Difference between revisions of "Gnuplot/C2/Multiple-plots-in-a-canvas/English"
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|| '''Slide Number 1''' | || '''Slide Number 1''' | ||
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'''Title Slide ''' | '''Title Slide ''' | ||
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'''Multiple plots in a canvas''' | '''Multiple plots in a canvas''' | ||
|| Welcome to the tutorial on '''Multiple plots in a canvas'''. | || Welcome to the tutorial on '''Multiple plots in a canvas'''. | ||
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|| '''Slide Number 2''' | || '''Slide Number 2''' | ||
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'''Learning Objectives''' | '''Learning Objectives''' | ||
|| In this tutorial we will learn to, | || In this tutorial we will learn to, | ||
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|| '''Slide Number 3''' | || '''Slide Number 3''' | ||
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'''Learning Objectives''' | '''Learning Objectives''' | ||
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|| '''Slide Number 4''' | || '''Slide Number 4''' | ||
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'''Pre-requisites''' | '''Pre-requisites''' | ||
|| To record this tutorial, I am using, | || To record this tutorial, I am using, | ||
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|| '''Slide Number 5''' | || '''Slide Number 5''' | ||
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'''System and Software Requirement''' | '''System and Software Requirement''' | ||
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[https://spoken-tutorial.org/ https:spoken-tutorial.org] | [https://spoken-tutorial.org/ https:spoken-tutorial.org] | ||
|| To follow this tutorial, | || To follow this tutorial, | ||
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|| '''Slide Number 6''' | || '''Slide Number 6''' | ||
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'''Code files''' | '''Code files''' | ||
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|| Press '''Ctrl+Alt+T'''. | || Press '''Ctrl+Alt+T'''. | ||
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Enter the command '''cd Desktop'''. | Enter the command '''cd Desktop'''. | ||
|| Open a '''terminal''' and change the directory to '''Desktop'''. | || Open a '''terminal''' and change the directory to '''Desktop'''. | ||
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|| Press '''ctrl+S'''. | || Press '''ctrl+S'''. | ||
− | || Press '''ctrl S''' to open the file '''save as''' | + | || Press '''ctrl S''' to open the file '''save as''' dialog box. |
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|| '''Slide Number 7''' | || '''Slide Number 7''' | ||
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'''Summary''' | '''Summary''' | ||
|| Now, to summarize, in this tutorial, we | || Now, to summarize, in this tutorial, we | ||
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|| '''Slide Number 8''' | || '''Slide Number 8''' | ||
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'''Assignment 1''' | '''Assignment 1''' | ||
|| For assignment activity, please do the following. | || For assignment activity, please do the following. | ||
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|| '''Slide Number 9''' | || '''Slide Number 9''' | ||
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'''Assignment 2''' | '''Assignment 2''' | ||
|| With the file '''data.txt''', that is provided, do the following. | || With the file '''data.txt''', that is provided, do the following. | ||
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|| '''Slide Number 10''' | || '''Slide Number 10''' | ||
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'''Spoken Tutorial Project''' | '''Spoken Tutorial Project''' | ||
|| This video summarises the '''Spoken Tutorial Project''' . | || This video summarises the '''Spoken Tutorial Project''' . | ||
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|| '''Slide Number 11''' | || '''Slide Number 11''' | ||
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'''Spoken Tutorial workshops''' | '''Spoken Tutorial workshops''' | ||
|| We conduct workshops and give certificates. | || We conduct workshops and give certificates. | ||
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|| '''Slide Number 12''' | || '''Slide Number 12''' | ||
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'''Forum for specific questions:''' | '''Forum for specific questions:''' | ||
|| Post your timed queries in the '''forum'''. | || Post your timed queries in the '''forum'''. | ||
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|| '''Slide Number 13''' | || '''Slide Number 13''' | ||
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'''Acknowledgement''' | '''Acknowledgement''' | ||
|| '''Spoken Tutorial Project''' is funded by '''MHRD''', '''Government of India'''. | || '''Spoken Tutorial Project''' is funded by '''MHRD''', '''Government of India'''. |
Latest revision as of 12:17, 20 April 2023
Visual Cue | Narration |
Slide Number 1
Title Slide Multiple plots in a canvas |
Welcome to the tutorial on Multiple plots in a canvas. |
Slide Number 2
Learning Objectives |
In this tutorial we will learn to,
|
Slide Number 3
Learning Objectives |
|
Slide Number 4
Pre-requisites |
To record this tutorial, I am using,
|
Slide Number 5
System and Software Requirement |
To follow this tutorial,
|
Slide Number 6
Code files |
|
Press Ctrl+Alt+T.
Enter the command cd Desktop. |
Open a terminal and change the directory to Desktop.
I will demonstrate the multiplot command, with four graphs in one canvas. |
Type gedit &. | Type gedit space ampersand.
The ampersand makes the process run in the background. It detaches the process from the terminal.
|
Press Enter. | Press Enter to open gedit.
Windows users may use notepad or wordpad. We will write the required commands in a text file. |
Type, #my first multiplot and press Enter. | I will type hash my first multiplot and press Enter.
This is a comment line. |
Type set multiplot, press Enter. | Next, set the environment to multiplot mode, as set space multiplot.
Start a new line and leave a blank line for clarity. |
Cursor on gedit window. | We will plot, sin x, cos x, a straight line and an exponential decay graphs. |
Type header line,
#x-sin(x) plot |
I will start with the script for the sin(x) part.
In the next line, enter a comment to identify that, the plot is for sin x. |
Type lines,
set origin 0,0 set size 0.5, 0.5 |
Enter the next two commands as shown here.
They define the size and placement for the sin x plot. |
Hover mouse next to set origin 0,0 . | This plot is set at position zero, zero which is the origin.
This is the left hand bottom corner of the page. |
Hover mouse next to set size 0.5,0.5 . | Here I am specifying plot size to be a square of point 5 by point 5.
This size is relative to the total page size and makes it a quarter of the page. |
Type the following lines,
set xrange[-10:10] yrange[-2:2] set title '”x-sin(x) plot” |
We will set x and y range and title for the sin (x) plot.
These are the graph formatting details for the sin x plot. |
Type plot sin(x) and press Enter. | We will then issue the plot command for sin(x). |
Type,
# cos (x) - x plot |
I will enter details for the second plot, which is cos (x).
First, write a comment line, to indicate it is the part for cos (x), in the script. Type hash cos x-x plot. |
Type the lines,
set origin 0.5,0.0 set size 0.5, 0.5 set xrange[-10:10] set yrange[-2:2] set title "x-cos(x) graph" plot cos(x) notitle |
Enter the commands as shown here.
Pause the video as and when necessary. |
Hover mouse next to set origin and set size. | Here, I specify the position and size of the second plot.
The position is set to the right side of the sin x plot. |
Show the data.txt file icon in Desktop. | I will use the data from the text file data.txt, for the third and fourth plots.
This file is provided to you in the Code files link of this tutorial. |
Show screenshot of file on Desktop. | I have downloaded and saved the file on Desktop. |
Show screenshot of the file. | The file has 3 data columns, x , y1 and y2 . |
Type
#straight line plot |
Now, I will enter the details for the third plot.
Write a comment, starting with a hash. Type, straight line plot and press Enter. |
Type the lines,
set origin 0.5,0.5 set size 0.5, 0.5 |
Again specify the size and position for this graph.
This position places the graph in the top right corner. |
Type the lines,
set title "straight line" set xrange[*:*] set yrange[*:*] plot 'data.txt' using 1:3 with linespoint notitle and press Enter. |
Enter the commands as shown here.
Specify the title, autoscale axis range and issue the plot command. |
Hover mouse over 1:3 in the plot command. | The 3rd column in the data file is the y data values for the straight line plot. |
Cursor in gedit window. | Pause the video when required to enter the commands. |
Hover mouse over origin, xrange and yrange. | Here, I am specifying autoscale for axes range. |
Hover mouse next to 1:3 .
Hover mouse next to notitle. |
Here I am using column 1 for x data and column 3 for y data.
Here I also specify, no legend title is required in the plot. |
Cursor in gedit window. | Let's write the part of script to generate the exponential decay plot. |
Type, #exponential decay and
press Enter. |
I will type hash exponential decay for the comment line. |
Type,
set origin 0.0,0.5 and press Enter. |
For this plot, set the position above the sin x plot in the top left corner. |
Type,
set size 0.5, 0.5 set title "Exponential decay" set autoscale plot 'data.txt' using 1:2 with linespoint notitle and press Enter. |
Set size, title for graph and auto-scale the data.
Read in the columns for x and y data from the data file in the plot command. Here, it is column 1 and column 2 for x and y data. |
Press Enter.
Type unset multiplot and press Enter. |
I will leave an blank line after this.
Finally, unset the multiplot mode with the command, unset space multiplot. |
Press ctrl+S. | Press ctrl S to open the file save as dialog box. |
Type filename as, multiplot.dem
Click on save. |
Save the file in Desktop directory with filename multiplot.dem.
Click on save to save the script. |
Minimize gedit. | Minimize the gedit window. |
Go to the terminal. | Go to the terminal. |
Type gnuplot and press Enter. | Let’s open gnuplot. |
Press Ctrl+L . | I will also clear the screen. |
Cursor in the terminal. | Let's run the script to generate the multiplot. |
Type load 'multiplot.dem' and press Enter. | Enter the command, load space in single quotes, multiplot.dem. |
Show the graphics window with 4 plots. | A graphic window with four graphs appear in the canvas. |
Show multiplot mode terminal prompt video patch from another terminal. | In case of errors in the script, gnuplot will remain in the multiplot mode. |
Type unset space multiplot and press Enter. | Then the graphics plot is also not generated.
If so, type unset space multiplot. |
Cursor on the terminal. | To reset default setting, the unset command is used.
If we do not unset the format, the set format will not reset to default setting. |
Hover mouse next to gnuplot prompt. | This returns the terminal to gnuplot prompt.
Debug the script to make it error free and run the script to generate the plot. |
Go to the graphics window. | A few formatting modifications could improve the look of the graphs. |
Close the graphics window. | Hence, I will make the following modifications in the script.
Close the graphics window. |
Go back to gedit script. | Go back to the gedit window to edit the script.
If you had closed it, please open the script file to edit it further. |
Scroll to the sin(x) script part.
Start a new line before plot command. |
Scroll to the sin x part of the script.
Let's change the background color of the sin x plot. Start a new line before the plot command. |
Type
set object 1 rectangle from graph 0,0 to graph 1,1 behind fillcolor rgb 'cyan' fillstyle solid noborder and press Enter. |
To change the background color, we will insert an object, in the graph.
Enter the command as seen on the screen. |
Hover mouse next to object, cyan and noborder. | Here, we have set a cyan colored rectangle, without border, for the background. |
Start a new line after the plot command.
Type, unset object 1 and press Enter. |
Start a new line after the plot command.
Unset the cyan background object, as shown here. |
Type in the three lines above the plot command line,
set format y "10^{%L}" set xtics rotate set ytics 40000 and press Enter. |
For the straight line plot, add modifications on axis formats.
The y axis numbers are large. |
Point mouse to set format y, then to xtics rotate and then ytics 40000. | The y axis numbers are large.
So I will change the notation. I will also rotate the x axis tics in the plot. I also specify the y tics spacing. |
Type unset format y . | We will unset the y axis format after the plot command is executed. |
Scroll down the script file. | Next go to the part of the exponential decay script. |
Before the plot command, type in the three lines,
set format y "10^{%L}" set xtics rotate set ytics 40000 Press Enter. |
I will add the same formatting commands, as shown in the straight line plot.
Notice that, they are added before the plot command. |
Type, unset format y after the plot command. | Start a new line after plot command and unset the format of y-axis. |
Scroll to top of the script. | Let's add commands to print the graph into an image file.
Scroll up to the top of the script file. |
Before the set multiplot line, type,
set terminal svg size 800,800 enhanced font 'Verdana,12' |
Type set term to svg as seen before starting the multiplot mode. |
Type
set output 'multiplot.svg' and press Enter. |
Direct the output to a svg file as seen.
These are done before the multiplot command is executed. |
Scroll to the bottom of the script. | Scroll to the bottom of script file and unset the output.
This is done after before we unset the multiplot mode. |
Type unset output and press Enter. | Enter the command unset space output. |
Press Ctrl+S and minimize gedit. | Press Ctrl+S to save the file and minimize gedit. |
Go to the terminal. | Go back to the terminal from where gnuplot was opened.
If you had closed gnuplot, please open gnuplot again. |
Enter the command load 'multiplot.dem' . | Run the updated multiplot.dem script.
Now, the graphics window does not open, since the output is a svg file. |
Enter the command quit. | Enter the command quit, to quit gnuplot. |
Go to Desktop. | Go to Desktop. |
Open multiplot.svg file. | Open the file, multiplot.svg that is created on the Desktop.
Since the path is Desktop the output file is generated in the Desktop directory. |
Cursor on the svg file. | You may add commands to the script to generate the desired output. |
Close the image file. | Similar scripts are available in the gnuplot demo website.
Practise and familiarize with the commands and styles. |
Slide Number 7
Summary |
Now, to summarize, in this tutorial, we
|
Slide Number 8
Assignment 1 |
For assignment activity, please do the following.
|
Slide Number 9
Assignment 2 |
With the file data.txt, that is provided, do the following.
|
Show assignment result screenshot. | The completed assignment looks similar to this. |
Slide Number 10
Spoken Tutorial Project |
This video summarises the Spoken Tutorial Project .
Please download and watch it. |
Slide Number 11
Spoken Tutorial workshops |
We conduct workshops and give certificates.
For more details, please write to us. |
Slide Number 12
Forum for specific questions: |
Post your timed queries in the forum. |
Slide Number 13
Acknowledgement |
Spoken Tutorial Project is funded by MHRD, Government of India. |
This is Rani from IIT, Bombay.
Thank you for joining. |