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# Pyplot 教程
## Matplotlib 简介
**`matplotlib`** 是一个 **`Python`** 的 `2D` 图形包。
在线文档:[http://matplotlib.org](http://matplotlib.org) ,提供了 [Examples](http://matplotlib.org/examples/index.html), [FAQ](http://matplotlib.org/faq/index.html), [API](http://matplotlib.org/contents.html), [Gallery](http://matplotlib.org/gallery.html),其中 [Gallery](http://matplotlib.org/gallery.html) 是很有用的一个部分,因为它提供了各种画图方式的可视化,方便用户根据需求进行选择。
## 使用 Pyplot
导入相关的包:
In [1]:
```py
import numpy as np
import matplotlib.pyplot as plt
```
`matplotlib.pyplot` 包含一系列类似 **`MATLAB`** 中绘图函数的相关函数。每个 `matplotlib.pyplot` 中的函数对当前的图像进行一些修改,例如:产生新的图像,在图像中产生新的绘图区域,在绘图区域中画线,给绘图加上标记,等等…… `matplotlib.pyplot` 会自动记住当前的图像和绘图区域,因此这些函数会直接作用在当前的图像上。
下文中,以 `plt` 作为 `matplotlib.pyplot` 的省略。
## plt.show() 函数
默认情况下,`matplotlib.pyplot` 不会直接显示图像,只有调用 `plt.show()` 函数时,图像才会显示出来。
`plt.show()` 默认是在新窗口打开一幅图像,并且提供了对图像进行操作的按钮。
不过在 `ipython` 命令行中,我们可以使用 `magic` 命令将它插入 `notebook` 中,并且不需要调用 `plt.show()` 也可以显示:
* `%matplotlib notebook`
* `%matplotlib inline`
不过在实际写程序中,我们还是需要调用 `plt.show()` 函数将图像显示出来。
这里我们使图像输出在 `notebook` 中:
In [2]:
```py
%matplotlib inline
```
## plt.plot() 函数
### 例子
`plt.plot()` 函数可以用来绘图:
In [3]:
```py
plt.plot([1,2,3,4])
plt.ylabel('some numbers')
plt.show()
```
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)
### 基本用法
`plot` 函数基本的用法有以下四种:
默认参数
* `plt.plot(x,y)`
指定参数
* `plt.plot(x,y, format_str)`
默认参数,`x``0~N-1`
* `plt.plot(y)`
指定参数,`x``0~N-1`
* `plt.plot(y, format_str)`
因此,在上面的例子中,我们没有给定 `x` 的值,所以其默认值为 `[0,1,2,3]`
传入 `x``y`
In [4]:
```py
plt.plot([1,2,3,4], [1,4,9,16])
```
Out[4]:
```py
[<matplotlib.lines.Line2D at 0xa48a550>]
```
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### 字符参数
**`MATLAB`** 中类似,我们还可以用字符来指定绘图的格式:
表示颜色的字符参数有:
| 字符 | 颜色 |
| --- | --- |
| `b` | 蓝色blue |
| `g` | 绿色green |
| `r` | 红色red |
| `c` | 青色cyan |
| `m` | 品红magenta |
| `y` | 黄色yellow |
| `k` | 黑色black |
| `w` | 白色white |
表示类型的字符参数有:
| 字符 | 类型 | 字符 | 类型 |
| --- | --- | --- | --- |
| `'-'` | 实线 | `'--'` | 虚线 |
| `'-.'` | 虚点线 | `':'` | 点线 |
| `'.'` | 点 | `','` | 像素点 |
| `'o'` | 圆点 | `'v'` | 下三角点 |
| `'^'` | 上三角点 | `'<'` | 左三角点 |
| `'>'` | 右三角点 | `'1'` | 下三叉点 |
| `'2'` | 上三叉点 | `'3'` | 左三叉点 |
| `'4'` | 右三叉点 | `'s'` | 正方点 |
| `'p'` | 五角点 | `'*'` | 星形点 |
| `'h'` | 六边形点1 | `'H'` | 六边形点2 |
| `'+'` | 加号点 | `'x'` | 乘号点 |
| `'D'` | 实心菱形点 | `'d'` | 瘦菱形点 |
| `'_'` | 横线点 | | |
例如我们要画出红色圆点:
In [5]:
```py
plt.plot([1,2,3,4], [1,4,9,16], 'ro')
plt.show()
```
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)
可以看出,有两个点在图像的边缘,因此,我们需要改变轴的显示范围。
### 显示范围
**`MATLAB`** 类似,这里可以使用 `axis` 函数指定坐标轴显示的范围:
```py
plt.axis([xmin, xmax, ymin, ymax])
```
In [6]:
```py
plt.plot([1,2,3,4], [1,4,9,16], 'ro')
# 指定 x 轴显示区域为 0-6y 轴为 0-20
plt.axis([0,6,0,20])
plt.show()
```
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)
### 传入 `Numpy` 数组
之前我们传给 `plot` 的参数都是列表,事实上,向 `plot` 中传入 `numpy` 数组是更常用的做法。事实上,如果传入的是列表,`matplotlib` 会在内部将它转化成数组再进行处理:
In [7]:
```py
import numpy as np
import matplotlib.pyplot as plt
# evenly sampled time at 200ms intervals
t = np.arange(0., 5., 0.2)
# red dashes, blue squares and green triangles
plt.plot(t, t, 'r--',
t, t**2, 'bs',
t, t**3, 'g^')
plt.show()
```
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)
### 传入多组数据
事实上,在上面的例子中,我们不仅仅向 `plot` 函数传入了数组,还传入了多组 `(x,y,format_str)` 参数,它们在同一张图上显示。
这意味着我们不需要使用多个 `plot` 函数来画多组数组,只需要可以将这些组合放到一个 `plot` 函数中去即可。
### 线条属性
之前提到,我们可以用字符串来控制线条的属性,事实上还可以通过关键词来改变线条的性质,例如 `linwidth` 可以改变线条的宽度,`color` 可以改变线条的颜色:
In [8]:
```py
x = np.linspace(-np.pi,np.pi)
y = np.sin(x)
plt.plot(x, y, linewidth=2.0, color='r')
plt.show()
```
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### 使用 plt.plot() 的返回值来设置线条属性
`plot` 函数返回一个 `Line2D` 对象组成的列表,每个对象代表输入的一对组合,例如:
* line1, line2 为两个 Line2D 对象
`line1, line2 = plt.plot(x1, y1, x2, y2)`
* 返回 3 个 Line2D 对象组成的列表
`lines = plt.plot(x1, y1, x2, y2, x3, y3)`
我们可以使用这个返回值来对线条属性进行设置:
In [9]:
```py
# 加逗号 line 中得到的是 line2D 对象,不加逗号得到的是只有一个 line2D 对象的列表
line, = plt.plot(x, y, 'r-')
# 将抗锯齿关闭
line.set_antialiased(False)
plt.show()
```
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### plt.setp() 修改线条性质
更方便的做法是使用 `plt``setp` 函数:
In [10]:
```py
lines = plt.plot(x, y)
# 使用键值对
plt.setp(lines, color='r', linewidth=2.0)
# 或者使用 MATLAB 风格的字符串对
plt.setp(lines, 'color', 'r', 'linewidth', 2.0)
plt.show()
```
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可以设置的属性有很多,可以使用 `plt.setp(lines)` 查看 `lines` 可以设置的属性,各属性的含义可参考 `matplotlib` 的文档。
In [11]:
```py
plt.setp(lines)
```
```py
agg_filter: unknown
alpha: float (0.0 transparent through 1.0 opaque)
animated: [True | False]
antialiased or aa: [True | False]
axes: an :class:`~matplotlib.axes.Axes` instance
clip_box: a :class:`matplotlib.transforms.Bbox` instance
clip_on: [True | False]
clip_path: [ (:class:`~matplotlib.path.Path`, :class:`~matplotlib.transforms.Transform`) | :class:`~matplotlib.patches.Patch` | None ]
color or c: any matplotlib color
contains: a callable function
dash_capstyle: ['butt' | 'round' | 'projecting']
dash_joinstyle: ['miter' | 'round' | 'bevel']
dashes: sequence of on/off ink in points
drawstyle: ['default' | 'steps' | 'steps-pre' | 'steps-mid' | 'steps-post']
figure: a :class:`matplotlib.figure.Figure` instance
fillstyle: ['full' | 'left' | 'right' | 'bottom' | 'top' | 'none']
gid: an id string
label: string or anything printable with '%s' conversion.
linestyle or ls: [``'-'`` | ``'--'`` | ``'-.'`` | ``':'`` | ``'None'`` | ``' '`` | ``''``]
linewidth or lw: float value in points
lod: [True | False]
marker: :mod:`A valid marker style <matplotlib.markers>`
markeredgecolor or mec: any matplotlib color
markeredgewidth or mew: float value in points
markerfacecolor or mfc: any matplotlib color
markerfacecoloralt or mfcalt: any matplotlib color
markersize or ms: float
markevery: [None | int | length-2 tuple of int | slice | list/array of int | float | length-2 tuple of float]
path_effects: unknown
picker: float distance in points or callable pick function ``fn(artist, event)``
pickradius: float distance in points
rasterized: [True | False | None]
sketch_params: unknown
snap: unknown
solid_capstyle: ['butt' | 'round' | 'projecting']
solid_joinstyle: ['miter' | 'round' | 'bevel']
transform: a :class:`matplotlib.transforms.Transform` instance
url: a url string
visible: [True | False]
xdata: 1D array
ydata: 1D array
zorder: any number
```
## 子图
`figure()` 函数会产生一个指定编号为 `num` 的图:
```py
plt.figure(num)
```
这里,`figure(1)` 其实是可以省略的,因为默认情况下 `plt` 会自动产生一幅图像。
使用 `subplot` 可以在一副图中生成多个子图,其参数为:
```py
plt.subplot(numrows, numcols, fignum)
```
`numrows * numcols < 10` 时,中间的逗号可以省略,因此 `plt.subplot(211)` 就相当于 `plt.subplot(2,1,1)`
In [12]:
```py
def f(t):
return np.exp(-t) * np.cos(2*np.pi*t)
t1 = np.arange(0.0, 5.0, 0.1)
t2 = np.arange(0.0, 5.0, 0.02)
plt.figure(1)
plt.subplot(211)
plt.plot(t1, f(t1), 'bo', t2, f(t2), 'k')
plt.subplot(212)
plt.plot(t2, np.cos(2*np.pi*t2), 'r--')
plt.show()
```
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## 图形上加上文字
`plt.hist()` 可以用来画直方图。
In [13]:
```py
mu, sigma = 100, 15
x = mu + sigma * np.random.randn(10000)
# the histogram of the data
n, bins, patches = plt.hist(x, 50, normed=1, facecolor='g', alpha=0.75)
plt.xlabel('Smarts')
plt.ylabel('Probability')
plt.title('Histogram of IQ')
plt.text(60, .025, r'$\mu=100,\ \sigma=15$')
plt.axis([40, 160, 0, 0.03])
plt.grid(True)
plt.show()
```
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)
对于这幅图形,我们使用 `xlabel` `ylabel``title``text` 方法设置了文字,其中:
* `xlabel` x 轴标注
* `ylabel` y 轴标注
* `title` :图形标题
* `text` :在指定位置放入文字
输入特殊符号支持使用 `Tex` 语法,用 `$<some Tex code>$` 隔开。
除了使用 `text` 在指定位置标上文字之外,还可以使用 `annotate` 函数进行注释,`annotate` 主要有两个参数:
* `xy` :注释位置
* `xytext` :注释文字位置
In [14]:
```py
ax = plt.subplot(111)
t = np.arange(0.0, 5.0, 0.01)
s = np.cos(2*np.pi*t)
line, = plt.plot(t, s, lw=2)
plt.annotate('local max', xy=(2, 1), xytext=(3, 1.5),
arrowprops=dict(facecolor='black', shrink=0.05),
)
plt.ylim(-2,2)
plt.show()
```
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