| Re: Passing zero as a Parameter/ NOT KEYWORD_SET [message #16049 is a reply to message #16040] |
Wed, 30 June 1999 00:00   |
R.Bauer
Messages: 1424
Registered: November 1998
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Senior Member |
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Martin Schultz wrote:
> Martin Schultz wrote
>
> and D. Fanning, R. Bauer and J.D. Smith replied
>
> [...]
>
> oh well! Just when I for once thought I knew IDL ;-(
> (1) I confess: I confused IF with KEYWORD_SET. It is still sometimes
> enstranging that
> IF (2) THEN PRINT,'TRUE'
> will not print anything...
Did you know that's
if (3) then print,'true'
will print 'true'
All odd number gives true.
Reimar
>
>
> (2) Of course, n_elements(var) eq 1 only makes sense when you expect a
> scalar. Guess, I wasn't clear enough here. It's just that I sometimes
> found I was running into trouble with ambiguous keywords such as COLOR
> which can occasionally be a vector (see SPLOT), but must be scalar on
> (most) other occasions. Now the test 'EQ 1' is of course only suitable
> for the 'other occasions'.
>
> (3) Reimar Bauer makes a good point that you want to define a variable
> locally if you want to make sure not to pass it back (however, I often
> find that passing previously undefined variables back is useful)
>
> Gotta go back and learn some more ;-)
>
> Martin
>
> |||||||||||||||\\\\\\\\\\\\\-------------------///////////// //|||||||||||||||
> Martin Schultz, DEAS, Harvard University, 29 Oxford St., Pierce 109,
> Cambridge, MA 02138 phone (617) 496 8318 fax (617) 495 4551
> e-mail mgs@io.harvard.edu web http://www-as/people/staff/mgs/
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