I am sure there is a simple answer to this, but I would like to know it. Say I have two matrices:
a =: 1 4 $ 1 2 3 4 b =: 2 4 $ 10 11 12 13 14 15 16 17 and I want to multiply a's single row element-wise with each of b's rows. Not matrix multiplication, so the resulting matrix should have dimensions 2 4, same as b. Obviously a * b gives a length error, So does a *"1 1 b My best solution is pretty ugly, (($b)$,a ) * b i.e. reshape a so it has the same number of rows as b, which duplicates the items of its top row into the second row and then multiply row-wise. Is there a better way? Incidentally, isn't a*1 1 b a row-to-row multiplication. I thought this would have worked, and am slightly confused why it doesn't. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
