plotDistr: Plot a probability density, mass, or distribution function.

In RcmdrMisc: R Commander Miscellaneous Functions

Plot a probability density, mass, or distribution function.

Description

Plot a probability density, mass, or distribution function.

Usage

plotDistr(
  x,
  p,
  discrete = FALSE,
  cdf = FALSE,
  regions = NULL,
  col = "gray",
  legend = TRUE,
  legend.pos = "topright",
  ...
)

Arguments

x	horizontal coordinates
p	vertical coordinates
discrete	is the random variable discrete?
cdf	is this a cumulative distribution (as opposed to mass) function?
regions	for continuous distributions only, if non-NULL, a list of regions to fill with color col; each element of the list is a pair of x values with the minimum and maximum horizontal coordinates of the corresponding region.
col	color for plot, col may be a single value or a vector.
legend	plot a legend of the regions (default TRUE).
legend.pos	position for the legend (see legend, default "topright").
...	arguments to be passed to plot.

Details

This function plots a probability density, mass, or distribution function, adapting the form of the plot as appropriate.

Value

Produces a plot; returns NULL invisibly.

Author(s)

John Fox

Examples

x <- seq(-4, 4, length=100)
plotDistr(x, dnorm(x), xlab="Z", ylab="p(z)", main="Standard Normal Density")
plotDistr(x, dnorm(x), xlab="Z", ylab="p(z)", main="Standard Normal Density",
          region=list(c(1.96, Inf), c(-Inf, -1.96)), col=c("red", "blue"), new = TRUE)
plotDistr(x, dnorm(x), xlab="Z", ylab="p(z)", main="Standard Normal Density",
          region=list(c(qnorm(0), qnorm(.025)), c(qnorm(.975), qnorm(1)))) # same

x <- 0:10
plotDistr(x, pbinom(x, 10, 0.5), xlab="successes", discrete=TRUE, cdf=TRUE,
          main="Binomial Distribution Function, p=0.5, n=10")

RcmdrMisc documentation built on Jan. 8, 2026, 9:06 a.m.