pdensity: pdensity

In sigbertklinke/exams2moodle: Access routines to XML Moodle files and helper routines to simplify generating exercises for Moodle from the 'exams' package

pdensity

Description

Creates a linear (power=1) or constant (power=0) density function in a interval

[a, b]

where a and b are sampled from x. It samples size elements without replacement and computes the value of the distribution function.

Usage

pdensity(x, size = 3, power = 1, tol = 1e-06)

Arguments

x	numeric: range of density with a=min(x, na.rm=TRUE) and b=max(x, na.rm=TRUE)
size	numeric: number of elements to be sampled (without replacement) from x
power	numeric: constant or linear density function
tol	numeric: disallow for density coefficients near zero (default: 1e-6). A negative value will allow for zero coefficients.

Value

a list with

• a the minimum of the interval

• i the maximum of the interval

• x the size sampled values

• fx the distribution function at x

• pcoeff polynomial (intercept = first value)

• qcoeff indefinite integral of the polynomial (intercept = first value)

• pint result of integral(pcoeff, c(a,b), 0:2)

Examples

pdensity(-5:5)
pdensity(-5:5, power=1)

sigbertklinke/exams2moodle documentation built on July 6, 2023, 3:26 p.m.