Matplotlib从文件绘图时Y轴坐标不正确

Posted 2020-10-29 Sherlock-Tang

问题描述：

从文件中读取X坐标和Y坐标，绘制折线图，代码和结果如下：

import matplotlib.pyplot as plt
import matplotlib.animation as animation
from matplotlib import style


    
style.use(\'dark_background\')

fig = plt.figure()



graph_data = open(\'example.txt\',\'r\').read()
lines = graph_data.split(\'\\n\')
xs = []
ys = []
for line in lines:
    if len(line) > 1:
        x, y = line.split(\',\')
        xs.append(x)
        ys.append(y)

plt.plot(xs, ys)
plt.show()

 

解决：

我想这种bug也只有计算机专业能想到吧。。。

那就是——类型错误！从文件中读到的每个x和y为字符串，应该转换成int类型。改正后：

import matplotlib.pyplot as plt
import matplotlib.animation as animation
from matplotlib import style


    
style.use(\'dark_background\')

fig = plt.figure()



graph_data = open(\'example.txt\',\'r\').read()
lines = graph_data.split(\'\\n\')
xs = []
ys = []
for line in lines:
    if len(line) > 1:
        x, y = line.split(\',\')
        xs.append(int(x)) #注意读取到的是字符串类型
        ys.append(int(y)) 

plt.plot(xs, ys)
plt.show()