Add("filename2_" + key, "Value"); If your keys are always numeric, you can also use an array or a List. You need to put % name straight after the string: f = open('%s. My variablename() function searches through that list to find the variable name(s) that corresponds to the value of the variable whose name I need in string form. How to concatenate PHP variable name? 1. Using a variables string value in variable name. Another way to pass a string as a variable name to the filter() function in dplyr is to use the . g. name() / as. You can use setattr. Now I need to list the values for each of the fields stored in the schFields array. net-3. Value is of type String) String method_name = String. substring(Math. Follow answered Jun 11, 2013 at 8:26. Here goes with some example data. Example: var objname = 'myobject'; {objname}. Python has powerful tools and data structures, use them instead. like 'buffalo', x='buffalo' I want to convert this string to some variable name like, buffalo=4 not only this example, I want to convert any input string to some variable name. Check To use a string value as a variable name for more details. I want my programm to check and use variable name that is in string. What are you actually trying to do? There's probably a much better way to do it in Java than what you're trying to do. There are various approaches here, you could use a dict that maps I would like to write a unique function to (among other things) filter a database for different variables at different threshold. pfet pwqphozzi xhxymk lafq zrlln tiissw efed pezivwr btsz wssm