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Re: Array indexing "Feature" [message #28466 is a reply to message #28464]

Wed, 12 December 2001 14:44

Paul van Delst
Messages: 364
Registered: March 1997

Senior Member

Craig Markwardt wrote:
>
> Andrew Cool <andrew.cool@dsto.defence.gov.au> writes:
>
>> Hi All,
>>
>> One of my colleagues has noted something apparently screwy in the
>> indexing of
>> arrays.
>>
>> e.g. a = indgen(10)
>> print, a(9) -> you get 9
>> print, a(10) -> you get an error, as expected for a zero-based
>> index
>>
>> but if you access the array with the index as a vector, it seems to
>> truncate the index to the maximum allowable:
>
> See "Using Arrays as Subscripts" in the manual. I believe this
> behavior has been true since the dawn of SYSTIME().

Huh. How 'bout that?

IDL> a = indgen(10)
IDL> x=[-100,3, 4, 5]
IDL> print, a(x)
0 3 4 5

but only for array subscripts,

IDL> print, a[-100]
% Attempt to subscript A with <INT ( -100)> is out of range.
% Execution halted at: $MAIN$

Seems logical....<insert chirping cricket sounds here>.....in an IDL sorta way.

paulv

--
Paul van Delst Religious and cultural
CIMSS @ NOAA/NCEP purity is a fundamentalist
Ph: (301)763-8000 x7274 fantasy
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[Message index]

		Re: Array indexing "Feature" By: Pavel A. Romashkin on Mon, 17 December 2001 09:40
		Re: Array indexing "Feature" By: k-bowman on Thu, 13 December 2001 08:35
		Re: Array indexing "Feature" By: Liam E. Gumley on Thu, 13 December 2001 07:23
		Re: Array indexing "Feature" By: Paul van Delst on Thu, 13 December 2001 06:17
		Re: Array indexing "Feature" By: David Fanning on Wed, 12 December 2001 16:48
		Re: Array indexing "Feature" By: Kristine Hensel on Wed, 12 December 2001 16:31
		Re: Array indexing "Feature" By: Andrew Cool on Wed, 12 December 2001 16:10
		Re: Array indexing "Feature" By: Jeff Jones on Wed, 12 December 2001 15:03
		Re: Array indexing "Feature" By: Paul van Delst on Wed, 12 December 2001 14:44
		Re: Array indexing "Feature" By: Craig Markwardt on Wed, 12 December 2001 14:28
		Re: Array indexing "Feature" By: David Fanning on Wed, 12 December 2001 14:12

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