What does the function 'ones' do to a matrix when trying to load an image?
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GandaBerunda on 8 Jul 2022
ones() returns an array or a matrix all the elements of which are the number 1. In your case, it will return a 91x109 int8 array all of whose elements are 1, which will be stored in BrainImage.
More Answers (1)
Image Analyst on 9 Jul 2022
If you don't, and you just do
BrainImage(:,:) = aalAtlas.tissue(:, :, 50)
then, since ":" means "all" it will try to take the 50th slice and put it into BrainImage. The problem is that since you used : it means 1:end but it doesn't know the size of BrainImage yet so it throws an error with that syntax. It would have worked if you just didn't try to reference any row and column range, like this:
BrainImage = aalAtlas.tissue(:, :, 50)