MATLAB: Looping to create multiple variables

bad ideafor loopMATLABmultipleno it's a horrible ideavariables

I would like to run the following code 50 times, each time saving the output into a new variable (eg. s1, s2, s3,…,s50)

   s = [reshape(randperm(32),[],1),randi(8,32,1)];

How would I do that?

Thank you! (sorry if this is a very trivial question, I'm new)

Best Answer

Don't create such variables, read here to know why

https://www.mathworks.com/matlabcentral/answers/57445-faq-how-can-i-create-variables-a1-a2-a10-in-a-loop

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

instead, do something like this,

for k = 1:50
    s(:,:,k) = [reshape(randperm(32),[],1),randi(8,32,1)];
end

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MATLAB: How to generate pair of numbers from sequence

kitty - you could try using reshape to create a 50x2 matrix of pairs

a = reshape(randperm(100), [50 2])

MATLAB: How to change struct name in a loop

Although there is a MATLAB function to do this, but it is a very bad practice to name your variables like this. It will make your code error prone and hard to debug. Therefore I am going to suggest the correct way to solve the problem. You should create a struct array and store the input number as a field of the struct. For example

for ii=1:10
  X = input('which individual? ');
  s(i).individualNumber = X;
  s(i).length = ...;
end

It will take 10 inputs from user and store them in struct array.

Best Answer

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