MATLAB: Find negative in every n rows

matrixnegative

I have a 2184 x 14 matrix. In column 1 is the datenum value and in column 14 the values that I want to consider. The other columns contain some other data.
I want to consider the first 24rows if any of the values in column 14 are negative. I want to delete the first 24rows and then repeat this for the following 24rows.

Best Answer

One way
% A - your data [2184 x 14]
ii = ceil((1:size(A,1))'/24);
jj = accumarray(ii,A(:,14),[],@(x)all(x >= 0)); % EDIT
out = A(jj(ii),:);
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