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How to set values to NaN when they AREN'T within the given indices

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Hello,
I am attempting to set several values in a large matrix to NaN based on indices that I do not want to have NaN values. I attempted using logicals but matlab doesn't change anything (see photo). In this example, I expect every value but the bottom right to be set equal to NaN. I checked previous posts and this was how it was done in 2014.

Answers (1)

Jonas
Jonas on 17 Jul 2021
a=ones(3);
[X,Y]=meshgrid(1:3);
a(~(X==3 & Y==3))=NaN;
which equals
a(X~=3 | Y~=3)=NaN;
  4 Comments
Simon Chan
Simon Chan on 17 Jul 2021
If there is an original matrix contains different values and you want to keep part of it, you may try the following:
DataKeep = matrix_original(yind(1):yind(end),xind(1):xind(end),:); % Keep the data from the original matrix
[n,m,k] = size(matrix_original); % k should be 1000 in your case
matrix=nan(n,m,k); % Create a new matrix with NaN only
matrix(yind(1):yind(end),xind(1):xind(end),:)=DataKeep; % Put the data you want to keep in the new matrix

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