dpois_rvec: Poisson Distribution, Using Multiple Draws

In rvec: Vectors Representing Random Variables

Poisson Distribution, Using Multiple Draws

Description

Density, distribution function, quantile function and random generation for the Poisson distribution, modified to work with rvecs.

Usage

dpois_rvec(x, lambda, log = FALSE)

ppois_rvec(q, lambda, lower.tail = TRUE, log.p = FALSE)

qpois_rvec(p, lambda, lower.tail = TRUE, log.p = FALSE)

rpois_rvec(n, lambda, n_draw = NULL)

Arguments

x	Quantiles. Can be an rvec.
lambda	Vector of means. See rpois(). Can be an rvec.
log, log.p	Whether to return results on a log scale. Default is FALSE. Cannot be an rvec.
q	Quantiles. Can be an rvec.
lower.tail	Whether to return P[X \le x], as opposed to P[X > x]. Default is TRUE. Cannot be an rvec.
p	Probabilities. Can be an rvec.
n	The length of random vector being created. Cannot be an rvec.
n_draw	Number of random draws in the random vector being created. Cannot be an rvec.

Details

Functions dpois_rvec(), ppois_rvec(), ppois_rvec() and rpois_rvec() work like base R functions dpois(), ppois(), qpois(), and rpois(), except that they accept rvecs as inputs. If any input is an rvec, then the output will be too. Function rpois_rvec() also returns an rvec if a value for n_draw is supplied.

dpois_rvec(), ppois_rvec(), ppois_rvec() and rpois_rvec() use tidyverse vector recycling rules:

• Vectors of length 1 are recycled

• All other vectors must have the same size

Value

• If any of the arguments are rvecs, or if a value for n_draw is supplied, then an rvec; otherwise an ordinary R vector.

• Unlike base rpois(), rpois_rvec() always returns doubles.

See Also

• dpois(), ppois(), qpois(), rpois() Base R equivalents

• distributions All base R distributions

Examples

x <- rvec(list(c(3, 5),
               c(1, 2)))
dpois_rvec(x, lambda = 3)
ppois_rvec(x, lambda = 3)

rpois_rvec(n = 2,
           lambda = c(5, 10),
           n_draw = 1000)

rvec documentation built on Dec. 10, 2025, 5:08 p.m.