zeta(k, x)
k
| an integer scalar. |
x
|
a vector. Missing values (NaN s) are allowed, but Inf s are not.
|
log(2 P(x))
and its derivatives up to order 4,
if P(x) denotes the standard normal distribution function.k
denotes the order of the derivative. If k
is 0, the function
is evaluated, using normcdf(x)
for x>-35
, an asymptotic expansion
otherwise. For k
between 1 and 4, the derivative of that order is
evaluated. For k>4
, a warning message is issued, and a vector of
NaN
s is returned.
This function is used by sn_dev
and msn_dev
, among others.
k
-th order derivative evaluated at x
sn_mle
, msn_mle
y = zeta(2,[-20:0.5:20])