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Mean based on positive and negative values of a field

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SS
SS on 29 Aug 2019
Commented: SS on 30 Aug 2019
I have a structure S (10000 X 1) with 10 fields. I want to calculate (two) means and standard deviations of one particluar field f1. I have condition on field f2.
mean_1 and SD_1: consider the values of f1 (in calculation of mean and SD) if, f2 is positive.
mean_2 and SD_2: consider the values of f1 (in calculation of mean and SD) if, f2 is negative.
Any smart way to do this?

Accepted Answer

Rik
Rik on 29 Aug 2019
Logical indexing:
L=[S.f2]>0;
pos_mean=mean([S( L).f1]);
neg_mean=mean([S(~L).f1]);
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