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Flip matrix by every nth row

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David du Preez
David du Preez 2017-4-12
编辑： Stephen23 2017-4-12
I have a 121x14 matrix. I want to flip the first 11 rows vertically and repeat so on for the rest of the matrix. I know it is possible to flip an entire matrix using:
flipup(name)

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Stephen23
Stephen23 2017-4-12
编辑：Stephen23 2017-4-12
This is MATLAB, so just generate the indices:
idx = reshape(flipud(reshape(1:121,11,11)),1,121);
mat(idx,:)
These indices only need to be generated once, and can be used multiple times.

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