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Re: Large array indices [message #13160]

Fri, 16 October 1998 00:00

Alex Schuster
Messages: 124
Registered: February 1997

Senior Member

U Salford Guest Account wrote:

> Just a quick question...
>
> how do I (*is it possible*) create an array greater than 2^15?

Just do it :) arr = intarr( 100000 )

> And then how do I index it with a vaule greater than a int type?

You need to use longs instead of integers. The 10000 two lines above is
converted to a long, so this works. You just must be sure that you are
using longs, something like arr=intarr(2^16) doesn't work:

IDL> help, 2^16
<Expression> INT = 0

But it you make the 2 a long (by adding the L):

IDL> help, 2L^16
<Expression> LONG = 65536

This allows a maximum size of 2^32-1 bytes. If you need more, you have a
problem.

Alex
--
Alex Schuster Wonko@weird.cologne.de PGP Key available
alex@pet.mpin-koeln.mpg.de

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Re: Large array indices

By: Alex Schuster on Fri, 16 October 1998 00:00

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