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Re: keyword_set bug or feature [message #4219 is a reply to message #4216]

Fri, 12 May 1995 00:00

zawodny
Messages: 121
Registered: August 1992

Senior Member

In article <3p03k3$ip1@kwuz.nerc-keyworth.ac.uk> wmc@unixa.nerc-keyworth.ac.uk writes:
>
> Another solution is to set key=[0], ie the array containing 0.
> Then keyword_set returns true, and IDL happily uses [0] and 0 fairly
> interchangably.
>

Yes, but in practice this might appear in code as follows:

pro MYPRO, v1, v2, key1=key1, key2=key2
...
if KEYWORD_SET([key1]) then ...
...
return
end

The problem here being that when IDL tries to put key1 into a single
element vector and key1 has not been passed in the call, IDL will barf
with "variable key1 undefined".

I think you were suggesting that the user type instead

IDL> mypro,v1,v2,key1=[0]

If so I think you are asking too much of the user and would be better
off just changing the code to use N_ELEMENTS() instead of KEYWORD_SET().

--
Joseph M. Zawodny (KO4LW) NASA Langley Research Center
Internet: j.m.zawodny@larc.nasa.gov MS-475, Hampton VA, 23681-0001
TCP/IP: ko4lw@ko4lw.ampr.org Packet: ko4lw@n4hog.va.usa.na

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[Message index]

		keyword_set bug or feature By: phil on Fri, 12 May 1995 00:00
		Re: keyword_set bug or feature By: zawodny on Fri, 12 May 1995 00:00
		Re: keyword_set bug or feature By: zawodny on Fri, 12 May 1995 00:00
		Re: keyword_set bug or feature By: wmc on Fri, 12 May 1995 00:00
		Re: keyword_set bug or feature By: thompson on Fri, 12 May 1995 00:00
		Re: keyword_set bug or feature By: llobet on Fri, 12 May 1995 00:00
		Re: keyword_set bug or feature By: sterner on Fri, 12 May 1995 00:00
		Re: keyword_set bug or feature By: thompson on Tue, 16 May 1995 00:00
		Re: keyword_set bug or feature By: soc on Tue, 16 May 1995 00:00
		Re: keyword_set bug or feature By: thompson on Thu, 25 May 1995 00:00

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