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For loop not saving answers into matrix.

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Hi all,
I'm sure I've done something silly, but I can't work out why my code isn't working. Hopefully a fresh pair of eyes will help.
I'm trying to perform a moving correlation by specifying the index locations within a matrix for the correlation to be performed on. This then cycles through the for loop to give me answers for my whole matrix.
BUT! It's not saving each value into my specified matrix, and my output (MIChinacorr) is just a NaN matrix.
I know that the corr code works, because when I manually say k=1, I get an answer.
What am I doing wrong?
%Select moving window
window_size=10; %for an 11 point window
%Perform Correlation
for k=2:389
Thanks for your help.

Accepted Answer

Walter Roberson
Walter Roberson on 9 Jan 2013
Every iteration of the "for k" loop, you are assigning
so you are overwriting all of MiChinacorr with NaN.
You should only initialize it once, before the loop.
  1 Comment
Claire on 9 Jan 2013
That's it! I knew I was doing something silly, I just couldn't see it.
Thanks so much for your help. Claire.

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More Answers (1)

Roger Stafford
Roger Stafford on 9 Jan 2013
If you wrote the code just as you show it, you would need to add an ellipsis after the equal sign:
MIChinacorr(k,1)= ...


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