Probability distribution function, for example, pnorm for the normal distribution, which must be defined in the current workspace. This should accept and return vectorised parameters and values. It should also return the correct values for the entire real line, for example a positive distribution should have pdist(x)==0 for x<0.

Vector of probabilities to find the quantiles for.

Vector of character strings naming arguments of the distribution function that should not be vectorised over. Used, for example, for the rate and t arguments in qpexp.

The remaining arguments define parameters of the distribution pdist. These MUST be named explicitly.

This may also contain the standard arguments log.p (logical; default FALSE, if TRUE, probabilities p are given as log(p)), and lower.tail (logical; if TRUE (default), probabilities are P[X <= x] otherwise, P[X > x].).

If the distribution is bounded above or below, then this should contain arguments lbound and ubound respectively, and these will be returned if p is 0 or 1 respectively. Defaults to -Inf and Inf respectively.