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Re: File sizes and the SAVE command [message #48048 is a reply to message #48045]

Wed, 22 March 2006 05:26

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

Klaus Scipal wrote:
> The problem is not related to the calculation of the filesize, but the
> actual amount of memory required
>
> Take two arrays
> a=intarr(100000)
> b=fltarr(100000)
>
> and save them using the save comannd
> the file for array a takes 402096 bytes diskspace
> the file for array b takes 402096 bytes diskspace
>
> save them using openw & writeu
> the file for array a takes 200000 bytes diskspace
> the file for array b takes 400000 bytes diskspace
>
> So the save command seems to waste a lot of diskspace, but why? Does the IDL
> save command convert an integer automatically into a longinteger?
>
> Klaus
>

why not using /compress ?

An idl sav file is not only a binary copy of your value. It does use a
XDR exchange data format to create files which are platform independent.
Each value has always it's XDR description included.

In general one of the scientific data formats e.g. netCDF are much
better to store your data in a common structure which is exchangable to
a lot of platforms too

cheers

Reimar

--
Reimar Bauer

Institut fuer Stratosphaerische Chemie (ICG-I)
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
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[Message index]

		Re: File sizes and the SAVE command By: Maarten[1] on Wed, 22 March 2006 07:27
		Re: File sizes and the SAVE command By: Klaus Scipal on Wed, 22 March 2006 07:17
		Re: File sizes and the SAVE command By: R.Bauer on Wed, 22 March 2006 05:26
		Re: File sizes and the SAVE command By: Klaus Scipal on Wed, 22 March 2006 03:58
		Re: File sizes and the SAVE command By: Maarten[1] on Wed, 22 March 2006 03:10
		Re: File sizes and the SAVE command By: Paolo Grigis on Wed, 22 March 2006 03:08

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