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Re: tmp file problem +gnuplot

From: John W. Eaton
Subject: Re: tmp file problem +gnuplot
Date: Wed, 27 Jan 1999 02:36:00 -0600 (CST)

On 27-Jan-1999, Daniel Heiserer <address@hidden> wrote:

| John W. Eaton wrote:
| > 
| > On 26-Jan-1999, David Nicholson <address@hidden> wrote:
| > 
| > The reason Octave can't delete the files automatically is that it
| > cannot know when gnuplot is finished with them.
| Well octave doesn't know, but gnuplot should know. Using gnuplots '!'
| they could be deleted or?

If you mean gnuplot's shell escape feature, I'm not sure how that
helps.  The problem is that if you type

  plot (x, y)

The replot fails because Octave doesn't recreate the data files on a
replot command, it just sends a replot command to gnuplot, which then
tries to access the data files again.  Since gnuplot closes and then
tries to reopen the files, it fails.

The fix for this problem is to use gnuplot's ability to handle data
and commands in the same input stream.  It just hasn't been done yet.
The reason Octave did not use this feature from the beginning is that
it did not exist in gnuplot until some 3.6beta release.

| What will be the new gnuplot's benefit for octave?

I'd guess that gnuplot 3.7 is a lot like the recent 3.6beta releases.


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