C++ for Scientists - Technische Universität Dresden

240 CHAPTER 10. PROGRAMMING TOOLS
0 1
0.25 0.968713
0.75 0.740851
1.25 0.401059
1.75 0.0953422
2.25 -0.110732
2.75 -0.215106
3.25 -0.237847
3.75 -0.205626
4.25 -0.145718
4.75 -0.0807886
5.25 -0.0256738
5.75 0.0127226
6.25 0.0335624
6.75 0.0397399
7.25 0.0358296
7.75 0.0265507
8.25 0.0158041
8.75 0.00623965
9.25 -0.000763948
9.75 -0.00486465
plot "results" w l plot "results"
The first column represents the x coordinate and the second colum contains the corresponding
y coordinate values. We can plot this using the command:
plot "results" w l
The command
plot "results"
only plots stars, no line. The command help is also useful. For 3D plots, i.e. a table with three
columns, we use the command splot.
10.5 Unix and Linux
Unix (and Linux) are not used as often as Windows platforms, although for scientific programming
they are popular development platforms. The Unix operating system is a command line
system with several graphical interfaces. Especially in Linux, the graphical interfaces are well
developed so that you get a windows like look and feel. Although you can easily browse through
the directories, create new directories and move data around with a few mouse clicks, it may
be interesting to know at least a few Unix commands:
• ps: list of my processes,
• kill -9 id : kill the process with id id,