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How to store output of a for loop in a matrix?

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Hi guys,
I'm having difficulty storing my output values from a loop into a matrix. And whenever I try the solution mentioned in other examples the error preallocate comes up.
My code is below:
P= [10 20 30]
A=1230
B=0.14
Idir=0
for index = 1:3
Idir=(A/(exp(B/sin(P(index)))))
end

Accepted Answer

madhan ravi
madhan ravi on 18 Feb 2019
Idir=zeros(size(P)); % this is how you preallocate before loop
Note: In this case you don’t need a loop.
  5 Comments
Jamil Dudhwala
Jamil Dudhwala on 18 Feb 2019
Thank you, that worked.
But in that case, in MATLAB, when should for loops be used?
madhan ravi
madhan ravi on 18 Feb 2019
Definitely I would suggest you to read the link suggested by stephen , once if you get familiarized with all the functions then you will know
When to use it ?
How to use it ?
Where to use it ?

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