在python中使用matplotlib的胖子乐队

问题描述

我想在python中使用matplotlib绘制一条厚度变化的线.

I would like to plot a line with varying thickness using matplotlib in python.

更清楚地说，我有以下变量

To be clearer, I have the following variable

import matplotlib.pyplot as P
import numpy as N

x_value = N.arange(0,10,1)
y_value = N.random.rand(10)
bandwidth = N.random.rand(10)*10
P.plot(x_value,y_value,bandwidth)

我想用 x_value 和 y_value 绘制一条线，其厚度随 x_value 位置变化并由带宽向量给出.

I would like to plot a line with x_value and y_value and a thickness that vary with the x_value position and given by the bandwidth vector.

我看到的一个可能的解决方案是绘制上下线(即，我采用y_value [index] + -widthband [index]/2并绘制这两条线.

A possible solution that I see would be to draw the upper and lower line (i.e. I take y_value[index] +- bandwidth[index]/2 and plot those two lines.

然后我可以尝试填充两行之间的空间(如何?)

Then I could try to fill the space between the two lines (how?)

如果您有任何建议?

谢谢

塞缪尔.

推荐答案

您可以使用 fill_between .

You can do this using fill_between.

例如，要使 bandwidth 上一半，下一半(并且还使用 plot 绘制原始线):

For example, to have half the bandwidth above and half below (and also drawing the original line using plot):

import matplotlib.pyplot as P
import numpy as N

x_value = N.arange(0,10,1)
y_value = N.random.rand(10)
bandwidth = N.random.rand(10)*10
print bandwidth
P.fill_between(x_value, y_value+bandwidth/2, y_value-bandwidth/2, alpha=.5)
P.plot(x_value,y_value)
P.show()

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