Element-wise Base Masked Array Raised to Power in NumPy

To return element-wise base array raised to power from second array, use the MaskedArray.power() method in Python Numpy.

The where parameter is a condition broadcast over the input. At locations where the condition is True, the out array will be set to the ufunc result. Elsewhere, the out array will retain its original value. Note that if an uninitialized out array is created via the default out=None, locations within it where the condition is False will remain uninitialized.

The out parameter is a location into which the result is stored. If provided, it must have a shape that the inputs broadcast to. If not provided or None, a freshly-allocated array is returned. A tuple (possible only as a keyword argument) must have length equal to the number of outputs.

Steps

At first, import the required library −

import numpy as np
import numpy.ma as ma

Create an array with int elements using the numpy.array() method −

arr = np.array([93, 33, 76, 73, 88, 51, 62, 45, 67])
print("Array...
", arr)

Create a masked array and mask some of them as invalid −

maskArr = ma.masked_array(arr, mask =[ 0, 0, 0, 0, 1, 0, 0, 1, 1])
print("
Our Masked Array...
", maskArr)

Get the type of the masked array −

print("
Our Masked Array type...
", maskArr.dtype)

Get the dimensions of the Masked Array −

print("
Our Masked Array Dimensions...
",maskArr.ndim)

Get the shape of the Masked Array −

print("
Our Masked Array Shape...
",maskArr.shape)

Get the number of elements of the Masked Array −

print("
Number of elements in the Masked Array...
",maskArr.size)

Set the power array −

arrPower = [2, 3, 4, 2, 4, 3, 5, 3, 2]

To return element-wise base array raised to power from second array, use the MaskedArray.power() method −

resArr = np.ma.power(maskArr, arrPower)
print("
Resultant Array..
.", resArr)

Example

import numpy as np
import numpy.ma as ma

# Create an array with int elements using the numpy.array() method
arr = np.array([93, 33, 76, 73, 88, 51, 62, 45, 67])
print("Array...
", arr)

# Create a masked array and mask some of them as invalid
maskArr = ma.masked_array(arr, mask =[ 0, 0, 0, 0, 1, 0, 0, 1, 1])
print("
Our Masked Array...
", maskArr)

# Get the type of the masked array
print("
Our Masked Array type...
", maskArr.dtype)

# Get the dimensions of the Masked Array
print("
Our Masked Array Dimensions...
",maskArr.ndim)

# Get the shape of the Masked Array
print("
Our Masked Array Shape...
",maskArr.shape)

# Get the number of elements of the Masked Array
print("
Number of elements in the Masked Array...
",maskArr.size)

# Set the power array
arrPower = [2, 3, 4, 2, 4, 3, 5, 3, 2]

# To return element-wise base array raised to power from second array, use the MaskedArray.power() method in Python Numpy
resArr = np.ma.power(maskArr, arrPower)
print("
Resultant Array..
.", resArr)

Output

Array...
[93 33 76 73 88 51 62 45 67]

Our Masked Array...
[93 33 76 73 -- 51 62 -- --]

Our Masked Array type...
int64

Our Masked Array Dimensions...
1

Our Masked Array Shape...
(9,)

Number of elements in the Masked Array...
9

Resultant Array..
. [8649 35937 33362176 5329 -- 132651 916132832 -- --]