16

I have a bunch of points that I am trying to plot using matplotlib. For each point (a,b) I want to draw the line X = a for Y in [0,b]. Any idea how to do this?

Improve this question

2 Answers 2

Reset to default
20

Use a stem plot

The least cumbersome solution employs matplotlib.pyplot.stem

import matplotlib.pyplot as plt
x = [1. , 2., 3.5]
y = [2.3, 4., 6.]
plt.xlim(0,4)
plt.stem(x,y)
plt.show()

enter image description here

Improve this answer
Sign up to request clarification or add additional context in comments.

Comments

16

You just draw each line using the two endpoints. A vertical line X=a for Y in [0,b] has endpoints (x,y) = (a,0) and (a,b). So:

# make up some sample (a,b): format might be different to yours but you get the point.
import matplotlib.pyplot as plt
points = [ (1.,2.3), (2.,4.), (3.5,6.) ] # (a1,b1), (a2,b2), ...

plt.hold(True)
plt.xlim(0,4)  # set up the plot limits

for pt in points:
    # plot (x,y) pairs.
    # vertical line: 2 x,y pairs: (a,0) and (a,b)
    plt.plot( [pt[0],pt[0]], [0,pt[1]] )

plt.show()

Gives something like the following: drawing vertical lines

Improve this answer

Comments

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.