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Re: Procedures with variable/dynamic argument list?? [message #73077 is a reply to message #73075]

Fri, 22 October 2010 08:14

chris_torrence@NOSPAM is currently offline

chris_torrence@NOSPAM
Messages: 528
Registered: March 2007

Senior Member

On Oct 22, 8:26 am, Paolo <pgri...@gmail.com> wrote:
>
> It comes out pretty ugly indeed... here my "pritn" function
> that I use to work around my bad spelling (!)
> I guess I didn't know about n_params() when I wrote that.
>
> Ciao,
> Paolo
>
> PRO pritn,a1,a2,a3,_extra=_extra
>
> IF exist(a3) THEN print,a1,a2,a3,_extra=_extra ELSE $
> IF exist(a2) THEN print,a1,a2,_extra=_extra ELSE $
> IF exist(a1) THEN print,a1,_extra=_extra
>
> END
>
> ;from solarsoft
> function exist,var
>
> return,n_elements(var) ne 0
>
> end

Hi all,

You might look at SCOPE_VARFETCH. You could dynamically construct the
argument name, and then pass the string to SCOPE_VARFETCH to retrieve
the value. Something like:

PRO pritn,a1,a2,a3,_extra=_extra
for i=1,n_params() do print, SCOPE_VARFETCH('a'+strtrim(i,
2)),_extra=_extra
end

This only helps in cases where you can break up the arguments and do a
call with each one separately.

Paolo, if I could suggest a tweak, you could use a CASE statement
instead:

case n_params() of
1: print,a1,_extra=_extra
2: print,a1,a2,_extra=_extra
3: print,a1,a2,a3,_extra=_extra
else: message,'Incorrect number of arguments'
endcase

This avoids all of those nasty if/else blocks.

-Chris
ITTVIS

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[Message index]

		Re: Procedures with variable/dynamic argument list?? By: Michael Galloy on Mon, 25 October 2010 06:51
		Re: Procedures with variable/dynamic argument list?? By: SonicKenking on Mon, 25 October 2010 00:32
		Re: Procedures with variable/dynamic argument list?? By: pgrigis on Fri, 22 October 2010 08:50
		Re: Procedures with variable/dynamic argument list?? By: chris_torrence@NOSPAM on Fri, 22 October 2010 08:14
		Re: Procedures with variable/dynamic argument list?? By: pgrigis on Fri, 22 October 2010 07:26
		Re: Procedures with variable/dynamic argument list?? By: Kenneth P. Bowman on Fri, 22 October 2010 06:56
		Re: Procedures with variable/dynamic argument list?? By: SonicKenking on Fri, 22 October 2010 02:04
		Re: Procedures with variable/dynamic argument list?? By: Gray on Fri, 22 October 2010 01:57

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