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Re: what is the upper limit for IDL array? [message #66567 is a reply to message #66471]

Thu, 21 May 2009 08:52

Jean H.
Messages: 472
Registered: July 2006

Senior Member

Hu wrote:
> Hi,there
>
> I want to know the upper limit number of a 1-D/2-D array (say, Array),
> Is there anybody knows the answer?
>
> I mean, how many elements that I can write into this 1-D/2-D array?
>
> Thanks

here is an answer from Paolo he sent on this topic a few years ago.
Jean

Jean H. wrote:
> Hi all,
>
> I can't remember this... what is the type of the variable used to
index an array? ... in other words, what is the max number of elements
an array can hold, provided the memory is available? Is there a way to
change that, so I can use, let's say, an unsigned long 64?

In the 32-bits version, signed longs are used.
Thus the max number of elements of a byte array is (2^31-offset),
where offset is a small number (around 10).

IDL 64 bit uses signed double precision longs, and the max number
of elements in a byte array is (2^63-offset) [here the offset seems
to be around 512].

For other numeric types, divide the above numbers by the size in
bytes of one element.

Ciao,
Paolo

>
> Thanks,
>
> Jean

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[Message index]

		what is the upper limit for IDL array? By: Hu on Thu, 21 May 2009 08:09
		Re: what is the upper limit for IDL array? By: David Fanning on Thu, 21 May 2009 11:03
		Re: what is the upper limit for IDL array? By: natha on Thu, 21 May 2009 10:32
		Re: what is the upper limit for IDL array? By: Jean H. on Thu, 21 May 2009 08:52
		Re: what is the upper limit for IDL array? By: David Fanning on Thu, 21 May 2009 08:19

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