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在本教程中，我们将学习 Matplotlib 中的坐标轴标题。

Matplotlib 坐标轴标题

matplotlib.pyplot.title(label, fontdict=None, loc=None, **kwargs)

它用来设置当前轴的标题。

参数

# -*- coding: utf-8 -*-
import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(0, 4 * np.pi, 1000)
y = np.sin(x)

plt.figure(figsize=(4, 3))

plt.plot(x, y, "r")
plt.xlabel(
    "Time (s)",
    size=16,
)
plt.ylabel("Value", size=16)

plt.title(
    "Title Example",
    fontdict={"family": "serif", "color": "darkblue", "weight": "bold", "size": 18},
)

plt.grid(True)

plt.show()

plt.title(
    "Title Example",
    fontdict={"family": "serif", "color": "darkblue", "weight": "bold", "size": 18},
)

坐标轴上的多个标题

一个轴最多可以包含三个标题 left，center 和 right。特定标题的位置由 loc 参数指定。

# -*- coding: utf-8 -*-
import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(0, 4 * np.pi, 1000)
y = np.sin(x)

plt.figure(figsize=(8, 6))

plt.plot(x, y, "r")
plt.xlabel(
    "Time (s)",
    size=16,
)
plt.ylabel("Value", size=16)

plt.title(
    "Left title",
    fontdict={"family": "serif", "color": "darkblue", "weight": "bold", "size": 16},
    loc="left",
)

plt.title(
    "Center title",
    fontdict={"family": "monospace", "color": "red", "weight": "bold", "size": 16},
    loc="center",
)

plt.title(
    "Right title",
    fontdict={"family": "fantasy", "color": "black", "weight": "bold", "size": 16},
    loc="right",
)

plt.grid(True)

plt.show()

将坐标轴标题放置在绘图内部

你还可以使用 positon=(m, n) 或等效选项 x = m, y = n 将标题放置在绘图内。在这里，m 和 n 是介于 0.0 和 1.0 之间的数字。

位置 (0, 0) 是图的左下角，位置 (1.0, 1.0) 是右上角。

# -*- coding: utf-8 -*-
import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(0, 4 * np.pi, 1000)
y = np.sin(x)

plt.figure(figsize=(6, 4.5))

plt.plot(x, y, "r")
plt.xlabel("Time (s)", size=16)
plt.ylabel("Value", size=16)

plt.title(
    "Title Example",
    position=(0.5, 0.9),
    fontdict={"family": "serif", "color": "darkblue", "weight": "bold", "size": 16},
)

plt.show()