how to improve sequence plotting speed (to get more fluent animation)?

[Dr.-Ing. Torsten Finke]

Hello, 

maybe I'm wrong but I feel, that former versions of Octave had a higher speed
in sequence plotting and produced smoother animations. Now I would like to ask, 
how
plotting speed could be improved. 

In order to get an impression of timings, I wrote a simple script (see below) 
for octave
and nearly equvalent for perl and compared the result. While the perl version 
(that
simply run's gnuplot through a primitive pipe) gives a fluent animantion, the
octave version keeps stagnating on every single plot command.

What would my mistake be? 

Any suggestions appretiated. 

Thanks to the Octave developers for their great work.

Best regards


T. Finke

Version Info:
- GNU Octave, version 3.2.4
- G N U P L O T  Version 4.2 patchlevel 5
- Linux 2.6.31.5 i686 (OpenSuSE 11.2) 


### Scripts

Octave: sine.m
# ---
t = [0:100]/5;
s = sin(t) .* exp(-t/5); 
a = [0, 20, -1, 1];
k = 0; 
while k >= 0, 
    plot(t, sin(k) * s);
    axis(a);
    drawnow();
    k = k + 0.1;
end
# ---

Perl: sine.pl
# ---
#!/usr/bin/perl
open GP, "|gnuplot"; 
my @t = map { $_ / 5 } ( 0 .. 100 );
my $k = 0;
while ( $k >= 0 ) {
    my @d = map {"$_\t" . (sin($k)*sin($_)*exp(-$_/5)) . "\n" } @t; 
    print GP "plot [0:20][-1:1] '-' w l\n", @d, "e\n"; 
    $k += 0.1;
}
# ---






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