pub fn update(prior: &Family, seen: Seen) -> Option<(f64, Family)>Expand description
Observing seen, with the variable distributed as prior: the natural
logarithm of the observation’s probability (a density for Normal), and
the variable’s distribution after it. None if the two aren’t a
conjugate pair. A logarithm of −∞ means the observation is impossible,
like a count above the number of trials; the prior is returned then.