Functions to graph by using a tool called Gnuplot

Gnuplot is a command-line tool that can generate two and three-dimensional plots for functions and data files

Install gnuplot

To install gnuplot, open the terminal by ctrl+alt+t and type this command >sudo apt install gnuplot

You can check gnuplot is install or not by command >gnuplot

Where to type gnuplot command on Linux

Open Linux terminal and type command >gnuplot to see gnuplot terminal on Linux and to exit gnuplot terminal type command > quit or exit

Set terminal type

First  set the terminal type,  which you would like to use, every terminal have a different set of  features

To see the list of the terminals on Linux, type the command

>set terminal

You can use any terminal type which is listed but by default the terminal type will be ‘qt’on Linux and to use new terminal type the command

>set term wxt

The above command show wxt terminal type you choose any terminal as you like

For example

Every  terminal type has different features

For terminal type qt

The command >plot sin(x) produces output like this


When the terminal type changed from  ‘qt’ to ‘wxt’  the same command >plot sin(x) produces different output  bar on the graph

sine wave

Plotting functions to graph

>plot sin(x)

>plot sin(x) with points

>plot cos(x)

>plot sin(x),cos(x)

>plot sin(x),cos(x),exp(x)

>plot sin(x),tan(x),log(x)

Plotting expressions

>plot x**2

Customize plot

>set xrange[-1:13]

>set yrange[-1:15]

>Set xlabel “time”

>set ylabel “water level in cm”



Linetype, color’s and styles

Every terminal type provides different linetype, color, and style, the default line types for a particular terminal can be viewed by command >test

gnuplot test

You can use the  above chat by  commands

For example:

>plot sin(x) linecolor 15

>plot sin(x) dashtype 3

>plot sin(x) linewidth 6

>plot ‘date.dat’ with lines

By using the chart above you can enter the required number of linecolor, dashtype, linewidth

Plotting data

Plotting of data can be done in gnuplot by setting the directory in the right order

Creating a dat file

The dat file can be created by using text editor  on Linux

For example:

# date.dat

#   X        Y

     8         9

     8         5

     4        7

     9        5

     2        6

     8        7

     9       1

     2       0

Save the data in a text editor by file name date.dat

Remember # is a comment

Set the directory

The file  date.dat  can  be plotted by setting directory in the right order which means the place where date.dat file is saved

Open the folder where you have saved the date.dat file on Linux terminal by using commands like ls, cd, cd..

As soon as you reached the folder where you have saved the date.dat file, that means the directory is set in right order, when the directory is set then typed the command> gnuplot and plot date.dat file by command> plot  ‘date.dat’


In order to use multiplot in Gnuplot we need to use a command called > set multiplot  and to use four-quadrant >set size to 0.5,0.5

1: quadrant  >set origin 0,0.5

2: quadrant >set origin  0.5,0.5

3: quadrant >set origin  0,0

4: quadrant >set origin  0.5,0

gnuplot multiplot

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Mohammed Anees

Hey there, welcome to aneescraftsmanship i am Mohammed Anees an independent developer/blogger.

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