CODEWITHSUNDEEP
matlabfor-loopmatrixaddition
SkippyNBS
SkippyNBS

Reputation: 777

For Loop Matrix Error

I am writing some Matlab code to analyze spikes and their stimuli. In the first part of the code I get the timing of a spike and then find the frame that was shown on the screen just prior. I then want to take the image data from that frame and add it to my own movie data. The x and y components of myMovie and moviedata are both 128x128, however when I try to add the image values from a certain frame from the stimuli moviedata(:,:,j) to a specific frame in my movie myMovie(:,:,k) I get "error: matrix dimensions must agree". Is there any way to fix this?

Code:

for n=1:1100

   t = blocks(5).spikes{1}(:,n);

   for k=1:25
       ind = find(round(double(blocks(5).frameEpocs*1000)/1000) == (t-(1/(25*10))));
       j = blocks(5).frameEpocs(1,ind);
       myMovie(:,:,k) = myMovie(:,:,k) + double(moviedata(:,:,j));
   end

end

Upvotes: 0

Views: 61

Answers (1)

ThP
ThP

Reputation: 2342

find may return an empty matrix and hence j would be empty as well.
In that case, the command myMovie(:,:,k) + double(moviedata(:,:,j)); attempts to add a 128x128x1 matrix with a 128x128x0 matrix and thus the error you got.

Upvotes: 2

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