MATLAB: I have a question regarding changing variable names in a loop.

changing variable names in loops

I have the following code:

i=linspace(25,100,4); for x=1:4; cd 'C:\Users\somrsz\Documents\TID\raw data from sea trials april 2016\Matlabformulas' [eval(['Spectrum_numstr(x)'=i;]),~,~]=fft_BW_V3(Info,1/2000,2^15,100,0.001,0); cd 'C:\Users\somrsz\Documents\TID\raw data from sea trials april 2016\waterfall plots' end

Basically what I am trying to do is get the spectrum output of the function fft_BW_V3 to be: Spectrum_25, Spectrum_50, Spectrum_75 … etc… any ideas are much appreciated!

Thanks!

Best Answer

for i = 0:25:100
str = strcat('spectrum','_',num2str(i)) ;
disp(str)
end

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Do NOT do this

This would actually be horribly slow, pointlessly complex, obfuscated, and very buggy way to write your code. You would make your code hard to debug, and a pain to work with. Read this to know why:

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

Using indexing would be simple, neat, and very efficient. You should use one array and indexing. Indexing is the solution you should be using, because it is the most efficient way to write MATLAB code, is simple, neat, and very easy to debug. Indexing is explained quite well in the MATLAB introductory tutorials, which are highly recommended for all beginners:

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

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