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Re: what is the highest subscript in the array?!? [message #70850 is a reply to message #70774]

Fri, 07 May 2010 11:51

munka
Messages: 36
Registered: December 2009

Member

On May 7, 10:37 am, eddie <eha...@gmail.com> wrote:
>> PS: Right before I posted this, I searched and I figured that
>> array[[-1]] should return the highest array value... but it doesn't,
>> and I'm still stumped.
>
> Add a 'u' and it should. A negative unsigned number "wraps" to
> produce a large number.
>
> IDL> array = indgen(10)
> IDL> print,array[[-1u]]
> 9
> This is similar to Carsten's huge number as an index. You can use
> array[[-1ull]] if you are concerned that your array might have more
> than a gajillion elements.
>
> Unfortunately this trick only works for the last element, array[[-2u]]
> still returns the last element of the array, not the second to last.
>
> Cheers,
> eddie

IDL> flux=findgen(10)
IDL> print,flux
0.00000 1.00000 2.00000 3.00000 4.00000
5.00000
6.00000 7.00000 8.00000 9.00000
IDL> print,flux[[-1u]]
9.00000
IDL> print,flux[5:*]
5.00000 6.00000 7.00000 8.00000 9.00000

Yes! The -1u works! I think I remembered the "trick" that I was
originally thinking of. It doesn't do what I want it to do, but the
[[-1u]] works!

Thanks for the responses!
~Bill

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[Message index]

		what is the highest subscript in the array?!? By: munka on Thu, 06 May 2010 19:12
		Re: what is the highest subscript in the array?!? By: munka on Fri, 07 May 2010 19:09
		Re: what is the highest subscript in the array?!? By: penteado on Fri, 07 May 2010 12:05
		Re: what is the highest subscript in the array?!? By: munka on Fri, 07 May 2010 11:51
		Re: what is the highest subscript in the array?!? By: munka on Fri, 07 May 2010 11:46
		Re: what is the highest subscript in the array?!? By: eddie on Fri, 07 May 2010 08:37
		Re: what is the highest subscript in the array?!? By: wlandsman on Fri, 07 May 2010 03:35
		Re: what is the highest subscript in the array?!? By: wlandsman on Fri, 07 May 2010 03:20
		Re: what is the highest subscript in the array?!? By: Carsten Lechte on Fri, 07 May 2010 02:34
		Re: what is the highest subscript in the array?!? By: R.G.Stockwell on Thu, 06 May 2010 22:39
		Re: what is the highest subscript in the array?!? By: Giuseppe Papa on Sat, 15 October 2011 11:57

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