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Re: REBIN needs explaining [message #41926 is a reply to message #41925]

Wed, 01 December 2004 00:23

Chris Lee
Messages: 101
Registered: August 2003

Senior Member

In article <MPG.1c16c3fd524557b998988c@news.frii.com>, "David Fanning"
<davidf@dfanning.com> wrote:

...
> INTERPOLATE(A, 3./11. * FINDGEN(12))
> PRINT, B
> IDL prints:
> 0 2 5 8 10 13 16 19 21 24 27 30
> ************************************************* But,
>
> IDL> Print, 3./11. * FINDGEN(12))
> 0.000000 0.272727 0.545455 0.818182 1.09091
> 1.36364 1.63636 1.90909 2.18182 2.45455 2.72727
> 3.00000
> How in the world to *those* numbers, when applied to A, produce the
> result I get? Seems like magic to me. :-( Cheers,
> David
>

It looks like IDL is flooring the numbers (or just dropping the floating
point part) to make them INTs.

IDL> a=[0,10,20,30]
IDL> print, interpolate(a,findgen(12)*3/11.)
0 2 5 8 10 13 16 19 21
24 27 30

IDL> print, interpolate(a*1.0,findgen(12)*3/11.)
0.00000 2.72727 5.45455 8.18182 10.9091 13.6364
16.3636 19.0909 21.8182 24.5455 27.2727 30.0000

IDL> print, interpol(a, 12)
0.00000 2.72727 5.45455 8.18182 10.9091 13.6364
16.3636 19.0909 21.8182 24.5455 27.2727 30.0000

Chris.

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[Message index]

		Re: REBIN needs explaining By: David Fanning on Wed, 01 December 2004 04:38
		Re: REBIN needs explaining By: Paolo Grigis on Wed, 01 December 2004 00:45
		Re: REBIN needs explaining By: b.hinrichsen on Wed, 01 December 2004 00:38
		Re: REBIN needs explaining By: Chris Lee on Wed, 01 December 2004 00:23
		Re: REBIN needs explaining By: David Fanning on Tue, 30 November 2004 16:53
		Re: REBIN needs explaining By: JD Smith on Tue, 30 November 2004 15:56

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