How to count negative and postive values in a matrix?

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trailokya
trailokya 2015-8-5
评论： trailokya 2015-8-5
Sir, how can i get the mean and standard deviation and total numbers of negative values and similarly for positive values in a matrix A(i,j).Please help

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Azzi Abdelmalek
Azzi Abdelmalek 2015-8-5
s=sign(A)
ipositif=sum(s(:)==1)
inegatif=sum(s(:)==-1)
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Torsten
Torsten 2015-8-5
编辑：Torsten 2015-8-5
m=mean(A(s==-1))
st=std(A(s==-1))
Best wishes
Torsten.

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