expr3present: indicates inclusion of character string

In rbsb: set of ancillary functions

Description

Checks if some string(s) belong(s) to a series of strings. When exact is FALSE, returns TRUE if the character string sch is included at least once into the character string ch.
sch can be a vector, in that case, the check is made for each of its components. According to how the returned value is vectorial or scalar. When sch is zero length then TRUE is returned but if not and ch is zero length then FALSE is returned.

Usage

expr3present(sch, ch, exact=FALSE, how="a")

Arguments

sch	(character) the character string(s) to be found.
ch	(character) the character string(s) to investigate.
exact	When exact, one component must be strictly identical, if not a subtring is sufficient.
how	Indicates what to do when length(sch)>1. The choice are 'v': a logical vector gives back each check independently; '1': returns TRUE when at least one of the component belongs to the series ch and 'a' when all components must comply to get TRUE.

Value

A logical vector with length of sch.

Examples

 rbsb3k("RESET"); # needed only for R checking, to be forgotten
 expr3present('a', 'non');
 expr3present('o', c('non', 'oui'));
 expr3present(c("o", "oui"), c('non', 'oui'));
 expr3present(c("o", "oui"), c('non', 'oui'), how="v");
 expr3present(c("A[SEX]", "A[AGE]"), c("A[AGE]", "A[SEX]"), how="a")

rbsb documentation built on May 2, 2019, 4:41 p.m.