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Calculation the mean of a portion of a matrix

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I am having trouble finding out how can I calculate the mean of all the values in a 10x10 matrix (z) which do not lie along an edge of that same matrix (z)...
Thanks in advance!

Accepted Answer

Matt J
Matt J on 23 Feb 2021
Edited: Matt J on 23 Feb 2021
mean( z(2:end-1,2:end-1) ,'all')

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