WildcardGlobbing: Row selection by wildcard/globbing

In SSBtools: Statistics Norway's Miscellaneous Tools

Row selection by wildcard/globbing

Description

The selected rows match combined requirements for all variables.

Usage

WildcardGlobbing(x, wg, sign = TRUE, invert = "!")

Arguments

x	data.frame with character data
wg	data.frame with wildcard/globbing
sign	When FALSE, the result is inverted.
invert	Character to invert each single selection.

Details

This function is used by HierarchicalWildcardGlobbing and WildcardGlobbingVector and make use of grepl and glob2rx.

Value

Logical vector defining subset of rows.

Author(s)

Øyvind Langsrud

Examples

# Create data input
data(precip)
data(mtcars)
x <- data.frame(car = rownames(mtcars)[rep(1:NROW(mtcars), each = 35)], city = names(precip), 
                stringsAsFactors = FALSE)

# Create globbing/wildcards input
wg <- data.frame(rbind(c("Merc*", "C*"), c("F*", "??????"), c("!?????????*", "!???????*")), 
                 stringsAsFactors = FALSE)
names(wg) <- names(x)

# Select the following combinations:
# - Cars starting with Merc and cities starting with C
# - Cars starting with F and six-letter cities 
# - Cars with less than nine letters and cities with less than seven letters
x[WildcardGlobbing(x, wg), ]

SSBtools documentation built on Oct. 30, 2024, 5:09 p.m.