This chapter describes interface functions for
GNUPLOT ox server ox_sm1_gnuplot
.
These interface functions are defined in the file gnuplot
.
The file `gnuplot.rr' is at
`$(OpenXM_HOME)/lib/asir-contrib'.
[255] gnuplot.start(); 0 [257] gnuplot.gnuplot("plot sin(x**2);"); 0
The function
gnuplot.heat
(dt,step) demonstrates our gnuplot interface.
It numerically solves the heat equation
The segment [0,1] is devided into Heat_N
segments.
The static variable Heat_N
can be set by the function
gnuplot.heat_set_N
.
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.
gnuplot.heat_set_N(20); gnuplot.heat(0.001,30); (CFL number is 0.4) gnuplot.heat_set_N(20); gnuplot.heat(0.003,30); (CFL > 0.5 unstable)
Author of GNUPLOT
: Thomas Williams, Colin Kelley.
http://www.gnuplot.info
gnuplot.start
ox_sm1_gnuplot
on the localhost.
ox_sm1_gnuplot
on the localhost.
It returns the descriptor of ox_sm1_gnuplot
.
Xm_noX = 1
to start ox_sm1_gnuplot
without a debug window.
Gnuplot_proc
.
P = gnuplot.start();
ox_launch
, gnuplot
gnuplot
^
. Use **
instead.
[232] P = gnuplot.start(); 0 *Plot 3 dimensional graph. [233] gnuplot.gnuplot("splot x**2-y**2;"|proc=P); 0 *Plot 2 dimensional graph. [234] gnuplot.gnuplot("plot [-pi:pi] [-2:2] cos(x);"); 0 *Output a graph as a postscript figure. [235] gnuplot.output(|file="hoge.eps"); 0 [236] gnuplot.gnuplot("plot sin(x)*cos(x);"); 0 [237] gnuplot.gnuplot(|file="x11"); 0 *Plot 3 dimensional graph hiding unvisible lines. [236] gnuplot.gnuplot("set hidden3d"); 0 [237] gnuplot.gnuplot("splot (x**2+y**2)*sin(x**2+y**2)"); 0 [238] gnuplot.gnuplot("set isosamples 50"); 0 [239] gnuplot.gnuplot("splot (x**2+y**2)*sin(x**2+y**2)");
ox_launch
, gnuplot.start
, rtostr
,
gnuplot.plot_dots
gnuplot.plot_dots
[ ]
, the screen will be cleared.
[239] P = gnuplot.start(); 0 [240] gnuplot.plot_dots([ ],0); 0 [241] for (I=0; I<10; I++) gnuplot.plot_dots([[I,I^2]]," lines "); [242] A = [ ]; [] [243] for (I=0; I<10; I++) A = append(A,[ [I,I^2]]); [244] A; [[0,0],[1,1],[2,4],[3,9],[4,16],[5,25],[6,36],[7,49],[8,64],[9,81]] [245] gnuplot.plot_dots(A," lines "); 0
gnuplot.start
, plot "fileName" with options
(GNUPLOT command),
gnuplot.clean
, gnuplot
gnuplot.heat
pde_heat_demo
in a future.
Algorithm: NOT Written. (Difference scheme. Courant-Levi-Friedrichs conditions.)
[232] Heat_N = 20$ [233] gnuplot.heat(0.001,30)$
gnuplot.output
GNUPLOT
to output graphic to the file s in the Postscript format.
GNUPLOT
to output graphic to the file s in the Postscript format.
s
is "x11" or this function is called without the argument,
the output will be written to X11 display.
[273] gnuplot.output(|file="hoge.eps"); Graphic output of GNUPLOT will be written to hoge.eps as a Poscript file. 0 [274] gnuplot.gnuplot("plot tan(x)+sin(x);"); 0 [275] gnuplot.output(); Usage of gnuplot.output: gnuplot.output(|file="string") gnuplot.output(|file="x11") Output device is set to X11
gnuplot
gnuplot.plot_function
gnuplot
server to draw a graph of f
gnuplot
server to draw a graph of f
[290] gnuplot.plot_function((x+sin(x))^2); 0 [291] gnuplot.plot_function([x,x^2,x^3]); 0
gnuplot.to_gnuplot_format
gnuplot.stop
GNUPLOT
and remove the temporary fifo file generated
by the mkfifo system call under the temporary directory.
[273] gnuplot.stop()
gnuplot.start
gnuplot.setenv
Use the old method to communicate with gnuplot (version 3). This method does not use mkfifo, but we need a patched version of gnuplot. [273] gnuplot.setenv("gnuplot.callingMethod",0); [274] gnuplot.setenv("plot.gnuplotexec",getenv("OpenXM_HOME")+"/bin/gnuplot4ox"); Calling your own gnuplot binary. [274] gnuplot.setenv("plot.gnuplotexec","/cygdrive/c/program files/gnuplot/pgnuplot.exe");
gnuplot.start
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