Use Matlab for curve plotting in the simviz1.py script. The plots in the simviz1.py script can…

Use Matlab for curve plotting in the simviz1.py script. The
plots in the simviz1.py script can easily be generated by another plotting
program than Gnuplot. For example, you can use Matlab. Some possible Matlab
statements for generating a plot on the screen, as well as hardcopies in
PostScript and PNG format, are listed next.

load sim.dat % read sim.dat into a matrix sim

plot(sim(:,1),sim(:,2)) % plot 1st column of sim as x, 2nd
as y

legend(’y(t)’)

title(’test1: m=5 b=0.5 c=2 f(y)=y A=1 w=1 y0=1 dt=0.2’)

outfile = ’test1.ps’; print(’-dps’, outfile)

outfile = ’test1.png’; print(’-dpng’
»

Use Matlab for curve plotting in the simviz1.py script. The
plots in the simviz1.py script can easily be generated by another plotting
program than Gnuplot. For example, you can use Matlab. Some possible Matlab
statements for generating a plot on the screen, as well as hardcopies in
PostScript and PNG format, are listed next.

load sim.dat % read sim.dat into a matrix sim

plot(sim(:,1),sim(:,2)) % plot 1st column of sim as x, 2nd
as y

legend(’y(t)’)

title(’test1: m=5 b=0.5 c=2 f(y)=y A=1 w=1 y0=1 dt=0.2’)

outfile = ’test1.ps’; print(’-dps’, outfile)

outfile = ’test1.png’; print(’-dpng’, outfile)

The name of the case is in this example taken as test1. The
plot statements can be placed in an M-file (Matlab script) with extension .m.
At the end of the M-file one can issue the command pause(30) to make the plot
live for 30 seconds on the screen. Thereafter, it is appropriate to shut down
Matlab by the exit command. The pause command should be omitted when no screen
plot is desired.

Running Matlab in the background without any graphics on the
screen can be accomplished by the command

matlab -nodisplay -nojvm -r test1

if the name of the M-file is test1.m. To get a plot on the
screen, run

matlab -nodesktop -r test1 > /dev/ &

Here, we direct the output from the interactive Matlab
terminal session to the “trash can” /dev/ on Unix systems. We also place
the Matlab execution in the background (&) since screen plots are
associated with a pause command (otherwise the Python script would not terminate
before Matlab has terminated).

Modify a copy of the simviz1.py script and replace the use
of Gnuplot by Matlab. Hint: In printf-like strings, the character % must be
written as %%, because % has a special meaning as start of a format
specification. Hence, Matlab comments must start with %% if you employ
printf-like strings or variable interpolation when writing the M-file.

»

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