a vector of indices of the largest elements in a vector not exceeding the elements of some other vector

[derek(at)milkyway.gsfc.nasa.gov (Derek Hullinger)]

I have two vectors of different sizes (say, A and B):

	A contains floating point values that increase with index
	B contains floating point values

I'd like to create a third vector, C (which would be the same size as
B) such that:

	The nth element in C contains the index of the largest element in A
that does not exceed the nth element in B.

**

For example:

if

A=[10,20,30,40]
B=[12,37]

then

C=[0,2], 

because the 0th element in A is the largest value in A that does not
exceed 12, and the 2nd element in A is the largest value in A that
does not exceed 37.

**

I have found a way to do this if B is a single floating point value
(not a vector of values):

	temp=max(A<B,C)

but I haven't been able to find a way to do this with a vector B.  Any
ideas?