添加输入变量以在Python中绘制标题/传奇 [英] Adding input variables to plot title/legend in Python

问题描述

我想在绘图标题/图例/注释文本中显示用于绘图特定功能的参数的当前值.作为一个简单的例子，让我们走一条直线:

I would like to display the current value of a parameter used to plot a certain function in the plot title/legend/annotated text. As a simple example, let's take a straight line:

import numpy
import matplotlib.pyplot as plt

def line(m,c):
   x = numpy.linspace(0,1)
   y = m*x+c
   plt.plot(x,y)
   plt.text(0.1, 2.8, "The gradient is" *the current m-value should go here*)
   plt.show()

print line(1.0, 2.0)

在这种情况下，我希望我的文字说渐变为1.0"，但是我不确定语法是什么.此外，我将如何在下面添加第二个(和更多个)参数，使其显示为:

In this case, I would like my text to say "The gradient is 1.0", but I'm not sure what the syntax is. Moreover, how would I include the second (and more) parameter(s) below, so that it reads:

渐变为1.0

截距是2.0."

推荐答案

通过 .format()方法使用字符串格式:

Use string formatting with the .format() method:

plt.text(0.1, 2.8, "The gradient is {}, the intercept is {}".format(m, c))

其中 m 和 c 是要替换的变量.

Where m and c are the variables you want to substitute in.

如果在字符串前加上 f 作为前缀，则可以直接在 Python 3.6 + 中编写这样的变量，

You can directly write the variables like this in Python 3.6+ if you prefix the string with an f whcih denotes a formatted string literal:

f"the gradient is {m}, the intercept is {c}"

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