Matplotlib:从x轴到点画线 [英] Matplotlib: Draw lines from x axis to points

问题描述

我想尝试使用matplotlib绘制很多点.对于每个点 (a,b)，我想在 [0,b] 中为 Y 绘制线 X = a.任何想法如何做到这一点?

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?

推荐答案

您只需使用两个端点绘制每条线.[0，b]中Y的垂直线X = a具有端点(x，y)=(a，0)和(a，b).所以:

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()

给出以下内容:

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