comp.lang.idl-pvwave archive: archive » Bug in N

Home » Public Forums » archive » Bug in N_PARAMS?

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Bug in N_PARAMS? [message #64053 is a reply to message #64011]

Sun, 30 November 2008 14:06

Mark[1]
Messages: 66
Registered: February 2008

Member

On Nov 28, 11:02 pm, Reimar Bauer <R.Ba...@fz-juelich.de> wrote:
> The usecase for me is to call a helper routine if not enough parameters
> were used.
>
> e.g.
>
> if n_params() lt 2 then begin
> MESSAGE,call_help(),/cont
> return
> endif
>
>

Sure, but even if 2 parameters were supplied, you still don't know if
the variables they're associated with are defined. If you're going to
check for that anyway, with N_ELEMENTS, the N_PARAMS check is
redundant.

Eg.

pro mypro, a, b

if n_elements(a) eq 0 || n_elements(b) eq 0 then begin
MESSAGE,call_help(),/cont
return
endif

end

Report message to a moderator

[Message index]

		Bug in N_PARAMS? By: Kenneth P. Bowman on Mon, 24 November 2008 11:31
		Re: Bug in N_PARAMS? By: David Fanning on Tue, 02 December 2008 07:10
		Re: Bug in N_PARAMS? By: Mark[1] on Mon, 01 December 2008 14:55
		Re: Bug in N_PARAMS? By: Jeremy Bailin on Mon, 01 December 2008 06:11
		Re: Bug in N_PARAMS? By: Mark[1] on Sun, 30 November 2008 14:06
		Re: Bug in N_PARAMS? By: R.Bauer on Fri, 28 November 2008 02:02
		Re: Bug in N_PARAMS? By: pgrigis on Wed, 03 December 2008 11:15
		Re: Bug in N_PARAMS? By: David Fanning on Wed, 03 December 2008 10:49
		Re: Bug in N_PARAMS? By: R.Bauer on Wed, 03 December 2008 09:59

Previous Topic:	Re: Bug in N_PARAMS?
Next Topic:	Re: streamlines over contour without iVector

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 00:03:37 PDT 2025

Total time taken to generate the page: 0.00532 seconds