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Re: simple vectorizing problem [message #62516 is a reply to message #62427]

Thu, 11 September 2008 05:15

Spon
Messages: 178
Registered: September 2007

Senior Member

> I thought the trick with an indexing array ('a' in the example above)
> would work because if I say
> b = indgen(101)/(!pi/100)
> print, cos(b)
>
> I get not one number out but an array of cos() evaluated from 0 to pi
>
> I guess I don't understand how the cos() example gives me an array
> back, and
> myFunctThatDoesSomeAnalysis(image(*,*,a)) gives me just one number.

Simply put, the IDL function COS() has been specifically written so it
can take either scalars or arrays as arguments. If you want
myFunctThatDoesSomeAnalysis() to do the same, you have to write it in
such a way that it can also handle arrays.
Whether this can be done without expensive FOR loops depends entirely
on what your function does. If it can be done, it's probably
worthwhile doing it though.

> Thanks,
> David M.

Regards,
Chris

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[Message index]

		Re: simple vectorizing problem By: David Fanning on Wed, 10 September 2008 17:14
		Re: simple vectorizing problem By: dpm314 on Wed, 10 September 2008 16:53
		Re: simple vectorizing problem By: Foldy Lajos on Tue, 09 September 2008 02:58
		Re: simple vectorizing problem By: Chris[6] on Tue, 09 September 2008 01:50
		Re: simple vectorizing problem By: David Fanning on Mon, 08 September 2008 19:17
		Re: simple vectorizing problem By: dpm314 on Mon, 08 September 2008 18:48
		Re: simple vectorizing problem By: JD Smith on Thu, 11 September 2008 11:56
		Re: simple vectorizing problem By: Spon on Thu, 11 September 2008 05:15

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