努比。Python中的insert（）-yiteyi-C++库

这个 努比。插入（） 函数在给定索引之前沿所述轴插入值。 语法：

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numpy.insert(array, object, values, axis = None)

参数：

array   : [array_like]Input array. 
object  : [int, array of ints]Sub-array with the index or indices before 
     which values is inserted
values  : [array_like]values to be added in the arr. Values should be 
     shaped so that arr[...,obj,...] = values. If the type of values is different from 
     that of arr, values is converted to the type of arr
axis    : Axis along which we want to insert the values. By default, it 
     object is applied to flattened array

返回：

An copy of array with values being inserted as per the mentioned object along a given axis.

代码1：从1D数组中删除

                       # Python Program illustrating                     
                       # numpy.insert()                     
                                
                       import                                  numpy as geek                     
                                
                       #Working on 1D                     
                       arr                                  =                                  geek.arange(                                  5                                  )                     
                       print                                  (                                  "1D arr : "                                  , arr)                     
                       print                                  (                                  "Shape : "                                  , arr.shape)                     
                                
                       # value = 9                     
                       # index = 1                     
                       # Insertion before first index                     
                       a                                  =                                  geek.insert(arr,                                  1                                  ,                                  9                                  )                     
                       print                                  (                                  "Array after insertion : "                                  , a)                     
                       print                                  (                                  "Shape : "                                  , a.shape)                     
                                
                                
                       # Working on 2D array                     
                       arr                                  =                                  geek.arange(                                  12                                  ).reshape(                                  3                                  ,                                  4                                  )                     
                       print                                  (                                  "2D arr : "                                  , arr)                     
                       print                                  (                                  "Shape : "                                  , arr.shape)                     
                                
                       a                                  =                                  geek.insert(arr,                                  1                                  ,                                  9                                  , axis                                  =                                  1                                  )                     
                       print                                  (                                  "Array after insertion : "                                  , a)                     
                       print                                  (                                  "Shape : "                                  , a.shape)                     

输出：

1D arr : 
 [0 1 2 3 4]
Shape :  (5,)

Array after insertion :  [0 9 1 2 3 4]
Shape :  (6,)


2D arr : 
 [[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]]
Shape :  (3, 4)

Array after insertion : 
 [[ 0  9  1  2  3]
 [ 4  9  5  6  7]
 [ 8  9  9 10 11]]
Shape :  (3, 5)

代码2：使用标量

                       # Python Program illustrating                     
                       # numpy.insert()                     
                                
                       import                                  numpy as geek                     
                                
                       # Working on 2D array                     
                       arr                                  =                                  geek.arange(                                  12                                  ).reshape(                                  3                                  ,                                  4                                  )                     
                       print                                  (                                  "2D arr : "                                  , arr)                     
                       print                                  (                                  "Shape : "                                  , arr.shape)                     
                                
                       # Working with Scalars                     
                       a                                  =                                  geek.insert(arr, [                                  1                                  ], [[                                  6                                  ],[                                  9                                  ],], axis                                  =                                  0                                  )                     
                       print                                  (                                  "Array after insertion : "                                  , a)                     
                       print                                  (                                  "Shape : "                                  , a.shape)                     
                                
                       # Working with Scalars                     
                       a                                  =                                  geek.insert(arr, [                                  1                                  ], [[                                  8                                  ],[                                  7                                  ],[                                  9                                  ]], axis                                  =                                  1                                  )                     
                       print                                  (                                  "Array after insertion : "                                  , a)                     
                       print                                  (                                  "Shape : "                                  , a.shape)                     

输出：

2D arr : 
 [[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]]
Shape :  (3, 4)

Array after insertion : 
 [[ 0  1  2  3]
 [ 6  6  6  6]
 [ 9  9  9  9]
 [ 4  5  6  7]
 [ 8  9 10 11]]
Shape :  (5, 4)

Array after insertion : 
 [[ 0  8  1  2  3]
 [ 4  7  5  6  7]
 [ 8  9  9 10 11]]
Shape :  (3, 5)

代码3：在不同点插入

                       # Python Program illustrating                     
                       # numpy.insert()                     
                                
                       import                                  numpy as geek                     
                                
                       #Working on 1D                     
                       arr                                  =                                  geek.arange(                                  6                                  ).reshape(                                  2                                  ,                                  3                                  )                     
                       print                                  (                                  "1D arr : "                                  , arr)                     
                       print                                  (                                  "Shape : "                                  , arr.shape)                     
                                
                       # value = 9                     
                       # index = 1                     
                       # Insertion before first index                     
                       a                                  =                                  geek.insert(arr, (                                  2                                  ,                                  4                                  ),                                  9                                  )                     
                       print                                  (                                  "Insertion at two points : "                                  , a)                     
                       print                                  (                                  "Shape : "                                  , a.shape)                     
                                
                                
                       # Working on 2D array                     
                       arr                                  =                                  geek.arange(                                  12                                  ).reshape(                                  3                                  ,                                  4                                  )                     
                       print                                  (                                  "2D arr : "                                  , arr)                     
                       print                                  (                                  "Shape : "                                  , arr.shape)                     
                       a                                  =                                  geek.insert(arr, (                                  0                                  ,                                  3                                  ),                                  66                                  , axis                                  =                                  1                                  )                     
                       print                                  (                                  "Insertion at two points : "                                  , a)                     
                       print                                  (                                  "Shape : "                                  , a.shape)                     

输出：

1D arr : 
 [[0 1 2]
 [3 4 5]]
Shape :  (2, 3)

Insertion at two points :  [0 1 9 2 3 9 4 5]
Shape :  (8,)


2D arr : 
 [[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]]
Shape :  (3, 4)

Insertion at two points : 
 [[66  0  1  2 66  3]
 [66  4  5  6 66  7]
 [66  8  9 10 66 11]]
Shape :  (3, 6)

参考资料： https://docs.scipy.org/doc/numpy/reference/generated/numpy.insert.html#numpy.insert

注：这些代码不会在online-ID上运行。请在您的系统上运行它们以探索工作环境。

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