Log of the survival function of the given RV.
Returns the log of the “survival function,” defined as (1 - cdf), evaluated at x.
| Parameters : | x : array_like 
 arg1, arg2, arg3,... : array_like 
 loc : array_like, optional 
 scale : array_like, optional 
 | 
|---|---|
| Returns : | logsf : ndarray 
 |