How to compute a solution with a sum in matlab

My code is like this:

s=0;
for t=h:length(data);
    s=s+data(t)*data(t-h)
end

And I need to find h to make s=0

[Kautuk Raj]

Can you shed more details about your question?

Answer 1

[Satwik]

s=0;
for h=1:length(data)
    for t=h:length(data);
        s=s+data(t)*data(t-h)
    end
    if(s==0)    
        disp(h);
    end
end

Unrecognized function or variable 'data'.