sign(x, /, out=None, *, where=True, casting='same_kind', order='K', dtype=None, subok=True[, signature, extobj])

Some inconsistencies with the Dask version may exist.

Returns an element-wise indication of the sign of a number.

The sign function returns -1 if x < 0, 0 if x==0, 1 if x > 0 . nan is returned for nan inputs.

For complex inputs, the sign function returns sign(x.real) + 0j if x.real != 0 else sign(x.imag) + 0j .

complex(nan, 0) is returned for complex nan inputs.

Notes

There is more than one definition of sign in common use for complex numbers. The definition used here is equivalent to $x/\sqrt{x*x}$ which is different from a common alternative, $x/|x|$ .

Parameters

x : array_like

Input values.

out : ndarray, None, or tuple of ndarray and None, optional

A location into which the result is stored. If provided, it must have a shape that the inputs broadcast to. If not provided or None, a freshly-allocated array is returned. A tuple (possible only as a keyword argument) must have length equal to the number of outputs.

where : array_like, optional

This condition is broadcast over the input. At locations where the condition is True, the :None:None:`out` array will be set to the ufunc result. Elsewhere, the :None:None:`out` array will retain its original value. Note that if an uninitialized :None:None:`out` array is created via the default out=None , locations within it where the condition is False will remain uninitialized.

**kwargs :

For other keyword-only arguments, see the ufunc docs <ufuncs.kwargs> .

Returns

y : ndarray

The sign of x. This is a scalar if x is a scalar.

This docstring was copied from numpy.sign.

Examples

This example is valid syntax, but we were not able to check execution

>>> np.sign([-5., 4.5])  # doctest: +SKIP
array([-1.,  1.])

This example is valid syntax, but we were not able to check execution

>>> np.sign(0)  # doctest: +SKIP
0

This example is valid syntax, but we were not able to check execution

>>> np.sign(5-2j)  # doctest: +SKIP
(1+0j)

See :

Back References

The following pages refer to to this document either explicitly or contain code examples using this.

dask.array.ufunc.sign

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