Sum of defined portion of a 3D matrix

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Matt 2015-9-22

评论： Stephen23 2015-9-22

Hello,

I would like to sum different layers of a 3D matrix, but I don't know an easy way of doing it. Basically what I would like to do is this:

matrix1=sum(timematrix(:,:,1:3))

"timematrix" is a 1x1000x5 matrix and I would like to compute the sum of the first 3 layers. Using the following command works:

matrix1=timematrix(:,:,1)+timematrix(:,:,2)+timematrix(:,:,3)

Thanks in advance!

Walter Roberson 2015-9-22

matrix1 = sum(timematrix(:,:,1:3), 3);

Stephen23 2015-9-22

This is explained perfectly in the documentation:

MATLAB Language Fundamentals Matrices and Arrays Matrix Indexing

在 Help Center 和 File Exchange 中查找有关 Matrix Indexing 的更多信息

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