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up vote 0 down vote favorite 
X = np.array([[-1, 1], [-2,-1], [-3, -2], [1, 1], [2, 1], [3, 2]])
plt.plot(X)
plt.show()

If I plot this the first element in each list is Y and the second is X. So for [-1, 1], -1 is Y and 1 is X. Why is this the default and what's the best way to change it?

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1 Answer 1

up vote 1 down vote accepted

This is the default because (from the help):

If *x* and/or *y* is 2-dimensional, then the corresponding columns
will be plotted.

You could do, instead, 

import numpy as np
import matplotlib.pyplot as plt
X = np.array([[-1, 1], [-2,-1], [-3, -2], [1, 1], [2, 1], [3, 2]])
plt.plot(X.T[0], X.T[1])
plt.show()

which starts at (-1,1) and winds up at (3,2).

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