transformif: transformif

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

transformif

Description

Transforms x if cond is TRUE by \log(a+b*x) if p==0 and (a+b*x)^p) otherwise. The transformation can be either applied to each element of x or to all elements of x.

Usage

transformif(x, cond, a = -abs(min(x)), b = 1, p = 1)

Arguments

x	vector: values
cond	logical: condition if transformation should be applied
a	numeric: shift (default: -abs(min(x)))
b	numeric: scale (default: 1))
p	numeric: power (default: 1))

Value

transformed vector

Examples

x <- rnorm(5)
transformif(x, min(x)<0)  # all transformed elements > 0
transformif(x, x<0)       # only negative elements are transformed

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