Python中的 numpy.ma.row_stack()

numpy.ma.row_stack() ：此函数有助于以垂直方式逐行堆叠数组。

参数 ：

tup : sequence of ndarrays. 1D arrays must have same length, arrays must have the same shape along with all the axis.

结果 ：

Row-wise stacked arrays

代码 #1：解释 row_stack()

# importing libraries
import numpy as np
  
# row_stacking array
a = np.array([1, 2, 3])
arr = np.ma.row_stack (a)
  
print ("arr : \n", arr)
  
# row_stacking array
b = np.array([[1], [2], [3]])
arr1 = np.ma.row_stack (b)
  
print ("\narr1 : \n", arr1)

输出 ：

arr : 
 [[1]
 [2]
 [3]]

arr1 : 
 [[1]
 [2]
 [3]]

代码 #2：使用 row_stack() 生成的错误

# importing libraries
import numpy as np
  
# row_stacking array
  
b = np.array([[1, 1], [2], [3]])
arr1 = np.ma.row_stack (b)
  
print ("\narr1 : \n", arr1)

输出 ：

ValueError: all the input array dimensions except for the concatenation axis must match exactly.