how can I find the rows number that all are zero?

2015 5 22
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I have a matrix for example:
prec=[ 0 0 0 0; 0 0 0 0; 1 0 0 1; 0 1 0 1];
I want to find the rows number that all the elements are zero i.e. first and second row. I write my cod as:
for i=1:4;
x=find(prec(i,:))==0
end
but it gives wrong answer. How can I write it?
Thanks in advance...

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