Return *x* with the sign of *y*. ``copysign`` copies the sign bit of an IEEE
754 float, ``copysign(1, -0.0)`` returns *-1.0*.
- ..versionadded:: 2.6
+ .. versionadded:: 2.6
.. function:: fabs(x)
Checks if the float *x* is positive or negative infinite.
- ..versionadded:: 2.6
+ .. versionadded:: 2.6
.. function:: isnan(x)
``inf / inf`` or any operation involving a NaN, e.g. ``nan * 1``, return
a NaN.
- ..versionadded:: 2.6
+ .. versionadded:: 2.6
.. function:: ldexp(x, i)