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matlabmatrix3dintervalsmin
bRiocHe
bRiocHe

Reputation: 37

Min / Max of 3d Matrix using different intervals Matlab

I have a 3d matrix A of size MxNxZ. I am searching the minimum for each vector in the Z direction like this.

I = min(A(:, :, minInterval : maxInterval), [], 3);

This is working.

Now I want to have variable intervals for each vector. I have then two 2d matrices as follow :

minIntervals of size MxN
maxIntervals of size MxN

I am then trying this :

I = min(A(:, :, minIntervals : maxIntervals), [], 3);

but it did not work and use only minIntervals(1,1) and maxIntervals(1,1).

Do you have an idea, I don't want to use loop because of the size of the data.

Thank you very much.

Upvotes: 2

Views: 89

Answers (1)

rahnema1
rahnema1

Reputation: 15867

You can set matrix values that are outside the interval to Inf and take the min :

In MATLAB r2016b and later:

z=reshape(1:size(A,3),1,1,[]);
A(z<minInterval | z>maxInterval)=Inf;
I=min(A,[],3);

In pre r2016b:

z=reshape(1:size(A,3),1,1,[]);
A(bsxfun(@lt, z, minInterval) | bsxfun(@gt, z,maxInterval))=Inf;
I=min(A,[],3);

Upvotes: 2

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