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Removing data below a polysurface threshold

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Si Cla
Si Cla 2016-9-30
关闭： MATLAB Answer Bot 2021-8-20
I have a matrix (XYZ) with which I want to remove data above a certain threshold. The threshold is set by a polysurface. How can I use a polysurface as this threshold?
I don't think this is possible using logical indexing (from by newbie knowledge!) I'm thinking of creating a new matrix (A) by selecting data below the polysurface using something similar to:
if (z(i) < y(%polysurface function%)
then z(i) = A
Is there a better way to do this? Currently I'm still working on a code that's workable!
Thanks!

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