英文:
plot coordinates line in a pyplot
问题
我有一个散点图。我想要为每个点绘制坐标线，从X到Y，就像我们在学校时常做的那样。
请参考下面的图片。
我最终使用了"grid()"属性，但那不完全是我想要的。
我还尝试了使用"axhline"和"axvline"，传入xmin、xmax和ymin、ymax，但没有成功。它穿过整个图。
祝你有个美好的一天！
英文:
I have a scatter plot. I would like to plot coordinate lines for each point, from X to Y, just like we used to do on school.
See picture below as a reference.
I ended up using the "grid()" property, but that is not exactly what I want.
I also tried to use "axhline" and "axvline" passing xmin, xmax and ymin, ymax, but it did not work. It crossed a line throughout the entire plot.
Have a great day!
答案1
得分: 2
你可以使用vlines来绘制垂直线，使用hlines来绘制水平线。与axvline和axhline不同的是，这些函数接受在0到1之间的值，而vlines和hlines在数据坐标中工作。我将y.min()作为ymin传递给vlines，以防它太低，将x.min()作为xmin传递给hlines，以防它太靠左。我还调整了散点图的zorder，使线在点的后面。
import numpy as np
import matplotlib.pyplot as plt
plt.close("all")
rng = np.random.default_rng(42)
x = np.arange(2009, 2024)
y = rng.random(x.size)*13
fig, ax = plt.subplots()
ax.scatter(x, y, zorder=3)
ax.vlines(x, y.min(), y, color="r", linewidth=0.5)
ax.hlines(y, x.min(), x, color="r", linewidth=0.5)
fig.show()
英文:
You can use vlines to draw the vertical lines and hlines to draw the horizontal lines. These are different from axvline and axhline, since those functions take values between 0 and 1 while vlines and hlines work in the data coordinates. I pass vlines the y.min() as ymin so it doesn't go too low and I pass hlines the x.min() as xmin so it doesn't go too far to the left. I also adjusted the zorder of the scatter plot so the lines are behind the points.
import numpy as np
import matplotlib.pyplot as plt
plt.close("all")
rng = np.random.default_rng(42)
x = np.arange(2009, 2024)
y = rng.random(x.size)*13
fig, ax = plt.subplots()
ax.scatter(x, y, zorder=3)
ax.vlines(x, y.min(), y, color="r", linewidth=0.5)
ax.hlines(y, x.min(), x, color="r", linewidth=0.5)
fig.show()
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