绘制简单的2D向量

Question

New to Python and just trying to accomplish what I think must be the simplest of tasks: plotting a basic 2D vector. However my online search has gotten me nowhere so I turn to stackoverflow with my very first question.

I Just want to plot a single 2D vector, let's call it my_vector. my_vector goes from (0,0) to (3,11).

What I have done is this:

from __future__ import print_function
import numpy as np
import pylab as pl
%pylab inline

x_cords = np.arange(4)
y_cords = np.linspace(0, 11, 4)
my_vector = vstack([x_cords, y_cords])
fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot(my_vector)
plt.show()

Which gives the following image (and totally not what I am after):

a very wrong plot

However I have found that

ax.plot(x_cords, y_cords)

instead of

ax.plot(my_vector)

gives me the plot I am looking for but then I don't have that single vector I am after.

So how does one correctly plot a basic 2D vector? Thank you and sorry if this has indeed been posted somewhere else...

Answer 1

You can also unpack your 2D vector

pl.plot(*my_vector)

Which is effectively just doing

pl.plot(x_cords, y_cords)