Steve: Thanks for the hint (I did poor example on my problem). My main issue was on whether display-fluxes can work with a list input. Your answer indirectly confirmed that it is the case. And by using (apply display-fluxes pm),
the problem is solved. Much thanks!! Puck On Mon, Sep 22, 2008 at 5:16 PM, Steven G. Johnson <[EMAIL PROTECTED]>wrote: > 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 > > _______________________________________________ > meep-discuss mailing list > [email protected] > http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss > -- Shiou-jyh (Puck) Ja, PhD Tel: 1.405.762.1471 [EMAIL PROTECTED]
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