logPdf
Returns the natural logarithm of the probability density at x.
The log-density is useful when working with very small density values that would underflow to zero in regular floating-point arithmetic. Every implementation provides a direct formula rather than computing ln(pdf(x)), which avoids unnecessary precision loss.
Return
the natural log of the probability density at x. Returns Double.NEGATIVE_INFINITY when the density is zero.
Parameters
x
the point at which to evaluate the log-density.