How to save a matrix data with a concatenated variable name?

I have an application to name the output data with concatenated variable name.

a={'PrimSpeed','SecSpeed'};
for i=1:length(a)    
    ['FFT_' a{i}]=abs(fft(V(IS:Ns)))/Ns1;     
end

The output data need to be saved in FFT_PrimSpeed.

[Stephen23]

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

Answer 1

[Stephen23]

It is simpler and more efficient to use a structure:

C = {'PrimSpeed','SecSpeed'};
S = struct();
for k = 1:numel(C)    
    S.(C{k}) = abs(fft(V(IS:Ns)))/Ns1;     
end

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

Even better would be to just use basic indexing.