parse_fraction: Parse a String as a Fraction

In mrdwab/mathrrr: Basic School-type Math in R

Description

When provided a string representing a fraction, parse_fraction will parse the provided string to create a list with the class fraction applied to it. This will allow the parsed fraction to be used in subsequent calculations.

Usage

parse_fraction(string, improper = TRUE, reduce = TRUE)

Arguments

string	The input character to be parsed.
improper	Logical. Should the result be kept as an improper fraction? Defaults to TRUE.
reduce	Logical. Should unreduced fractions be simplified? Defaults to TRUE.

Value

A formatted list printed with print.fraction(). The list includes four elements:

• whole: The absolute value of the whole number part of the decimal. This is 0 if improper = TRUE.

• numerator: The numerator of the resulting fraction.

• denominator: The denominator of the resulting fraction.

• sign: -1 if the input is negative; 1 if the input is positive.

Note

The string can be entered either as an improper fraction (for example, "5/2") or as a simplified fraction (for example, "2 1/2"). Depending on how it is entered, the resulting list will have a value in "whole" or "whole" will be NULL.

Examples

parse_fraction("4/4")
parse_fraction("4/4", reduce = FALSE)

parse_fraction("32/4")
parse_fraction("34/4", reduce = FALSE)
parse_fraction("34/4", reduce = TRUE)
parse_fraction("34/4", improper = FALSE)

parse_fraction("4 2/4")
parse_fraction("4 2/4", TRUE, FALSE)
parse_fraction("4 2/4", FALSE)

mrdwab/mathrrr documentation built on July 20, 2020, 11:14 p.m.