The Lognormal Distribution
Random:
double
gsl_ran_lognormal
(const gsl_rng *
r
, double
zeta
, double
sigma
)
This function returns a random variate from the lognormal distribution. The distribution function is,
p(x) dx = {1 \over x \sqrt{2 \pi \sigma^2} } \exp(-(\ln(x) - \zeta)^2/2 \sigma^2) dx
for x > 0.
Function:
double
gsl_ran_lognormal_pdf
(double
x
, double
zeta
, double
sigma
)
This function computes the probability density p(x) at
x
for a lognormal distribution with parameters
zeta
and
sigma
, using the formula given above.