Python-3.4.3/C2/Other-Types-Of-Plots/English

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 equal to 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, Plot a scatter plot using scatter() function Plot a log-log graph using loglog() function
Show Slide Assignment	Here are some self assessment questions for you to solve. 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 d does exactly the same? True or False
Show Slide Solution to assignment	And the answer, 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.

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