having trouble with changing Matrix name

I want to name my outputs A_10_1, A-10_2,..., A_10_n; A_20_1, A_20_2,...,A_m_n; Where output A_m_n was generated with variable m and it is nth replication result.

Please help me to write code thanks

[Stephen23]

Your terminology is not clear because you are mixing the terms file and variable. Are you talking about a file of data that is saved on a hard-drive, or a variable (e.g. a matrix) that is inside MATLAB's workspace?

Answer 1

[Thorsten]

You can store matrices of different sizes in a cell array:

 for m=1:Nm
   for n=1:Nn
     A{m,n} = myfunction(m,n);
   end
 end

Answer 2

[Image Analyst]

See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

In short, to create a filename from two integers, do this

for m = 1 : whateverM
    for n = 1 : whateverN
       filename = sprintf('A_%d_%d.dat', m, n);
    end
end

[Razieh]

My file 'call it Z, for example' is a matrix that I want to save it with its values with this new name. However, when I use the above code the matrix is deleted and replaced with characters that are stated in sprintf.

How I keep the matrix but only change its name? by the way m and n are supplied by function call and represent input [output]=function F(m,n)

[Guillaume]

Files and matrices are two completely different things. It helps if you use the proper terminology.

DO NOT create matrices with dynamic names such as A_10_1. Instead use a single cell array or if all these matrices are the same size a higher dimension matrix.

[Image Analyst]

As Guillaume, Stephen, and now me (now that I know you want to create matrices and not filenames like you said in the subject line) all say, this is a bad idea and we recommend you read the FAQ to learn why. It's better if you just use functions to process the same named variable, within a loop to handle the 16 different cases where the array has different values, OR use a larger array so that all of your 16 arrays can be in the same single array, and you just get to them by changing the index.

[Razieh]

ok. thanks Image Analyst for the suggestion. I try to learn that

Answer 3

[Stephen23]

https://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

[Jan]

@Razieh: Please follow the links Stephen has posted. The topic of numbered names of variables has been discussed thousands of times before and this is a severely bad method of beginners. The solution is easy: NEVER hide indices in the names of variables, but use arrays instead.

[Razieh]

Thanks Jan Simon