Unwhich: Inverse Which

In DescTools: Tools for Descriptive Statistics

Inverse Which

Description

The inverse function to which creates a logical vector/matrix from indices.

Usage

Unwhich(idx, n, useNames = TRUE)

Arguments

idx	the indices as returned by which.
n	integer, the length of the original vector.
useNames	logical, determining if the names of the indices should be preserved.

Value

a logical vector of the length n, with TRUE on the positions i.

Author(s)

Nick Sabbe

References

https://stackoverflow.com/questions/7659833/inverse-of-which

See Also

which

Examples

ll <- c(TRUE, FALSE, TRUE, NA, FALSE, FALSE, TRUE)
names(ll) <- letters[seq(ll)]
i <- which(ll)
# back again (loosing the names of the FALSEs)
Unwhich(i, length(ll))

DescTools documentation built on Nov. 20, 2023, 5:08 p.m.