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Re: Clever Where() test [message #4441 is a reply to message #4386]

Tue, 30 May 1995 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

steinhh@amon.uio.no (Stein Vidar Hagfors Haugan) writes:

> 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

Hi, Stein Vidar!

Even more nitty nit-picking: The post did say "a scalar element of a
structure". However, you're correct--Paul's way would work in either case.

Bill Thompson

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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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