numpy.asarray_chkfinite() in Python

numpy.asarray_chkfinite() in Python

The numpy.asarray_chkfinite() function converts the input to an array, checking for NaNs or Infs.

Syntax

numpy.asarray_chkfinite(a, dtype=None, order=None)

Parameter

a : This parameter represents an input data, which can be in the form of lists, tuples, lists of tuples, tuples of tuples and ndarrays,etc,.that can be converted to an array.

dtype : It is an optional parameter, and by default, the data-type is inferred from the input data.

order : This parameter decides whether to use row-major (C-style) or column-major (Fortran-style) memory representation and by default, the ‘C-style’ is selected.

Return

This function returns an array interpretation of parameter ‘a’. If ‘a’ is a subclass of ndarray, a base class ndarray is returned.

Raises

This function raises a ValueError if the parameter ‘a’ contains NaN (Not a Number) or Inf (Infinity).

Example 1

# Python program explaining
# numpy.asarray_chkfinite() function 
import numpy as np
inp_list = [19, 13, 25, 37]
print ("Input List: ", inp_list)
out_arr = np.asarray_chkfinite(inp_list) 
print ("Output array: ", out_arr)

Output

Input List:  [19, 13, 25, 37]
Output array:  [19 13 25 37]

Example 2

# Python program explaining
# numpy.asarray_chkfinite() function
import numpy as np
inp_scalar = 500
print ("Input  scalar: ", inp_scalar)
out_arr = np.asarray_chkfinite(inp_scalar, dtype ='float')
print ("Output array: ", out_arr)

Output

Input  scalar:  500
Output array:  500.0

Example 3 : When value error occurs

# Python program explaining
# numpy.asarray_chkfinite() function 
import numpy as np
#passing NAN value
inp_list = [19, 13, 25, 37, np.inf, np.nan]
print ("Input List: ", inp_list)
out_arr = np.asarray_chkfinite(inp_list) 
print ("Output array: ", out_arr)

Output

Input List:  [19, 13, 25, 37, inf, nan]
Traceback (most recent call last):
File "main.py", line 10, in <module>
out_arr = np.asarray_chkfinite(inp_list) 
File "/usr/lib/python3/dist-packages/numpy/lib/function_base.py", line 595, in asarray_chkfinite
"array must not contain infs or NaNs")
ValueError: array must not contain infs or NaNs