How to count negative and postive values in a matrix?

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

Answer 1

[Azzi Abdelmalek]

s=sign(A)
ipositif=sum(s(:)==1)
inegatif=sum(s(:)==-1)

[trailokya]

But how can i get the mean and standard deviation of the negative values sir?

[Azzi Abdelmalek]

Use mean and std functions

[Torsten]

m=mean(A(s==-1))

st=std(A(s==-1))

Best wishes

Torsten.

[trailokya]

Thank you sir