MATLAB: Using find with a vector without having to use a for loop

findhistc

I have code which does
for t = 1: length(vector2)
    idx(t) = find(vector <=vector2(t), 1, 'last');
end
Can I call find.m without using a for loop (or bsxfun.m) and if so how?
Or should I just use histc?
[~,idx]=histc(vector2, vector);

Best Answer

Hi,
use bsxfun and make sure one vector is a row vector and the other a column vector (a would be vector and b would be vector2)
 a = [1 2 3 4 5 6]
 b = [ 1 5 8 3 -10 2]
 idx = bsxfun(@le,a',b)
Now you need to get a bit tricky I guess:
 tmp = idx*(10.^[1:numel(b)]')
 floor(log10(tmp))
Not sure if maybe log2 would be faster, you would need to try it:
   tmp = idx*(2.^[1:numel(b)]')
   floor(log2(tmp))
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