How to dynamically name variables in a matlab struct?

Hi everyone.

I need to create a 'struct' to save some datas.

This datas refers to results of solve 28 problems using 10 differents algorithms each one being executed 100 times. To simplify, let suppose the I have 4 problems and 3 algorithms. I need to find a way to dynamically name all the variable of the struct. So I try to make a code like this:

for i=1:3
    algor = {@alg1,@alg2,@alg3}
    algor2 = ['alg1','alg2','alg3']
    probl = {@prob1,@prob2,@prob3,@prob4}
    probl2 = ['prob1','prob2','prob3','prob4']
    for j=1:4
        for k=1:100
            [M,jM] = algor{i}(probl{j}); % I know that this line is okay!
            dataM(k).(algor2{i}).(probl2{j}) = M(end).mem; % I think my problems are in "algor2{i}" and/or in "probl2{j}"
            datajM(k).(algor2{i}).(probl2{j}) = jM(end).mem;
        end
        save('dataM.mat','dataM');
        save('datajM.mat','datajM');
    end
end

My doubt is:

1) there is a way to transform 'algor' in 'algor2' (and 'probl' in 'probl2') in a different way that I did?

2) about 'dataM(k).(algor2{i}).(probl2{j}) = M(end).mem' (and datajM(k).(algor2{i}).(probl2{j}) = jM(end).mem) I received the error mesage:

Brace indexing is not supported for variables of this type.
Error in main (line 40)
		dataM(k).(algor2{i}).(probl2{j}) = M(end).mem;

So, what am I doing wrong? How to do it in the right way?

See that, what I am trying to do in 2) is dynamically name the variable in a struct. I need the variable name in the format "dataM.alg1.prob1".

Thank you for your help!

[Stephen23]

Note that those are field names, not variable names. The structure itself is a variable, and the structure has fields (which is what your question actually refers to). Structure field names can be generated or accessed dynamically:

https://www.mathworks.com/help/matlab/structures.html

https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html

Accessing variable names is not recommended:

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

Answer 1

[Luna]

You are almost there.

Define your algor2 and probl2 as cell arrays with braces:

algor2 = {'alg1','alg2','alg3'}
probl2 = {'prob1','prob2','prob3','prob4'}

[ELCIO S]

Thank you. It works!

[Luna]

Your welcome :)