How do I draw a chart with lines through various points, using matplotlib.pyplot?

Question

I am new to Python. I borrowed this code from an example, and put in my own numbers:

import matplotlib.pyplot as plt

plt.plot(1, 9, 'rs', 2, 8, 'bs', 7, 3, 'g^', 9, 1, 'r^')
plt.title('Chart of 4 companies')
plt.axis([0, 12, 0, 12])
plt.grid(True)
plt.show()

This works great, it shows me a chart, and it shows 4 points on the chart. But is it possible to show the line going from point [0,0] to these lines? I wanted to make a point about cosine similarity, but I am failing badly.

ImportanceOfBeingErnest · Accepted Answer · 2016-11-07 21:53:04Z

2

In case you want a straight line from (0,0) to a point (x,y) you can plot it simply via

plt.plot([0,x],[0,y])

So the whole code may look like this

import matplotlib.pyplot as plt

plt.plot(1, 9, 'rs', 2, 8, 'bs', 7, 3, 'g^', 9, 1, 'r^')
plt.plot([0,1], [0,9], 'r')
plt.plot([0,2], [0,8], 'b')
plt.plot([0,7], [0,3], 'g')
plt.plot([0,9], [0,1], 'r')
plt.title('Chart of 4 companies')
plt.axis([0, 12, 0, 12])
plt.grid(True)
plt.show()

answered Nov 7, 2016 at 21:53

ImportanceOfBeingErnest

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