Strings Strings variables are primarily used for labeling output and passing the names of m-files as arguments to other functions. Suever. Forcing meta-data into variable names makes accessing that meta-data much slower and more complex. Can you explain to me how to preallocate the struct if i know i = 1:750 and will need 3 variables ('name', 'x_axis', 'y_axis') please. If you wanted, for example, to read multiple files which include field names and values, and have their content stored in structs with these field names, you could create a cell array of structs indexed by a file ID if field names could vary among files, or a struct array if fields would be similar among files. . In this class I have a variable named "car". The MATLAB documentation specifically warns against accessing variable names dynamically: Like this: I have a variable called "Headings", inside it is a bunch of text [time, speed, distance]. If you want to create variables programmatically (not a recommended practice, but if you insist), see the previous question: A way to dynamically create variables in Matlab?. Many beginners in programming struggle with the problem of hiding indices in the names of variables, because they do not have enough experiences with the efficient using of arrays. As I say, it's messy to do that, and at least you may want to have things stored within a structure, which allows programmatic creation of elements using string variables and dynamic referencing using the paren syntax. I want to name a variable using values of other variables given in a function. Essentially I want loop through the array of names, A, and create a MyClass object for each member. Basically I just want so save code lines by creating these variables in an automated way. Essentially I want loop through the array of names, A, and create a MyClass object for each member. For reasons beyond my understanding, TMW in their infinite wisdom decided to name the columns of a table as "variables", which is the same name used for arrays stored in the MATLAB workspace.Confusion arises when these two totally different concepts are mixed up, as in your question: GENVARNAME and MAKEVALIDNAME apply to names of workspace variables (and a few other situations), but given that . The program is about 20 min to run to finish (combination of loading files, creating png's and a slow computer). MATLAB provides a rich set of functions to work with string arrays. Accepted Answer: Stephen. The MATLAB documentation specifically warns against accessing variable names dynamically: How do you a string in a variable as a name for another variable? The exclusions input can be a string, a string array, a character array, a cell array of character vectors. The pattern in my example would be ["x", num2str(i)]. This should result in the objects objA, objB and objC.. classdef MyClass properties something name end methods . Can you explain to me how to preallocate the struct if i know i = 1:750 and will need 3 variables ('name', 'x_axis', 'y_axis') please. You will have to use eval or another function (e.g. You need to put the string inside of square brackets to concatenate it first, just like I did. varName = matlab.lang.makeValidName('123your.string(1)') PS: this will only modify your string so that it becomes a valid variable name, if it isn't already. @Vladislav Kargin: Exactly. It shows a number of different alternatives to creating a variable from a string, recommending strongly that you use one of the alternatives instead of creating a variable dynamically. Share. varname = genvarname(str, exclusions) returns a valid variable name that is different from any name listed in the exclusions input. Say there is a cell array . For my part: I have a signal that I have to cut into several windows, for each window I have to calculate values (5 values . So you will extract S0(1189:100*12,:)) and S1(1090:100*11, :) and concatenate them together. Learn more about mkdir loop l iteration variable name . The inclusion of meta-data within variable names or fieldnames (e.g. If you try to make a variable name from a MATLAB keyword, genvarname creates a variable name that capitalizes the keyword and precedes it with the letter x: v = genvarname ('global') v = xGlobal Example 6 This is a simplified version of what I'm intending to do. Unexpected MATLAB expression._** . While strings are not usually thought of as fundamental to numerical analysis, strings can add a degree of flexibility and polish to your MATLAB code. The exclusions input can be a string, a string array, a character array, a cell array of character vectors. mkdir with variable name. Matlab is a tool and you can use it the wrong way. The last iteration of i will be i = 1189 . For my part: I have a signal that I have to cut into several windows, for each window I have to calculate values (5 values . So in effect, in the end I have: time = [1 . As long as the file is included on the MATLAB path, you can use the function in the following way: Splitting changes names from a 5-by-1 string array to a 5-by-2 array. . A = {'objA', 'objB', 'objC'} I want to have its members as instances of MyClass (see below) in Matlab. Split, Join, and Sort String Array. @Vladislav Kargin: Exactly. I want to create string of characters from variable name And use it as a name of an excel file. Follow edited Mar 29 '17 at 19:36. I wrote a code as (below), why matlab returns results that i don't want. Yes, It's very kind of you. Thank you so much. Many beginners in programming struggle with the problem of hiding indices in the names of variables, because they do not have enough experiences with the efficient using of arrays. Using this, you can create a short function that, given a variable, will output the name of it as a string, as in the following example: function out = getVarName(var) out = inputname(1) ;end. assignin, mentioned in an earlier answer) to utilise this variable name. 7 Rather than . string matlab variables struct matlab-struct. At the end of the FAQ it shows how to create a variable dynamically, for the rare case when you really need to do that. So, if I have values for an x1,x2 I can make the new variable's name as: x_(x1's value)_(x2's value) as a name. Headings = [time, speed, distance] Now, I want to have a variable that uses the text inside "Headings" as its name with 1,2,3,4 inside. Detail, I received a variable "eval" that has size is (1x77) and, only end value of eval is equal to 5. Add a comment | 1 Answer Active Oldest Votes. But again, dynamically building variable names is rarely legitimate. Why?, I want to m1 = 1, m2 = 5 It's easy to create a single string but I want to write a function that generalizes this situation. To answer the question completely, The target is to use the strings from the first array as variable names and the strings from the other array as values in form of string. 62 . MATLAB documentation has detailed examples of using this function with an exclusion list (for ensuring unique variable names). Is there the possibility to construct a variable name in Matlab? Matlab is a tool and you can use it the wrong way. Creating and accessing variable names dynamically makes your code slow, buggy, hard to debug, and hard to read. Like this: I have a variable called "Headings", inside it is a bunch of text [time, speed, distance]. But I want these variables to remain in the "time" class. I couldn't get genvarname or eval to work for this.. But, because i want to make a general problem. Skip to content. How do you a string in a variable as a name for another variable? But I cant find a way to create a variable with that name. Jul 19 '16 at 15:09. Using this, you can create a short function that, given a variable, will output the name of it as a string, as in the following example: function out = getVarName(var) out = inputname(1) ;end. Matlab Code: Matrix . eval([SUB ' = struct']) will create a struct variable whose name is the content of SUB. The program is about 20 min to run to finish (combination of loading files, creating png's and a slow computer). Specify the function who in exclusions to create a variable name that will be unique in the current MATLAB . This should result in the objects objA, objB and objC.. classdef MyClass properties something name end methods . The exclusions input can be a string, a string array, a character array, a cell array of character vectors. If you try to make a variable name from a MATLAB keyword, genvarname creates a variable name that capitalizes the keyword and precedes it with the letter x: v = genvarname ('global') v = xGlobal Example 6 >> a=['matlab','is','fun'] a = matlabisfun >> size(a) ans = 1 11 In a character array, each character in a string counts as one element, which explains why the size of a is 1X11. Basically I just want so save code lines by creating these variables in an automated way. If you wanted, for example, to read multiple files which include field names and values, and have their content stored in structs with these field names, you could create a cell array of structs indexed by a file ID if field names could vary among files, or a struct array if fields would be similar among files. Say there is a cell array . This is a simplified version of what I'm intending to do. varname = genvarname(str, exclusions) returns a valid variable name that is different from any name listed in the exclusions input. A = {'objA', 'objB', 'objC'} I want to have its members as instances of MyClass (see below) in Matlab. Accepted Answer: Stephen. It's easy to create a single string but I want to write a function that generalizes this situation. N = matlab.lang.makeValidName(S) constructs valid MATLAB ® identifiers, N, from input strings, S.The makeValidName function does not guarantee the strings in N are unique.. A valid MATLAB identifier is a character vector of alphanumerics (A-Z, a-z, 0-9) and underscores, such that the first character is a letter and the length of the character vector is less than or equal to namelengthmax. MATLAB: How can I use a variables value in another variables name? I couldn't get genvarname or eval to work for this.. I've checked out the eval, num2str, strcat functions, but as of yet I can't make it so . But I cant find a way to create a variable with that name. To store strings of varying lengths as elements of an array, you need to use curly braces to save as a cell array. Headings = [time, speed, distance] Now, I want to have a variable that uses the text inside "Headings" as its name with 1,2,3,4 inside. So in effect, in the end I have: time = [1 . is the basic syntax for use. To create a new variable, enter the variable name in the Command Window, followed by an equal sign (=) and the value you want to assign to the variable. I want to create string of characters from variable name And use it as a name of an excel file. Sign in to comment. Specify the function who in exclusions to create a variable name that will be unique in the current MATLAB . It pops a warning and suggest to preallocate for speed. The pattern in my example would be ["x", num2str(i)]. As I say, it's messy to do that, and at least you may want to have things stored within a structure, which allows programmatic creation of elements using string variables and dynamic referencing using the paren syntax. Specify the function who in exclusions to create a variable name that will be unique in the current MATLAB . If you want to create variables programmatically (not a recommended practice, but if you insist), see the previous question: A way to dynamically create variables in Matlab?. In my Matlab program, I have a class named "time". 0 Comments naming a variable with the user's input, or more commonly trying to include an index in a variable name) is more subtle, but is also a poor programming practice. Many beginners in programming struggle with the problem of hiding indices in the names of variables, because they do not have enough experiences with the efficient using of arrays. For example, you can use the split, join, and sort functions to rearrange the string array names so that the names are in alphabetical order by last name.. Split names on the space characters. This means to assign first string from the other array to the first string from the first array and the second string from the other array to the second string from first array.
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