Predicate Helper Functions for Testing Simple Atomic Vectors.

Vek

Predicate Helper Functions for Testing Atomic Vectors in R

Installation

install.packages("vek")

About

All functions take a single argument x and check whether it's of the target type of base-R atomic vector, returning TRUE or FALSE. Some additionally check for value. Classes that extend any base-R atomic vector return FALSE. Vectors that carry any attributes other than 'names' return FALSE.

Function names may include a suffix that encodes what additional conditions are evaluated. A select combination of these conditions is provided for each type. Naming scheme:

• n: no 'names' attribute
• x: no NA (type specific)
• y: no NaN
• z: no Inf or -Inf
• b: no blank characters, i.e. ""
• 1: is of length 1

For example:

• is_dbl_vec(x) evaluates whether x is a base-R typeof double atomic vector, of any length.
• is_dbl_vec_xz(x) will additionaly evaluate whether x contains no NA nor Inf values. Note, NaN values are still allowed here, which is dissimilar to behavior from base-R functions like is.na(x) or anyNA(x), wherein both NA and NaN values yield TRUE.
• is_num_vec_xyz1(x) effectively evaluates whether x is a single real number.

Supported types: logical, integer, double, numeric, and character.