Re: Comparing vectors

[Jaroslav Hajek]

On Mon, Jan 25, 2010 at 6:14 AM, Mike B. <address@hidden> wrote:

Hi All,

Would appreciate help cracking this:

I have two matrices of row vectors  A ( n X d ) and B ( m X d ), n>m . In both matrices the vectors are binary, that is, each component is either 0 or 1.

What is an efficient way to find which vectors from B are already in A, for example,
A( 2, : ) equals B( 4, : ) etc. For each row in B I need the corresponding row from A.

Thanks,
Mike.

[C, I]  = intersect (B, A, "rows");

-- 
RNDr. Jaroslav Hajek, PhD
computing expert & GNU Octave developer
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz