Accessing the data in MATRIX based on condition
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I have a 9000 by one Matrix.As an Example considering the following
X Y Z P
5 5 5 900
5 5 10 800
5 5 15 1200
5 10 5 300
5 10 10 560
5 10 15 900
I want compute average P at each Y, that means all values of P when Y is 5.Similary when y is 10....It is just a example.Next x goes to 10 and same varies
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Walter Roberson
le 8 Oct 2020
Modifié(e) : Walter Roberson
le 8 Oct 2020
findgroups() and then splitapply()
However, if your array is as regular as it looks, you should probably just reshape and mean() along the appropriate plane (you might need a permute() in there, and maybe two rounds of reshape())
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