Hello,

I just spent a few minutes on figuring out how to use map-n-grids as there are no examples in the distribution or documentation.

Here is one example, here is one that accomplishes the following (in pseudo-code):

(map 'grid #'(lambda (x1 x2) (- x1 x2)) grid1 grid2)

(map-n-grids :sources `((,*array-3-4-double-float* ,(affi *array-3-4-double-float*))
            (,*array-3-4-double-float* ,(affi *array-3-4-double-float*)))
         :combination-function #'(lambda (i x1 x2)
                       (print i)
                       (- x1 x2)))

In this example, I am not sure of the role of the first variable (I did not have more time to stare at map.list)

Mirko