努比。Python中的repeat（）-yiteyi-C++库

这个 努比。重复（） 函数重复数组的元素–arr。 语法：

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numpy.repeat(arr, repetitions, axis = None)

参数：

array       : [array_like]Input array. 
repetitions : No. of repetitions of each array elements along the given axis.
axis        : Axis along which we want to repeat values. By default, it returns 
           a flat output array.

返回：

An array with repetitions of array - arr elements as per repetitions, number of times 
we want to repeat arr

代码1：

                       # Python Program illustrating                     
                       # numpy.repeat()                     
                                
                       import                                  numpy as geek                     
                                
                       #Working on 1D                     
                       arr                                  =                                  geek.arange(                                  5                                  )                     
                       print                                  (                                  "arr : "                                  , arr)                     
                                
                       repetitions                                  =                                  2                     
                       a                                  =                                  geek.repeat(arr, repetitions)                     
                       print                                  (                                  "Repeating arr 2 times : "                                  , a)                     
                       print                                  (                                  "Shape : "                                  , a.shape)                     
                                
                       repetitions                                  =                                  3                     
                       a                                  =                                  geek.repeat(arr, repetitions)                     
                       print                                  (                                  "Repeating arr 3 times : "                                  , a)                     
                       # [0 0 0 ..., 4 4 4] means [0 0 0 1 1 1 2 2 2 3 3 3 4 4 4]                     
                       # since it was long output, so it uses [ ... ]                     
                       print                                  (                                  "Shape : "                                  , a.shape)                     

输出：

arr : 
 [0 1 2 3 4]

Repeating arr 2 times : 
 [0 0 1 1 2 2 3 3 4 4]
Shape :  (10,)

Repeating arr 3 times : 
 [0 0 0 ..., 4 4 4]
Shape :  (15,)

代码2：

                       # Python Program illustrating                     
                       # numpy.repeat()                     
                                
                       import                                  numpy as geek                     
                                
                       arr                                  =                                  geek.arange(                                  6                                  ).reshape(                                  2                                  ,                                  3                                  )                     
                       print                                  (                                  "arr : "                                  , arr)                     
                                
                       repetitions                                  =                                  2                     
                       print                                  (                                  "Repeating arr : "                                  , geek.repeat(arr, repetitions,                                  1                                  ))                     
                       print                                  (                                  "arr Shape : "                                  , geek.repeat(arr, repetitions).shape)                     
                                
                                
                       repetitions                                  =                                  2                     
                       print                                  (                                  "Repeating arr : "                                  , geek.repeat(arr, repetitions,                                  0                                  ))                     
                       print                                  (                                  "arr Shape : "                                  , geek.repeat(arr, repetitions).shape)                     
                                
                       repetitions                                  =                                  3                     
                       print                                  (                                  "Repeating arr : "                                  , geek.repeat(arr, repetitions,                                  1                                  ))                     
                       print                                  (                                  "arr Shape : "                                  , geek.repeat(arr, repetitions).shape)                     

输出：

arr : 
 [[0 1 2]
 [3 4 5]]

Repeating arr : 
 [[0 0 1 1 2 2]
 [3 3 4 4 5 5]]
arr Shape : 
 (12,)

Repeating arr : 
 [[0 1 2]
 [0 1 2]
 [3 4 5]
 [3 4 5]]
arr Shape : 
 (12,)

Repeating arr : 
 [[0 0 0 ..., 2 2 2]
 [3 3 3 ..., 5 5 5]]
arr Shape : 
 (18,)

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

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