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Re: Clever Where() test [message #4366]

Fri, 26 May 1995 00:00

steinhh
Messages: 260
Registered: June 1994

Senior Member

In article <3q2tld$8du@post.gsfc.nasa.gov>, thompson@orpheus.nascom.nasa.gov (William Thompson) writes:
|> Paul Probert <probert@uwmfe.neep.wisc.edu> writes:
|>
|> >IDL allows you to give a zero subscript to a scalar,
|> >so you can say:
|> > i=WHERE(...)
|> > IF i(0) EQ -1 THEN BEGIN
|> > ...
|> >
|> >One word of caution. If you have a scalar element of a structure,
|> >for some reason you can't do this:
|> > x={i:0,j:1}
|> > IF x.i(0) ... ;bombs
|> >But you can make it work with more parentheses:
|> > IF (x.i)(0) ... ;works
|> >
|> > Paul Probert
|> > University of Wisconsin
|>
|> So does x(0).i
|>
|> Bill Thompson
|>

Just nit-picking: If the tag i in x.i is an array, only
the (x.i)(0) notation works. This works if x and/or i are
arrays (or scalars).

Stein Vidar

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[Message index]

		Re: Clever Where() test By: steinhh on Fri, 26 May 1995 00:00
		Re: Clever Where() test By: thompson on Thu, 25 May 1995 00:00
		Re: Clever Where() test By: Paul Probert on Thu, 25 May 1995 00:00
		Re: Clever Where() test By: thompson on Thu, 25 May 1995 00:00
		Re: Clever Where() test By: bertin on Thu, 25 May 1995 00:00
		Re: Clever Where() test By: afl on Wed, 24 May 1995 00:00
		Re: Clever Where() test By: offenbrg on Tue, 30 May 1995 00:00
		Re: Clever Where() test By: thompson on Tue, 30 May 1995 00:00

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