在NumPy中返回一个填充零的给定形状的新数组
要返回一个具有给定形状和类型的、填充零的新数组,请使用Python NumPy中的**ma.zeros()**方法。第一个参数设置数组的形状。
dtype参数是数组所需的数据类型。order参数建议是否以行优先(C风格)或列优先(Fortran风格)的顺序在内存中存储多维数据。
掩码数组是标准numpy.ndarray和掩码的组合。掩码或者是nomask,表示关联数组的无值无效,或者是一个布尔数组,它确定关联数组的每个元素的值是否有效。
步骤
首先,导入所需的库:
import numpy as np import numpy.ma as ma
返回一个具有给定形状和类型的、填充零的新数组,使用ma.zeros()方法:
arr = ma.zeros((5,5))
显示我们的数组:
print("Array...
",arr)
获取数据类型:
print("
Array datatype...
",arr.dtype)
获取数组的维度:
print("
Array Dimensions...
",arr.ndim)
获取数组的形状:
print("
Our Array Shape...
",arr.shape)
获取数组的元素数量:
print("
Elements in the Array...
",arr.size)
示例
# Python ma.MaskedArray - Return a new array of given shape filled with zeros import numpy as np import numpy.ma as ma # To return a new array of given shape and type, filled with zeros, use the ma.zeros() method in Python Numpy # The 1st parameter sets the shape of the array arr = ma.zeros((5,5)) # Displaying our array print("Array...
",arr) # Get the datatype print("
Array datatype...
",arr.dtype) # Get the dimensions of the Array print("
Array Dimensions...
",arr.ndim) # Get the shape of the Array print("
Our Array Shape...
",arr.shape) # Get the number of elements of the Array print("
Elements in the Array...
",arr.size)
输出
Array... [[0. 0. 0. 0. 0.] [0. 0. 0. 0. 0.] [0. 0. 0. 0. 0.] [0. 0. 0. 0. 0.] [0. 0. 0. 0. 0.]] Array datatype... float64 Array Dimensions... 2 Our Array Shape... (5, 5) Elements in the Array... 25
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