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Re: what is the highest subscript in the array?!? [message #70768]

Thu, 06 May 2010 21:27

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 5/6/10 9:32 pm, Craig Markwardt wrote:
> On May 6, 10:26 pm, Michael Galloy<mgal...@gmail.com> wrote:
>> munka<mynameismu...@gmail.com> wrote:
>>> Hello team,
>>
>>> I find myself wanting to use the highest subscript in an array and
>>> coding "flux[n_elements(flux)-1]"... I seem to remember seeing a
>>> shortcut on here, and I can't remember what it is.
>>
>> You are stuck using that until IDL 8.0 comes out, then you can use -1.
>
> Really? First of all a[-1] used to be an error and now it won't be.
> That could be dangerous change of expectations.
>
> Craig

It does not change valid existing behavoir:

IDL> print, a[[-1]]
0.00000

It would just change conditions which would have caused errors before.
So code that caught the out-of-bounds runtime error instead of just
checking the index will break.

Mike
--
www.michaelgalloy.com
Research Mathematician
Tech-X Corporation

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[Message index]

		Re: what is the highest subscript in the array?!? By: Michael Galloy on Thu, 06 May 2010 21:27
		Re: what is the highest subscript in the array?!? By: David Fanning on Thu, 06 May 2010 21:22
		Re: what is the highest subscript in the array?!? By: Michael Galloy on Thu, 06 May 2010 21:21
		Re: what is the highest subscript in the array?!? By: Craig Markwardt on Thu, 06 May 2010 20:32
		Re: what is the highest subscript in the array?!? By: munka on Thu, 06 May 2010 19:44
		Re: what is the highest subscript in the array?!? By: Michael Galloy on Thu, 06 May 2010 19:26
		Re: what is the highest subscript in the array?!? By: Michael Galloy on Thu, 06 May 2010 21:30
		Re: what is the highest subscript in the array?!? By: munka on Thu, 06 May 2010 21:29

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