numpy.asarray_chkfinite

numpy.asarray_chkfinite(a, dtype=None, order=None)[源代码]

Convert the input to an array, checking for NaNs or Infs.

Parameters:
a : array_like

Input data, in any form that can be converted to an array. This includes lists, lists of tuples, tuples, tuples of tuples, tuples of lists and ndarrays. Success requires no NaNs or Infs.

dtype : data-type, optional

By default, the data-type is inferred from the input data.

order : {‘C’, ‘F’}, optional

Whether to use row-major (C-style) or column-major (Fortran-style) memory representation. Defaults to ‘C’.

Returns:
out : ndarray

Array interpretation of a. No copy is performed if the input is already an ndarray. If a is a subclass of ndarray, a base class ndarray is returned.

Raises:
ValueError

Raises ValueError if a contains NaN (Not a Number) or Inf (Infinity).

参见

asarray
Create and array.
asanyarray
Similar function which passes through subclasses.
ascontiguousarray
Convert input to a contiguous array.
asfarray
Convert input to a floating point ndarray.
asfortranarray
Convert input to an ndarray with column-major memory order.
fromiter
Create an array from an iterator.
fromfunction
Construct an array by executing a function on grid positions.

Examples

Convert a list into an array. If all elements are finite asarray_chkfinite is identical to asarray.

>>> a = [1, 2]
>>> np.asarray_chkfinite(a, dtype=float)
array([1., 2.])

Raises ValueError if array_like contains Nans or Infs.

>>> a = [1, 2, np.inf]
>>> try:
...     np.asarray_chkfinite(a)
... except ValueError:
...     print('ValueError')
...
ValueError