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 numpy as np >>> import scipy.special as sc - It is more accurate than computing - cos(x) - 1directly for- xaround 0.- >>> x = 1e-30 >>> np.cos(x) - 1 0.0 >>> sc.cosm1(x) -5.0000000000000005e-61