get the index of the n one in a binary vector

Dear,

I have binary vector like bv=[0,0,0,0,1,0,0,1,1,1,0,0,1,0,1...] and I would like to get the index in bv of the n "1"

For example the index of the 4th "1" in bv is 10.

I know that using while loops and two counters it possible but I asking for are vectorized (more Matlab) solution

Thanks in advance,

Answer 1

[Stephen23]

>> bv=[0,0,0,0,1,0,0,1,1,1,0,0,1,0,1];
>> idx = find(bv);
>> idx(4)
ans =  10