Create an Matrix of Variables from a String input

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Surafel Taddesse 2019-7-18

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https://ww2.mathworks.cn/matlabcentral/answers/472398-create-an-matrix-of-variables-from-a-string-input

回答： Mario Chiappelli 2019-7-19

I'm not sure if I'm even asking the question the correct way, however, heres what I'm trying to accomplish,

I'm working on a Matlab Application:

I have an 8 x 10 matrix with a set of numbers. I also have an 8 x 10 matrix of variables A1 - H10. I've done this because I want the app to recall a digit everytime a variable is raised. The numbers in the matrix are results of compultations so they might vary case by case.

I want the user to be able to recall variables and graph them as needed.

x_var = [get(app.xvar,'value'),get(app.xvar2,'value'),get(app.xvar3,'value'),get(app.xvar4,'value')]   
 % These are just the numbers so they're easy enough to retrieve, 
 % As an example, one input was x_var = [2 4 6 8] 
y_var = [get(app.yvar,'value'),get(app.yvar2,'value'),get(app.yvar3,'value'),get(app.yvar4,'value')]
% for this however I get an outcome like so y_var = 'A1D4G6H9'
% I wanted to get y_var = [A1,D4,G6,H9] 

How can I fix my issue.

Any help is appriciated.

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Jan 2019-7-19

What does this mean: "8 x 10 matrix of variables A1 - H10"?

This is not clear to me also: "I want the app to recall a digit everytime a variable is raised"

Accessing the names of variables dynamically is a very bad idea. See TUTORIAL: Why and how to avoid Eval

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Answer 1

Mario Chiappelli 2019-7-19

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I don't quite understand what you are asking, but if you problem is with getting the cells of the y_var to be separate instead of concatenated you can try the following:

y_var = string(4);
for i = 1:4
    y_var(i) = get(app.yvar(i),'value')
end

You also need to stop writing variable names dynamically and instead store your values into arrays.

I changed your variable "yvar" to an array and the for loop will iterate through each element of "yvar".

This code is merely a skeleton of how you should be thinking of solving the problem. If you included more of your code, then we could have wrote more to help.