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Re: MAKE_ARRAY question [message #24730 is a reply to message #24729]

Fri, 13 April 2001 10:08

btt
Messages: 345
Registered: December 2000

Senior Member

Hi Paul,

X = MAKE_ARRAY( n_pts, TYPE = 4 + KEYWORD_SET(DOUBLE), /NOZERO)

The above should get you the correct type of array (Double type is 5
while Float type is 4.) I don't know if you can get into trouble with
simply passing the DOUBLE keyword along. It works on this MAC (a float
is returned if DOUBLE = 0).

Ben

Paul van Delst wrote:
>
> Hi there,
>
> I want to create an array that by default should be FLOAT but can be specified as DOUBLE
> by the user as a keyword input to a function. Instead of the following:
>
> FUNCTION my_func, n_pts, double = double
>
> IF ( KEYWORD_SET( double ) ) THEN $
> x = MAKE_ARRAY( n_pts, /DOUBLE, /NOZERO ) $
> ELSE $
> x = MAKE_ARRAY( n_pts, /FLOAT, /NOZERO )
>
> .....
>
> END
>
> can I rely on the fact that NO type keywords to MAKE_ARRAY means default FLOAT? I.e. :
>
> FUNCTION my_func, n_pts, double = double
>
> x = MAKE_ARRAY( n_pts, DOUBLE = double, /NOZERO )
>
> .....
>
> END
>
> The MAKE_ARRAY documentation does not specifically state that the default array created is
> a FLOAT. Does anyone know if this *is* documented anywhere so I'm not setting my function
> up (which I use *a lot*) to fall in a heap when IDL 5.5+ is released and RSI happened to
> decide a default LONG would be better?
>
> Or is there some other natty way to do this?
>
> Thanks for any help.
>
> paulv
>
> --
> Paul van Delst A little learning is a dangerous thing;
> CIMSS @ NOAA/NCEP Drink deep, or taste not the Pierian spring;
> Ph: (301)763-8000 x7274 There shallow draughts intoxicate the brain,
> Fax:(301)763-8545 And drinking largely sobers us again.
> paul.vandelst@noaa.gov Alexander Pope.

--
Ben Tupper
Bigelow Laboratory for Ocean Sciences
180 McKown Point Rd.
W. Boothbay Harbor, ME 04575
btupper@bigelow.org

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[Message index]

		Re: MAKE_ARRAY question By: Paul van Delst on Fri, 13 April 2001 12:03
		Re: MAKE_ARRAY question By: Liam E. Gumley on Fri, 13 April 2001 11:52
		Re: MAKE_ARRAY question By: Liam E. Gumley on Fri, 13 April 2001 11:48
		Re: MAKE_ARRAY question By: Craig Markwardt on Fri, 13 April 2001 11:38
		Re: MAKE_ARRAY question By: Paul van Delst on Fri, 13 April 2001 10:26
		Re: MAKE_ARRAY question By: Paul van Delst on Fri, 13 April 2001 10:19
		Re: MAKE_ARRAY question By: btt on Fri, 13 April 2001 10:08

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