Difference between revisions of "Python-3.4.3/C2/Other-Types-Of-Plots/English"

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(Created page with "'''lPython/C2/Other-types-of-plots/English''''''Title of script''': '''Other types of plots. ''' '''Author: Anoop Jacob Thomas, Thirumalesh H S''' '''Keywords: Python, IPyth...")
 
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'''lPython/C2/Other-types-of-plots/English''''''Title of script''': '''Other types of plots. '''
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'''lPython/C2/Other-types-of-plots/English'''
 +
 
 +
 
 +
'''Title of script''': '''Other types of plots. '''
  
 
'''Author: Anoop Jacob Thomas, Thirumalesh H S'''
 
'''Author: Anoop Jacob Thomas, Thirumalesh H S'''
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Type '''%pylab '''and press''' Enter.'''
+
Type ''percent '''''pylab '''and press''' Enter.'''
  
 
|-
 
|-
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Exercise 1
 
Exercise 1
| style="background-color:#ffffff;border:0.5pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.097cm;padding-right:0.191cm;"| * Plot a '''scatter''' '''plot''' showing the percentage profit of a company A from the year 2000-2010.  
+
| style="background-color:#ffffff;border:0.5pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.097cm;padding-right:0.191cm;"| * Plot a '''scatter''' '''plot''' showing the percentage profit of a company A from the year 2000 to 2010.  
  
* The data for the same is available in the '''file''' '''company-a-data.txt'''.
+
* The data for the same is available in the '''file''' '''company '''''hyphen '''''a '''''hyphen '''''data '''''dot '''''txt'''.
  
* '''company-a-data.txt''' file is available in the code file link of this tutorial.  
+
* '''company '''''hyphen '''''a '''''hyphen '''''data '''''dot '''''txt''' file is available in the code file link of this tutorial.  
  
 
* Please download and use it.
 
* Please download and use it.
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cat '''company-a-data.txt'''
 
cat '''company-a-data.txt'''
| style="background-color:#ffffff;border:0.5pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.097cm;padding-right:0.191cm;"| Let us see the content of the file '''company-a-data.txt'''
+
| style="background-color:#ffffff;border:0.5pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.097cm;padding-right:0.191cm;"| Let us see the content of the file '''company '''''hyphen '''''a '''''hyphen '''''data '''''dot '''''txt'''.
  
 +
So type,
  
'''cat company-a-data.txt '''and''' press Enter'''
+
'''cat company '''''hyphen '''''a '''''hyphen '''''data '''''dot '''''txt'''.''' '''and''' press Enter'''
  
 
|-
 
|-
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The column line represents the years. The column line represents the profit percentage.
+
The first column represents the years. And the second column represents the profit percentage.
  
 
|-
 
|-
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'''year '''''comma''''' profit '''''equal to''''' loadtxt '''''within parentheses within single quotes '''''company-a-data.txt '''''after single quotes comma''''' unpack '''''comma''''' True '''and''' Press Enter'''
+
'''year '''''comma''''' profit '''''equal to''''' loadtxt '''''within parentheses within single quotes '''''company '''''hyphen '''''a '''''hyphen '''''data '''''dot '''''txt '''''after single quotes comma''''' unpack '''''comma''''' True '''and''' Press Enter'''
  
  
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* '''x '''is''' '''a sequence of data
 
* '''x '''is''' '''a sequence of data
* '''y '''is''' '''a sequence of data having same length of '''x'''
+
* '''y '''is''' '''a sequence of data having the same length of '''x'''
  
  
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'''scatter(year, profit)'''
 
'''scatter(year, profit)'''
| style="background-color:#ffffff;border:0.5pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.097cm;padding-right:0.191cm;"| Let us use '''scatter() function '''to '''plot scatter graph '''for data stored in '''year '''and''' profit. '''
+
| style="background-color:#ffffff;border:0.5pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.097cm;padding-right:0.191cm;"| Let us use '''scatter function '''to '''plot scatter graph '''for data stored in '''year '''and''' profit. '''
  
  
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Notice that we passed two arguments to '''scatter() '''function.
 
Notice that we passed two arguments to '''scatter() '''function.
  
First one being the values in x-coordinate '''year.'''
+
First one being the values in x-coordinate that is '''year.'''
  
  
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'''Plot''' a scatter plot of same data in '''company-a-data.txt''' with red diamond markers.
+
'''Plot''' a scatter plot of same data in '''company '''''hyphen '''''a '''''hyphen '''''data '''''dot '''''txt''' with red diamond markers.
  
  
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Exercise 3
 
Exercise 3
| style="background-color:#ffffff;border:0.5pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.097cm;padding-right:0.191cm;"| Plot a '''log-log''''' '''''chart''' of '''y '''''equal to''''' 5 times x(cube)''' for '''x''' from 1 to 20.
+
| style="background-color:#ffffff;border:0.5pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.097cm;padding-right:0.191cm;"| Plot a '''log-log''''' '''''chart''' of '''y '''''equal to''''' 5 times x cube''' for '''x''' from 1 to 20.
  
 
|-
 
|-
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Type''' '''
 
Type''' '''
  
'''x = linspace '''''within parentheses''''' 1 '''''comma '''''20 '''''comma '''''100 '''and''' press Enter'''
+
'''x '''''equalto '''''linspace '''''within parentheses''''' 1 '''''comma '''''20 '''''comma '''''100 '''and''' press Enter'''
  
'''y '''''equal to '''''5 '''''into''''' x '''''raised to''''' 3''' and''' press Enter'''
+
Then''', y '''''equal to '''''5 '''''into''''' x '''''raised to''''' 3''' and''' press Enter'''
  
 
|-
 
|-
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and '''plot '''''within parentheses '''''x '''''comma''''' y '''''comma''''' color '''''equal to within single quotes '''''b '''''comma''''' marker '''''equal to within single quotes '''''d'''does exactly the same.?
 
and '''plot '''''within parentheses '''''x '''''comma''''' y '''''comma''''' color '''''equal to within single quotes '''''b '''''comma''''' marker '''''equal to within single quotes '''''d'''does exactly the same.?
  
* True
+
* True or False
* False
+
  
  
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| style="background-color:#ffffff;border:0.5pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.097cm;padding-right:0.191cm;"| And the answers,
+
| style="background-color:#ffffff;border:0.5pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.097cm;padding-right:0.191cm;"| And the answer,
  
 
# '''False'''. Both functions do not produce the same kind of plot.
 
# '''False'''. Both functions do not produce the same kind of plot.

Revision as of 17:39, 5 September 2017

lPython/C2/Other-types-of-plots/English


Title of script: Other types of plots.

Author: Anoop Jacob Thomas, Thirumalesh H S

Keywords: Python, IPython, pylab, scatter plot, loglog plot, video tutorial


Visual Cue Narration
Show slide


Hello friends. Welcome to the tutorial on Other types of plots
Show slide

Learning Objectives

  • Create scatter plot
  • Create log-log plots


At the end of this tutorial, you will be able to -
  • Create scatter plot
  • Create log-log plots


Show slide

System Specifications

To record this tutorial, I am using
  • Ubuntu Linux 14.04 operating system
  • Python 3.4.3
  • IPython 5.1.0


Show slide

Pre-requisites

  • run basic Python commands on the ipython console
  • Load data from files and
  • Plot data.

If not, see the relevant Python tutorials on http://spoken-tutorial.org


To practice this tutorial, you should know how to
  • run basic Python commands on the ipython console
  • Load data from files and
  • Plot data.

If not, see the relevant Python tutorials on this website.

[Terminal]

ipython3


Let us first open the Terminal by pressing Ctrl+Alt+T keys simultaneously.


Now, type ipython3 and press Enter.

[IPython console]

%pylab and press Enter.

Let us initialise the pylab package.


Type percent pylab and press Enter.

Show Slide

Scatter plot

In a scatter plot, the data is displayed as a collection of points.


Each point determines its position on the x and y axes



Show Slide

Exercise 1

* Plot a scatter plot showing the percentage profit of a company A from the year 2000 to 2010.
  • The data for the same is available in the file company hyphen a hyphen data dot txt.
  • company hyphen a hyphen data dot txt file is available in the code file link of this tutorial.
  • Please download and use it.


In terminal type:

cat company-a-data.txt

Let us see the content of the file company hyphen a hyphen data dot txt.

So type,

cat company hyphen a hyphen data dot txt. and press Enter

Show cat company-a-data.txt output The data file has two columns with a set of values in each column.


The first column represents the years. And the second column represents the profit percentage.

[IPython Terminal]


year, profit = loadtxt('company-a-data.txt', unpack = True)


To produce the scatter plot,


we first need to load the data from the file using loadtxt command.

Type


year comma profit equal to loadtxt within parentheses within single quotes company hyphen a hyphen data dot txt after single quotes comma unpack comma True and Press Enter



Highlight unpack = True unpack equal to True returns the transposed array of data
Show Slide

scatter() function


scatter() function is used to generate the scatter graph


Syntax: scatter within parentheses x comma y

  • x is a sequence of data
  • y is a sequence of data having the same length of x


[IPython Terminal]


scatter(year, profit)

Let us use scatter function to plot scatter graph for data stored in year and profit.


Type scatter within parentheses year comma profit and press Enter.


Notice that we passed two arguments to scatter() function.

First one being the values in x-coordinate that is year.


Second, the values in y-coordinate, the profit percentages.

Show Slide

Exercise

Pause the video here, try out the following exercise and resume the video.


Read the documentation of scatter.


Plot a scatter plot of same data in company hyphen a hyphen data dot txt with red diamond markers.



[IPython Terminal]


clf()

scatter(year,profit,color='r',marker='d')


Solution to Exercise


Clear the plot window by typing clf parentheses and press Enter


Now type

scatter within parentheses year comma profit comma color equal to within single quotes r comma marker equal to within single quotes d and press Enter

Show plot window Thus, we got our scatter plot.


Now let us see another kind of plot.

Show Slide

log-log graph


* A log-log plot is a two-dimensional graph of numerical data.
  • It uses logarithmic scales on both axes.
  • Graph appears as straight line due to non-linear scaling


Show Slide

loglog() function


Syntax

loglog within parentheses x comma y

  • x is a sequence of data
  • y is a sequence of data, having the same length of x


Show Slide

Exercise 3

Plot a log-log chart of y equal to 5 times x cube for x from 1 to 20.
[IPython Terminal]


x = linspace(1,20,100)

y = 5*x**3


Before we actually plot, let us calculate the points needed for that.


Type

x equalto linspace within parentheses 1 comma 20 comma 100 and press Enter

Then, y equal to 5 into x raised to 3 and press Enter

[IPython Terminal]

clf()

loglog(x,y)


Clear the plot window by typing clf parentheses and press Enter


Type loglog within parentheses x comma y and press Enter

Show plot window We see the required plot
Show Slide

Summary


This brings us to the end of this tutorial. In this tutorial we learnt to,


  1. Plot a scatter plot using scatter() function
  1. Plot a log-log graph using loglog() function


Show Slide

Assignment


Here are some self assessment questions for you to solve.
  1. scatter within parentheses x comma y comma color equal to within single quotes blue comma marker equal to within single quotes d

and plot within parentheses x comma y comma color equal to within single quotes b comma marker equal to within single quotes ddoes exactly the same.?

  • True or False


Show Slide

Solution to assignment


And the answer,
  1. False. Both functions do not produce the same kind of plot.


Show Slide

Forum

Please post your timed queries in this forum.
Show Slide

Fossee Forum

Please post your general queries on Python in this forum.
Show Slide

Textbook Companion

FOSSEE team coordinates the TBC project.
Show Slide

Acknowledgment

http://spoken-tutorial.org

Spoken Tutorial Project is funded by NMEICT, MHRD, Govt. of India.

For more details, visit this website.

Previous slide This is _________ from IIT Bombay (or FOSSEE, if you wish) signing off.

Thank you.

Contributors and Content Editors

Nancyvarkey, Nirmala Venkat, Pratham920