comparison/checking without for loop

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Ricky 2012-5-4

Hi there,

Say if I have a random event with just -1 and 1. e.g. a = randsrc(5,1);%that will generate a 5x1 matrix with just -1 or 1

Now say if I want to check how many of -1 or 1 in a, how can I do that without using for loop? I try to do this but doesn't work:

m =0;
if(a == 1)
m = m+1;
end

Any help would be really appreciated.

Cheers,

Rak

Andrei Bobrov 2012-5-4

accumarray((a > 0) + 1,a)

Geoff 2012-5-4

nneg = sum(a==-1);
npos = sum(a==1);

Geoff 2012-5-4

Yes... replace '0' and '42' in my example with 't1' and 't0' respectively.

Ricky 2012-5-4

Thanks Geoff!!

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