numpy.empty_like — NumPy v1.18 Manual (original) (raw)
numpy. empty_like(prototype, dtype=None, order='K', subok=True, shape=None)¶
Return a new array with the same shape and type as a given array.
Parameters
prototypearray_like
The shape and data-type of prototype define these same attributes of the returned array.
dtypedata-type, optional
Overrides the data type of the result.
New in version 1.6.0.
order{‘C’, ‘F’, ‘A’, or ‘K’}, optional
Overrides the memory layout of the result. ‘C’ means C-order, ‘F’ means F-order, ‘A’ means ‘F’ if prototype is Fortran contiguous, ‘C’ otherwise. ‘K’ means match the layout of prototypeas closely as possible.
New in version 1.6.0.
subokbool, optional.
If True, then the newly created array will use the sub-class type of ‘a’, otherwise it will be a base-class array. Defaults to True.
shapeint or sequence of ints, optional.
Overrides the shape of the result. If order=’K’ and the number of dimensions is unchanged, will try to keep order, otherwise, order=’C’ is implied.
New in version 1.17.0.
Returns
outndarray
Array of uninitialized (arbitrary) data with the same shape and type as prototype.
See also
Return an array of ones with shape and type of input.
Return an array of zeros with shape and type of input.
Return a new array with shape of input filled with value.
Return a new uninitialized array.
Notes
This function does not initialize the returned array; to do that usezeros_like or ones_like instead. It may be marginally faster than the functions that do set the array values.
Examples
a = ([1,2,3], [4,5,6]) # a is array-like np.empty_like(a) array([[-1073741821, -1073741821, 3], # uninitialized [ 0, 0, -1073741821]]) a = np.array([[1., 2., 3.],[4.,5.,6.]]) np.empty_like(a) array([[ -2.00000715e+000, 1.48219694e-323, -2.00000572e+000], # uninitialized [ 4.38791518e-305, -2.00000715e+000, 4.17269252e-309]])