On Sep 19, 2008, at 6:41 PM, Puck Ja wrote:
> I plan to make several flux objects to monitor the flux along a
> lossy waveguide in the longitudinal direction. Trying not to hard
> code each objects by doing
> (define p1 (add-flux .... (center 1 0 )...
> (define p2 (add-flux .... (center 2 0 )...
> ...etc,
>
> I would appreciate any help on better way to do it. I have tried to
> make list of flux objects such as
> (define pn
> (map (lambda (pos)
> (append (add-flux ....) (add-flux ...) ...) (list 1 2 3 4)))
add-flux does not return a list, so you can't call "append" on it.
You don't need to call "append" inside "map", because "map" already
returns a list.
You can do something like:
(define pm (map (lambda (pos) (add-flux ... (center pos) ...))
(list 1 2 3 4))
There are many references on the Scheme language online that you can
read to help you understand constructs like "map".
Steven
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