Python-NumPy模块-数组的运算

ゝ一世哀愁。 2021-09-09 04:04 446阅读 0赞

## 四则运算 ##

import numpy
    a=numpy.array([[1,2,3,4],[5,6,7,8]])
    b=numpy.array([[9,10,11,12],[13,14,15,16]])
    c=a+b
    d=a-b
    e=a*b
    f=a/b
    print(c)
    print(d)
    print(e)
    print(f)

结果：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjQwMzYzMg_size_16_color_FFFFFF_t_70]

## 统计运算 ##

### 求和 ###

import numpy
    a=numpy.array([[1,2,3,4],[5,6,7,8],[9,10,11,12]])
    a1=a.sum()
    a2=a.sum(axis=0)
    a3=a.sum(axis=1)
    print(a1)
    print(a2)
    print(a3)

结果：  
![在这里插入图片描述][a0fee61456a7471c9a6c09a4d778b0a1.png]

### 求平均值 ###

import numpy
    a=numpy.array([[1,2,3,4],[5,6,7,8],[9,10,11,12]])
    a1=a.mean()
    a2=a.mean(axis=0)
    a3=a.mean(axis=1)
    print(a1)
    print(a2)
    print(a3)

结果：  
![在这里插入图片描述][6baf6a6fc3794e128f7410ad5906e827.png]

### 求最值 ###

import numpy
    a=numpy.array([[1,2,3,4],[5,6,7,8],[9,10,11,12]])
    a1=a.max()
    a2=a.max(axis=0)
    a3=a.max(axis=1)
    b1=a.min()
    b2=a.min(axis=0)
    b3=a.min(axis=1)
    print(a1)
    print(a2)
    print(a3)
    print(b1)
    print(b2)
    print(b3)

结果：  
![在这里插入图片描述][aa8bb1c0cdc044ff96dadf3dacd38adb.png]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjQwMzYzMg_size_16_color_FFFFFF_t_70]: /images/20210813/0e115305dba3472980b117319d7d58f1.png
[a0fee61456a7471c9a6c09a4d778b0a1.png]: /images/20210813/5113f377fbac45c3b6fa69a1fe6b4181.png
[6baf6a6fc3794e128f7410ad5906e827.png]: /images/20210813/a7332f98742348e3a73f86b9482e8905.png
[aa8bb1c0cdc044ff96dadf3dacd38adb.png]: /images/20210813/c6850e230bb4432499d741346fcee1fc.png