about using gnuplot
wiki:gnuplot is a command-line
program that can generate two- and three-dimensional plots of
functions, data, and data fits. It is frequently used for
publication-quality graphics as well as education. The program runs
on all major computers and operating systems (GNU/Linux, Unix,
Microsoft Windows, Mac OS X, and others). It is a program with a
fairly long history, dating back to 1986. Despite its name, this
software is not distributed under the GNU General Public License
(GPL), opting for its own more restrictive open source license
instead.
Firstly, I need to install it in
PC.
In Ubuntu, it is convenient because
of apt-get
typing in terminal: sudo apt-get
insatall gnuplot
If u work on Windows, please download
it from : http://sourceforge.net/projects/gnuplot/?source=directory and
install it. :>
Secondly, we need some tutorials
about gnuplot. u can find many on Internet when u search in google.
Then Open gnuplot.:>
I try to draying a simple frequency
spectrum.We know that the real signal has
a conjugate symmetry sprectrum. Now I create a
wavefile.dat.
-24 0
-23 16
-22 20
-21 24
-20 30
-19 32
-18 36
-17 38
-16 38
-15 24
-14 0
24 0
23 16
22 20
21 24
20 30
19 32
18 36
17 38
16 38
15 24
14 0
I just want to draw 2D picture so
there r two column. 1st is X axis and 2nd is Y axis.
typing code in terminal:
gnuplot> unset key
gnuplot> set
xrange[-30:30]
gnuplot> set
yrange[0:60]
gnuplot> set zeroaxis
lt -1 lw 2
gnuplot> set arrow 1
from 25,0 to 30,0 filled size 2,15,60 lw 2
gnuplot> set arrow 2
from 0,55 to 0,60 filled size 2,15,60 lw 2
gnuplot> set arrow 3
from -19,0 to -19,45 filled size 2,15,60 lw 0.8 lt 0 nohead
gnuplot> set arrow 4
from 19,0 to 19,45 filled size 2,15,60 lw 0.8 lt 0
nohead
gnuplot> set label 1
"-Fc-B/2" at -26,-2
gnuplot> set label 2
"-Fc+B/2" at -16,-2
gnuplot> set label 3
"Fc-B/2" at 13,-2
gnuplot> set label 4
"Fc+B/2" at 23,-2
gnuplot> set label 5
"Fc" at 19,-2
gnuplot> set label 6
"-Fc" at -20,-2
gnuplot> set xlabel
"Frequency" font"0,15"
gnuplot> set ylabel
"Power" font"0,15"
gnuplot> plot
"./wavefile.dat" with lines
gnuplot> set xtics 0
gnuplot> replot
gnuplot> set bmargin
2
gnuplot> replot
gnuplot> set bmargin
4
There r the picture.
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