copy¶

copy(a, out=None)¶

Return an array copy of the given object.

Parameters:	a : ndarray Input data. out : ndarray or None, optional Alternative output array in which to place the result. It must have the same shape and dtype as the expected output.
Returns:	arr : ndarray Array interpretation of a.

Notes

This function differs from the original numpy.copy in the following aspects:

Input type does not support Python native iterables(list, tuple, …).
out param: cannot perform auto broadcasting. out ndarray’s shape must be the same as the expected output.
out param: cannot perform auto type cast. out ndarray’s dtype must be the same as the expected output.
Does not support “order” parameter.

Examples

Create an array x, with a reference y and a copy z:

>>> x = np.array([1, 2, 3])
>>> y = x
>>> z = np.copy(x)

Note that, when x is modified, y is also modified, but not z:

>>> x[0] = 10
>>> x[0] == y[0]
array([1.])
>>> x[0] == z[0]
array([0.])