Difference between revisions of "Gnuplot/C2/Example-scripts-and-demo-folder/English"

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Doing this allows us to scroll further in the axis limits.
Doing this allows us to scroll further in the axis limits.
This feature is enabled in the '''script''' file.

Revision as of 16:45, 11 September 2019

Visual Cue Narration
Slide Number 1

Title Slide

Welcome to the tutorial on Example Scripts and Demo Folder.
Slide Number 2

Learning Objectives

In this tutorial, we will learn,
  • About gnuplot terminal and the graphics interface
  • About the demo folder of gnuplot
  • About example script files and
  • To load the script file to generate a graph
Slide Number 3

System and Software Requirement

To record this tutorial, I am using
  • Debian Linux 9.3
  • gnuplot 5.2.6
  • gedit text editor 3.22
  • Firefox web browser 52.5


  • Working Internet connection to access online script files
Slide Number 4


To follow this tutorial,

learner must be familiar with high school level Mathematics.

Slide Number 5

Extract gnuplot-5.2.6 folder

At the time of installation, we downloaded and extracted the gnuplot folder.

Generally, the folder gnuplot-5.2.6 would be in the Downloads folder.

Slide Number 6

Extract gnuplot-5.2.6 folder

If you had saved it elsewhere, then use that location for the next steps.
Slide Number 7

Missing gnuplot folder

What should you do in case the gnuplot folder is missing on your machine?

You have to follow the steps explained in the prerequisite tutorials in this series.

Open file manager, go to Downloads, gnuplot-5.2.6 and demo folder Open file manager.

In my machine, this icon is located on the menu bar at the bottom.

Click on the File Manager icon.

Navigate to Downloads, gnuplot-5.2.6 and then to demo folder.

Scroll/highlight Notice the various files in the folder.
Press Ctrl+Alt+T keys We will now open a terminal by pressing Ctrl, Alt and T keys simultaneously.
cd Downloads/gnuplot-5.2.6/demo Type cd space Downloads slash gnuplot-5.2.6 slash demo and press Enter.

We are in the demo directory, which contains the example files.

Type ls and press enter Type ls to list the files in the demo directory.
Hover mouse over the .dem extension files Notice there are several files with dot dem extension.
Scroll up They are simple text scripts, which are used to generate plots.
Ctrl shift k on rdp machine Let me clear the screen.
Cursor on the interface. Now let's look at the structure of an example script using a text editor.

I will use gedit text editor. You can use any other editor of your choice.

Type gedit simple.dem and press enter Type gedit space simple dot dem and press Enter.

Windows users may open the file in Notepad.

Cursor in the text editor. The script file opens in the text editor window.
Hover mouse near required files in header.

Hover mouse next to the three functions in plot command.

Details about this plot are mentioned in the header.

The required data files are also mentioned.

This script plots three functions together.

Hover mouse next to left and right key in script Scroll down to view the entire file.

This is the structure of a script file.

Close gedit Now, close the text editor window.
Go to terminal. Go to the terminal.
Cursor on the terminal Next, let's run this script in gnuplot and generate the plot.
Type >gnuplot

Press enter

In the terminal, type gnuplot and press Enter.
Hover mouse near gnuplot prompt The prompt changes to gnuplot prompt.

To execute a command in the terminal, press Enter after typing it. I will not mention this separately.

Ctrl shift k on rdp machine I will clear the terminal.
>load 'simple.dem' To load the script, type load space within single quotes simple dot dem
Click on graphics window. A graphical window opens.

Click on this graphics window to activate it.

Hover mouse next to sin(x), atan(x) and cos(atan(x)) Three functions, sin x, atan x and cos atan x are plotted.
Scroll further in axis limits Using arrow keys, scroll, left, right, up and down within the plot.

Doing this allows us to scroll further in the axis limits.

Hover mouse next to “press enter to continue” and press enter Simple dot dem can plot many graphs.

Go through the script file again, at this stage.

Go to terminal To see the next plot, do the following.
  • Go to the terminal by clicking on it.
  • We can read a message Hit return to continue.
Hit return and click on Graphics window. Press the Enter key to continue.

Click on this graphics window.

From now on, you have to do this every time to get the next plot.

Show the change in graphics window Immediately, the next script and it's function gets plotted.
Press enter in terminal Press Enter again, as shown in the prompt to plot the other functions from the script.
Show graphics window. Likewise, you can scroll through some more example files in the demo directory.
Press Ctrl + C Press Ctrl and C keys in the terminal, to come back to the gnuplot prompt.
Close graphical window Now I will close this graphical window.
Cursor on the terminal. Now, I will open a 3D plot example file.
load ‘hidden2.dem’ and enter Load the hidden2 dot dem file on the terminal.

Use the command as shown before to load the script file.

Show the graph A graphics window opens.
Go terminal press enter, view graph , repeat for 3 graphs Go through the 3 examples of the 3D plots this script can generate.
Close the graphics terminal. Then close the graphics window.
Cursor on the terminal. I encourage you to try other example files in this folder.
Press q Type q to exit gnuplot.
Open web browser. Many example scripts are available online for gnuplot, as well.
Open web browser. I will show how to access the example files online in the next step.

I will open a web browser.

Go to, gnuplot.sourceforge.net/demo In the web browser, go to the URL as shown here.
Scroll down and show Notice that there are several examples available for users to learn from.
Hover mouse over the routines 2D and 3D graphs, histograms and curve fitting are few capabilities of the software.
Click on Simple functions Under Basic 2D plot styles, click on the simple functions link.
Hover mouse over graph, pan right The left side shows the graphical plots.

The simple scripts on the right side generate the plots.

Scroll down left pan. Scroll down the page and notice the various styles seen in the plots on the left side.
Hover mouse over graph Notice the variations in symbols, color, legends, line style and filling area.
Cursor on the page. Learners may use this page to learn the various commands and options.
Slide Number 8

Help Forum

If we need help at any time, we can go to this URL


Browser >> https://sourceforge.net/p/gnuplot/discussion/

Point to the Register link at the top left.

Here we can see previously asked questions and the corresponding replies.

We can also post our questions and doubts after we register.

Slide Number 9


Now let's summarize.

In this tutorial, we learned

  • About gnuplot terminal and the graphics interface
  • About the demo folder of gnuplot
  • About example script files and
  • Loaded the script file to generate a graph

Slide Number 10


For assignment activity, please do the following:
  • Open some more example files of your choice, in gnuplot
  • Observe the graphic output and the variations in plot styles.
Slide Number 11

Spoken Tutorial Project

This video summarises the Spoken Tutorial Project

Please download and watch it.

Slide Number 12

Spoken Tutorial workshops

The Spoken Tutorial Project Team conducts workshops and gives certificates.

For more details, please write to us.

Slide Number 13

Forum for specific questions:

Post your timed queries in the forum.
Slide Number 14


Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.
This is Rani from IIT Bombay. Thank you for joining.

Contributors and Content Editors

Madhurig, Ranipv076, Snehalathak