Basic question about loops

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Pelajar UM
Pelajar UM on 29 Oct 2021
Commented: Stephen23 on 31 Oct 2021
Very basic question: why is this not working?
instead of
Idx2=Idx(:,2)
Idx3=Idx(:,3)
Idx4=Idx(:,4)
Idx5=Idx(:,5)
I wrote
for i=2:5
Idx(i)=Idx(:,i)
end
The error is: Unable to perform assignment because the left and right sides have a different number of elements.
  10 Comments
Stephen23
Stephen23 on 31 Oct 2021
"Small error: your code mixes k and i"
Fixed, thank you!
If the content of C are of suitable sizes then after the loop you could concatenate them back into one array, e.g.:
A = cat(3,C{:})

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Accepted Answer

millercommamatt
millercommamatt on 29 Oct 2021
You could make use of genvarname, but this would work too.
for i = 2:5
eval(['Idx' num2str(i) ' = Idx(:,' num2str(i) ');']);
end
When you start using functions like genvarname and eval, it's usually a sign that you should be approaching your task in a different way.
  4 Comments
Stephen23
Stephen23 on 29 Oct 2021
"Yes, this is exactly what I wanted"
and is a slow, complex, inefficient, obfuscated approach this task.

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