Not a general solution, but the 3 convolutions can be computed as follows. pp=: +//.@(*/) NB. 1D
ppp=: +//.@(pp"1/) NB. 2D pppp=: +//.@(ppp"2/) NB. 3D 1D h (conv-:pp) f 1 2D h (conv-:ppp) f 1 3D h (conv-:pppp) h 1 -- Met vriendelijke groet, =@@i ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
