From octave-graphics-request at bevo dot che dot wisc dot edu  Thu May 25 11:47:45 2000
Subject: arrow and linewidth
From: Stephen Eglen <stephen at cogsci dot ed dot ac dot uk>
To: zakaria <jackal at unsyiah dot ac dot id>
Cc: octave-graphics at bevo dot che dot wisc dot edu
Date: Thu, 25 May 2000 17:47:41 +0100 (BST)

 > I have any problem about make arrow in looping and make linewidth.
 > this command :
 > i=1;j=4;
 > octave>gset arrow from i,j to i+2,j+3
 > octave>    line 0: undefined variable: i
 > 
 > and problem make linewidth :
 > if I can make linewidth in gnuplot but in octave can't
 > in gnuplot :
 > gnuplot>plot (10) lw 4

hi, for detailed interaction with gnuplot process, you are best using
graw() to send a string to the process.

e.g. something like (untested code here)

cmd = sprintf("set arrow from %f,%f to %f,%f\n", i, j, i+2, j+3);
graw(cmd);

graw() has been present since 2.0.14 I think.

cheers, stephen