scipy.special.cosm1#
- scipy.special.cosm1(x, out=None) = <ufunc 'cosm1'>#
cos(x) - 1 for use when x is near zero.
- Parameters
- xarray_like
Real valued argument.
- outndarray, optional
Optional output array for the function results.
- Returns
- scalar or ndarray
Values of
cos(x) - 1
.
Examples
>>> import scipy.special as sc
It is more accurate than computing
cos(x) - 1
directly forx
around 0.>>> x = 1e-30 >>> np.cos(x) - 1 0.0 >>> sc.cosm1(x) -5.0000000000000005e-61