How to create all points of some grid. What I do in APL with x{jot}.,y If, for istance, x<-1 2 3 and y<-4 5 then I get nested 3x2 matrix of all pairs of coordinates x and y like |[1 4] [1 5]| |[2 4] [2 5]| |[3 4] [3 5]| Thanks, Sasha.