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Re: IDL array subscripting issue [message #90230 is a reply to message #90229]

Thu, 12 February 2015 10:36

Fabzi
Messages: 305
Registered: July 2010

Senior Member

On 12.02.2015 19:26, Paul van Delst wrote:
>
> I really like the use of negative indices to reference from the end of
> the array. The above url has the following "note" in the section about
> clipping:
>
> <quote>
> Note: Because of the confusion between the clipping of array subscripts
> and the use of negative indices (see the next section), it is best to
> avoid using code that relies on this clipping behavior.
> </quote>
>
> Just sayin'. Not judging.

Haha, I knew this one would come, and I agree

I mean that I like the fact that array[[-1,2,3,-1]] is not throwing an
error, even before negative indices were added to IDL.

say that you're code relies on following:

inds = [-1,2,3,-1]
out = arr[inds]
p = where(inds lt 0, cnt)
if cnt ne 0 then out[p] = !VALUES.F_NAN

How would write the snipset above with
STRICTARRSUBS compile_opt?

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[Message index]

		IDL array subscripting issue By: David B on Thu, 12 February 2015 09:22
		Re: IDL array subscripting issue By: David B on Thu, 12 February 2015 09:23
		Re: IDL array subscripting issue By: Fabzi on Thu, 12 February 2015 09:29
		Re: IDL array subscripting issue By: Paul Van Delst[1] on Thu, 12 February 2015 10:26
		Re: IDL array subscripting issue By: Fabzi on Thu, 12 February 2015 10:36
		Re: IDL array subscripting issue By: David Fanning on Thu, 12 February 2015 10:05
		Re: IDL array subscripting issue By: David B on Fri, 13 February 2015 01:32

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