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Module « numpy.matlib »

Fonction can_cast - module numpy.matlib

Signature de la fonction can_cast

Description

help(numpy.matlib.can_cast)

can_cast(from_, to, casting='safe')

Returns True if cast between data types can occur according to the
casting rule.

Parameters
----------
from_ : dtype, dtype specifier, NumPy scalar, or array
    Data type, NumPy scalar, or array to cast from.
to : dtype or dtype specifier
    Data type to cast to.
casting : {'no', 'equiv', 'safe', 'same_kind', 'unsafe'}, optional
    Controls what kind of data casting may occur.

    * 'no' means the data types should not be cast at all.
    * 'equiv' means only byte-order changes are allowed.
    * 'safe' means only casts which can preserve values are allowed.
    * 'same_kind' means only safe casts or casts within a kind,
      like float64 to float32, are allowed.
    * 'unsafe' means any data conversions may be done.

Returns
-------
out : bool
    True if cast can occur according to the casting rule.

Notes
-----
.. versionchanged:: 2.0
   This function does not support Python scalars anymore and does not
   apply any value-based logic for 0-D arrays and NumPy scalars.

See also
--------
dtype, result_type

Examples
--------
Basic examples

>>> import numpy as np
>>> np.can_cast(np.int32, np.int64)
True
>>> np.can_cast(np.float64, complex)
True
>>> np.can_cast(complex, float)
False

>>> np.can_cast('i8', 'f8')
True
>>> np.can_cast('i8', 'f4')
False
>>> np.can_cast('i4', 'S4')
False

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