On Thu, Jul 15, 2010 at 12:00 PM, Emmanuel Bengio <beng...@gmail.com> wrote:
> Ok I get it. Thanks! > > Numpy syntax that works for me: > numpy.sum(a[:,:,:,numpy.newaxis]*b[:,numpy.newaxis,:,:],axis=-2) > > The leading "..." gives the same thing, but iterates over all the leading indicies in case you want multidimensional arrays of matrices ;) You can also use the sum method which might be a bit more economical: (a[:,:,:,numpy.newaxis]*b[:,numpy.newaxis,:,:]).sum(axis=-2) How do the execution times compare? <snip> Chuck
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