如何向 Python plt.title 添加变量？
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How to add a variable to Python plt.title?
提问by JoeHymanJessieJames
I am trying to plot lots of diagrams, and for each diagram, I want to use a variable to label them. How can I add a variable to plt.title?For example:
我正在尝试绘制大量图表，对于每个图表，我想使用一个变量来标记它们。如何将变量添加到plt.title?例如：
import numpy as np
import matplotlib.pyplot as plt
plt.figure(1)
plt.ylabel('y')
plt.xlabel('x')
for t in xrange(50, 61):
plt.title('f model: T=t')
for i in xrange(4, 10):
plt.plot(1.0 / i, i ** 2, 'ro')
plt.legend
plt.show()
In the argument of plt.title(), I want tto be variable changing with the loop.
在 的参数中plt.title()，我想t随着循环而变化。
回答by DavidG
You can change a value in a string by using %. Documentation can be found here.
For example:
例如：
num = 2
print "1 + 1 = %i" % num # i represents an integer
This will output:
这将输出：
1 + 1 = 2
1 + 1 = 2
You can also do this with floats and you can choose how many decimal place it will print:
您也可以使用浮点数来执行此操作，并且您可以选择要打印的小数位数：
num = 2.000
print "1.000 + 1.000 = %1.3f" % num # f represents a float
gives:
给出：
1.000 + 1.000 = 2.000
1.000 + 1.000 = 2.000
Using this in your example to update tin the figure title:
在您的示例中使用它来更新t图标题：
plt.figure(1)
plt.ylabel('y')
plt.xlabel('x')
for t in xrange(50,61):
plt.title('f model: T=%i' %t)
for i in xrange(4,10):
plt.plot(1.0/i,i**2,'ro')
plt.legend
plt.show()
回答by thewaywewere
You can use print formatting.
您可以使用打印格式。
plt.title('f model: T= {}'.format(t))orplt.title('f model: T= %d' % (t))# c style print
plt.title('f model: T= {}'.format(t))或者plt.title('f model: T= %d' % (t))# c 风格打印
回答by RandomUser123
You can also just concatenate the title string:
您也可以只连接标题字符串：
x=1
y=2
plt.title('x= '+str(x)+', y = '+str(y))
will make the title look like
将使标题看起来像
x= 1, y = 2
x= 1, y = 2
