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Re: Octave and gzipped files

From: Dmitri A. Sergatskov
Subject: Re: Octave and gzipped files
Date: Mon, 8 Jan 2007 16:04:31 -0700

On 1/8/07, Geordie McBain <address@hidden> wrote:
On Mon, 2007-01-08 at 22:16 +0000, Joseph Wakeling wrote:
> Is it possible for Octave to read data from gzipped ascii files?
> I'm having to deal with some rather large data files from simulations
> and it would be convenient to gzip them---it reduces their size by
> anything from 65-70%.
> If Octave can't directly read the gzipped file I suppose an alternative
> would be for Octave to call gzip to temporarily unzip the file, read the
> data, and then zip it back up again.  Is this possible?

Hello.  My Octave (2.9.9 on Debian etch) can save gzipped ascii files;

  octave> save -ascii -z A.gz A

and load them again too (automatically detecting the need for

  octave> load A.gz

Geordie McBain

And you can read gzipped files with C - style file i/o commands
(fopen, fscanf, etc).
See "help fopen" for details, here is an excerpt:

    Additionally, you may append a "z" to the mode string to open a
    gzipped file for reading or writing.  For this to be successful,
    you must also open the file in binary mode.



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