How to count?

2011 4 5
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Hello all, I have a stochastic signal, and I want to count how many of the samples are positive,and how many are negative. Any suggestions?

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Negar
Negar 2011-4-5
Here is my signal:
x1 = 2*(rand(1,N)>0.5)-1;
It is a binay stochastic signal with samples equal to either 1 or -1.
Thanks a lot..

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Robert Cumming
Robert Cumming 2011-4-5

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To find how many equal -1
answer = length(find ( x1 == -1 ));

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Titus Edelhofer
Titus Edelhofer 2011-4-5

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Hi Negar,
just count them
nPos = sum(x1==1)
nNeg = sum(x1==-1)
Titus

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Jan
Jan 2011-4-5
SUM is usually faster than LENGTH(FIND).
nNeg = numel(x1) - nPos

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