If I understand properly: Hadamard product is *
Kroneker product is ([:,/[:,./"3*/) Or, block=: 1 : '[:,/[:,./"3 u' */ block There are of course other ways of defining this. Khatri-Rao product is A */block &.> B and works on a matrix of boxed matrices Tracy-Sigh product is (1 0 3 |: */)block&.>/block and also works on a matrix of boxed matrices Vector cross product gets interesting because it is typically defined on 3 element vectors and there are at least two very distinct ways of generalizing that to vectors of other lengths. Anyways, the paper sounds interesting, and I'd like a copy if it's not too much trouble. Thanks, -- Raul On Tue, Apr 29, 2014 at 3:17 PM, mikel paternain <[email protected]>wrote: > In a excellet review paper (see below [1]) Shuangzhe Liu & Götz Trenkler > show some results on matrix products: > > - Hadamard product > - Kroneker product > - Khatri-Rao product > - Tracy-Sigh product > - Khatri-Rao sum > - Tracy-Sigh sum > - Vector cross productSchur complement, etc. > > With this thread, we intend to create a collaborative work to find the > J-expressions that meet these products and sums. > If you want to collaborate, these will be published in next issue of > Journal of J (deadline May-31) > Thanks in advance, > Mikel > JoJ > > ----------------------------------------------------------------------------------------------------------------- > [1] There is a free version on the webif you can not find it, we can send > you a copy > > HADAMARD, KHATRI-RAO, KRONECKER AND OTHER MATRIX PRODUCTS > Shuangzhe Liu & Götz Trenkler > International Journal of Infornation ans Systems Sciences > Vol. 4, N. 1, 160-177 > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
