You could, but unless the matrices are small, it would be slower because it wouldn't use optimized matrix multiplication.
2015-07-08 10:36 GMT-04:00 Josh Langsfeld <[email protected]>: > Maybe I'm missing something obvious, but couldn't you easily write your > own 'cross' function that uses a couple nested for-loops to do the > arithmetic without any intermediate allocations at all? > > On Tuesday, July 7, 2015 at 6:24:34 PM UTC-4, Matthieu wrote: >> >> Thanks, this is what I currently do :) >> >> However, I'd like to find a solution that is both memory efficient (X can >> be very large) and which does not modify X in place. >> >> Basically, I'm wondering whether there was a BLAS subroutine that would >> allow to compute cross(X, w, Y) in one pass without creating an >> intermediate matrix as large as X or Y. >> >>
