NumPy Functional programming: frompyfunc() function

Last update on August 19 2022 21:50:38 (UTC/GMT +8 hours)

numpy.frompyfunc() function

The frompyfunc() function is used to take an arbitrary Python function and returns a NumPy ufunc.

Can be used to add broadcasting to a built-in Python function.

Syntax:

numpy.frompyfunc(func, nin, nout)

Version: 1.15.0

Parameter:

Name	Description	Required / Optional
func	An arbitrary Python function. Python function object	Required
nin	The number of input arguments. int	Required
nout	The number of objects returned by func. int	Required

Returns: out : ufunc

Returns a NumPy universal function (ufunc) object.

Notes:

The returned ufunc always returns PyObject arrays.

NumPy.frompyfunc() method Example-1:

Use frompyfunc to add broadcasting to the Python function oct:

>>> import numpy as np
>>> array = np.frompyfunc(oct, 1, 1)
>>> array(np.array((25, 50, 75)))

Output:

array(['0o31', '0o62', '0o113'], dtype=object)

NumPy.frompyfunc() method Example-2:

Use frompyfunc to add broadcasting to the Python function oct:

>>> import numpy as np
>>> array = np.frompyfunc(oct, 1, 1)
>>> np.array((oct(25), oct(50), oct(75))) # for comparison

Output:

array(['0o31', '0o62', '0o113'], dtype='<U5')

Python - NumPy Code Editor:

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