Create Simple Graph in python using matplotlib.pyplot

Matplotlib : Simple Graph

If you don't know about Matplotlib then you can click here .

Hey Guys

In this Article I am going to show you how you can create Simple graphs in python using matplotlib.pyplot .

so a simple graph is just a representation of you data using a line which moves upward or downwards according to the values passed on X and Y axis.

The above image is an example of a simple graph created using Matplotlib .

so let get started .

1. create a simple graph .

CODE.

# simple graph using matplotlib
import matplotlib.pyplot as plt 
x = [2,5,8,9]
y = [4,6,9,10]
# ploting our canvas
plt.plot(x,y)
# showing what we plotted
plt.show()

Output.

The above code will open a small GUI window in which you can see various buttons which can help you to do some basic operations on the graph .

.

Working of code .

In the first line i imported matplotlib.pyplot as plt ( as you know we have to import library before working on it  ).

in the line 2 & 3 we created 2 list of name X and Y which are used as an argument while creating graph .

Note . ( the length of both X and Y list should be same always if not then it generates errors)

after that i called a plot which is used to create a simple bar graph in Matplotlib .

and using plt.show method the graph will show .

2. Adding title , Label of axis .

CODE.

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import matplotlib.pyplot as plt x = [2,5,8,9] y = [4,6,9,10] # ploting our canvas plt.plot(x,y) # Adding title and label of axis plt.title('Simple Plot') plt.xlabel('X Axis') plt.ylabel('Y Axis') # showing what we plotted plt.show()

Output.

As you can see now the graph appears with a title ( Simple plot ) and both axis now have labels .

3. Line color, width and style.

CODE.

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import matplotlib.pyplot as plt x = [2,5,8,9] y = [4,6,9,10] # ploting our canvas plt.plot(x,y,'green',linestyle='--',label='line one',linewidth=3) plt.legend() plt.show()

Output.

Instead of using full color name you can also pass the first word of color name , like for red color line pass just " r "

and for black pass " k " .

.legend( ) ? 

The best part of matplotlib.pyplot is that the method names and attributes are user friendly means any one can understand the working of a particular method just by reading its name but what is the use of Legend () method because its name is not look very useful to us to understand its working .

So let me help you , if you see the last image of graph you can see a rounded corner box at top left corner which helps you to understand which color line denotes which data .

legend method is very helpful when you are presenting more then one data in a single graph .

line styles available are:  '-', '--', '-.', ':', 'None', ' ', '', 'solid', 'dashed', 'dashdot', 'dotted' .

4. Plotting two or more graphs.

CODE.

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import matplotlib.pyplot as plt x1 = [5,8,10] y1 = [12,16,6] x2 = [6,9,11] y2 = [6,15,7] # ploting graph 1 plt.plot(x1,y1,'g',label='line one') # ploting graph 2 plt.plot(x2,y2,'r',label='line two') plt.legend() plt.show()

Output.

As you can see now we have two lines which represents two different data and the legend method is helpful for finding which line represents which data .

This blog is contributed by Yogesh singh .

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Thank you.