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GNUPLOT Functions

This chapter describes interface functions for GNUPLOT ox server ox_sm1_gnuplot. These interface functions are defined in the file gnuplot. The file `gnuplot' is at
`$(OpenXM_HOME)/lib/asir-contrib'. 

[nobuki@yama doc]$ asir
This is Asir, Version 991116.
Copyright (C) FUJITSU LABORATORIES LIMITED.
3 March 1994. All rights reserved.
[155] load("xm");
1
xm Version 19991109. ox_help(0); ox_help("keyword"); for help message 
[255] gnuplot_start();
0
[257] gnuplot("plot sin(x**2);");
0

The function heat(dt,step) demonstrates our gnuplot interface. It numerically solves the heat equation The segment [0,1] is devided into Heat_N segments. If the celebrated Courant-Friedrichs-Levi number dt*Heat_N*Heat_N is less than or equal to 0.5, then the explicit scheme is numerically stable. One can observe the instability by changing CFL number. 

  Heat_N=20; heat(0.001,30);   (CFL number is 0.4)
  Heat_N=20; heat(0.003,30);   (CFL > 0.5 unstable)

Author of GNUPLOT: Thomas Williams, Colin Kelley

Functions

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