distr (version 1.7)

RtoDPQ.d: Default procedure to fill slots d,p,q given r for discrete distributions

Description

function to do get empirical density, cumulative distribution and quantile function from random numbers

Usage

RtoDPQ.d(r, e = getdistrOption("RtoDPQ.e"))

Arguments

r

the random number generator

e

$10^e$ numbers are generated, a higher number leads to a better result.

Value

• RtoDPQ returns a list of functions.
• dfun
  density
• pfun
  cumulative distribution function
• qfun
  quantile function

Details

RtoDPQ.d generates $10^e$ random numbers, by default $e =$ RtoDPQ.e which are used to produce a density, cdf and quantile function. Of course, the results are usually not exact as they rely on random numbers.

See Also

UnivariateDistribution-class, density, approxfun, ecdf

Examples

rn2 <- function(n){rnorm(n)^2}
x <- RtoDPQ(r = rn2, e = 4, n = 512)
# returns density, cumulative distribution and quantile function of
# squared standard  normal distribution

x$dfun(4)
RtoDPQ(r = rn2, e = 5, n = 1024) # for a better result

rp2 <- function(n){rpois(n, lambda = 1)^2}
x <- RtoDPQ.d(r = rp2, e = 5)
# returns density, cumulative distribution and quantile function of
# squared Poisson distribution with parameter lambda=1