DescTools (version 0.99.37)

Unwhich: 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.

References

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

See Also

which

Examples

# NOT RUN {
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))
# }