[Gsll-devel] grid: map-n-grids example

[Liam Healy]

I now have made some improvements to the documentation which
include an example of map-n-grids, and I've also expanded the
docstring for the function greatly so that the explanation is better.

If you want to add vectors a+2b you could do this:

(map-n-grids :sources `((,#31m(1 2 3) nil) (,#31m(9 8 7) nil))
             :combination-function (lambda (a b) (+ a (* 2 b))))
#31m(19 18 17)

Liam


On Thu, Mar 4, 2010 at 4:48 PM, Mirko Vukovic <mirko.vukovic at gmail.com> wrote:
> 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
>
>
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