The map builder               a8
--------------------------------

NB. Begin the definition of the transformation builder
NB. Create a sequence of functions by simple steps.

   f1 =. vec %. mat

   f1 F1
0.0833333 _0.375 0.444444

   normalize f1 F1
0.1875 _0.84375 1

   f1 =. vec %. mat
   f2 =. mat *"1 f1
   f3 =. (%. @ f2 @ [) (pr "2 1) ]
   f3i =.     (f2 @ [) (pr "2 1) ]
   builder      =.      norm @ f3
   builderi     =.      norm @ f3i


