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numpy.power() in Python
• Last Updated : 29 Nov, 2018

numpy.power(arr1, arr2, out = None, where = True, casting = ‘same_kind’, order = ‘K’, dtype = None) :
Array element from first array is raised to the power of element from second element(all happens element-wise). Both arr1 and arr2 must have same shape and each element in arr1 must be raised to corresponding +ve value from arr2; otherwise it will raise a ValueError.
Parameters :

```arr1     : [array_like]Input array or object which works as base.
arr2     : [array_like]Input array or object which works as exponent.
out      : [ndarray, optional]Output array with same dimensions as Input array,
placed with result.
**kwargs : Allows you to pass keyword variable length of argument to a function.
It is used when we want to handle named argument in a function.
where    : [array_like, optional]True value means to calculate the universal
functions(ufunc) at that position, False value means to leave the
value in the output alone.
```

Return :

```An array with elements of arr1 raised to exponents in arr2
```

Code 1 : arr1 raised to arr2

 `# Python program explaining ` `# power() function ` `import` `numpy as np ` ` `  `# input_array ` `arr1 ``=` `[``2``, ``2``, ``2``, ``2``, ``2``] ` `arr2 ``=` `[``2``, ``3``, ``4``, ``5``, ``6``] ` `print` `(``"arr1         : "``, arr1) ` `print` `(``"arr1         : "``, arr2) ` ` `  `# output_array ` `out ``=` `np.power(arr1, arr2) ` `print` `(``"\nOutput array : "``, out) `

Output :

```arr1         :  [2, 2, 2, 2, 2]
arr2         :  [2, 3, 4, 5, 6]

Output array :  [ 4  8 16 32 64]
```

Code 2 : elements of arr1 raised to exponent 2

 `# Python program explaining ` `# power() function ` `import` `numpy as np ` ` `  `# input_array ` `arr1 ``=` `np.arange(``8``) ` `exponent ``=` `2` `print` `(``"arr1         : "``, arr1) ` ` `  `# output_array ` `out ``=` `np.power(arr1, exponent) ` `print` `(``"\nOutput array : "``, out) `

Output :

```arr1         :  [0 1 2 3 4 5 6 7]

Output array :  [ 0  1  4  9 16 25 36 49]```

Code 3 : Error if arr2 has -ve elements

 `# Python program explaining ` `# power() function ` `import` `numpy as np ` ` `  `# input_array ` `arr1 ``=` `[``2``, ``2``, ``2``, ``2``, ``2``] ` `arr2 ``=` `[``2``, ``-``3``, ``4``, ``-``5``, ``6``] ` `print` `(``"arr1         : "``, arr1) ` `print` `(``"arr2         : "``, arr2) ` ` `  `# output_array ` `out ``=` `np.power(arr1, arr2) ` `print` `(``"\nOutput array : "``, out) `

Output :

```arr1         :  [2, 2, 2, 2, 2]
arr2         :  [2, -3, 4, -5, 6]
ValueError: Integers to negative integer powers are not allowed.```

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