How to plot two lists of tuples with Matplotlib

Question

I have two lists where each element is a tuple that should be interpreted as

x = [(x1_begin, x1_end), (x2_begin, x2_end), ... , (xn_begin, xn_end)]
y = [(y1_begin, y1_end), (y2_begin, y2_end), ... , (yn_begin, yn_end)]

In one figure, I would like to plot all these points and draw lines only between (yi_begin, yi_end) vs (xi_begin, xi_end) for all i.

The following code manages to plot all the points. But I'm not sure how to draw the lines properly between the points. Any help is much appreciated.

import matplotlib.pyplot as plt

x = [(1, 27), (32, 55), (56, 80), (84, 103)]
y = [(5, 7), (3, 6), (4, 9), (6, 11)]

fig = plt.figure()
ax = fig.add_subplot(111)
ax.scatter(x, y, color='black')
plt.show()

I am a bit confused. Is your x and y corresponding to coordinates on the x, y axis? — Spinor8
– Spinor8, Commented Aug 5, 2018 at 8:59
@Spinor8 yes, so the range of the x-axis should be 1 to 103, and of the y-axis 3 to 11. I hope that clarifies your question? — Hunter
– Hunter, Commented Aug 5, 2018 at 9:02
So your data is essentially: list_1 = [(line1_start_x, line1_end_x) ,.... ] and list_2 = [(line1_start_y, line1_end_y) ....], right? — Spinor8
– Spinor8, Commented Aug 5, 2018 at 9:06
(yi_begin, yi_end) vs (xi_begin, xi_end) means a line between (xi_begin,yi_begin) to (xi_end,yi_end) ? — Bal Krishna Jha
– Bal Krishna Jha, Commented Aug 5, 2018 at 9:08
Also, seems like a duplicate of this question. Please use search before posting. — Maksim Terpilovskii
– Maksim Terpilovskii, Commented Aug 5, 2018 at 9:20

Maksim Terpilovskii · Accepted Answer · 2018-08-05 09:18:00Z

2

Iterate over your tuples:

import matplotlib.pyplot as plt

x = [(1, 27), (32, 55), (56, 80), (84, 103)]
y = [(5, 7), (3, 6), (4, 9), (6, 11)]

fig = plt.figure()
ax = fig.add_subplot(111)
for xt, yt in zip(x,y):
    ax.plot(xt, yt, color='black')
plt.show()

answered Aug 5, 2018 at 9:18

Maksim Terpilovskii

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Spinor8 · Accepted Answer · 2018-08-05 09:15:30Z

1

If indeed you are asking for one line per tuple, here's the code.

fig = plt.figure()
ax = fig.add_subplot(111)
assert len(x) == len(y)
for i in range(len(x)):
    plt.plot(x[i], y[i])
plt.show()

giving you

answered Aug 5, 2018 at 9:15

Spinor8

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