SHOW

Display axes of affine mappings as images, if available

     SHOW(W,N,BACKGROUND)

If W is a affine mapping operating in a space defined by images  (i.e. each object in the space is an image) and the image size is  properly stored in W (SIZE_IN), then the images corresponding to the axes  of the affine mapping are displayed.

The number of horizontal images is determined by N. If N is not given an  approximately square window is generated.

Borders between images and empty images are given the value  BACKGROUND (default: gray (0.5));