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Re: rebin question [message #29877 is a reply to message #11091]

Mon, 25 March 2002 14:07

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

"Mark Fardal" <fardal@coral.phys.uvic.ca> wrote in message
news:yj1zo0xta36.fsf@coral.phys.uvic.ca...
> hradilv.nospam@yahoo.com (Vince) writes:
>> Is it possible to define a function or procedure in IDL that can take
>> an arbitrary number of arguments...
>
> Sure. Something like this:
>
> function my_rebin, a, $
> arg0, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9
> ;continue to heart's content
>
> narg = n_params()-1
> command = 'result = round( rebin( float(a)'
> for i = 0, narg-1 do begin
> command = command + string(', arg',i,format='(a,i0)')
> endfor
> command = command + ') )'
> junk = execute(command)
> return, result
> end
>
> I imagine there are limits placed on this technique by the maximum
> number of arguments to an IDL procedure, or the maximum length of a
> string EXECUTE can handle.

The maximum number of arguments to an IDL procedure is far higher than
any sane programmer would want to use. The maximum length of an
EXECUTE'd string used to be a significant limitation in earlier
versions of IDL (I think it was 64, later 256) but in 5.4 or 5.5 it
was also increased to an effectively infinite value.

When writing wrapper procedures of this sort (which I do quite
often, for various reasons) I prefer to use this form

pro myfoo, p1, p2, ...
case n_params() of
0: foo
1: foo, p1
2: foo, p1, p2
...
endcase
end

I have gone as far as handling 15 positional parameters, but I don't
think I've ever used more than 4.

--
Mark Hadfield
m.hadfield@niwa.co.nz Ka puwaha et tai nei
http://katipo.niwa.co.nz/~hadfield Hoea tatou
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		REBIN Question By: pford on Sat, 14 March 1998 00:00
		Re: REBIN Question By: pford on Wed, 18 March 1998 00:00
		Re: REBIN Question By: Armand J. L. Jongen on Tue, 17 March 1998 00:00
		Re: rebin question By: hradilv.nospam on Fri, 22 March 2002 09:11
		Re: rebin question By: Mark Fardal on Sun, 24 March 2002 22:50
		Re: rebin question By: Jonathan Joseph on Fri, 22 March 2002 10:40
		Re: rebin question By: Craig Markwardt on Fri, 22 March 2002 10:31
		Re: rebin question By: Jonathan Joseph on Mon, 25 March 2002 14:24
		Re: rebin question By: Mark Hadfield on Mon, 25 March 2002 14:07
		Re: rebin question By: JD Smith on Fri, 22 March 2002 11:49
		Re: rebin question By: Jonathan Joseph on Fri, 22 March 2002 11:20
		Re: rebin question By: David Fanning on Fri, 22 March 2002 11:14
		Re: rebin question By: hradilv.nospam on Fri, 22 March 2002 10:53
		Re: rebin question By: Jonathan Joseph on Fri, 22 March 2002 10:53

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