epiphy (version 0.5.0)

indAndSub: Retrieve vector or array indices

Description

ind2sub is just an alias for arrayInd. sub2ind is the reverse of ind2sub.

Usage

ind2sub(ind, .dim, .dimnames = NULL, useNames = FALSE)
sub2ind(sub, .dim)

Value

See arrayInd.

Arguments

ind

Vector indices.

.dim

dim(.) integer vector

.dimnames

optional list of character dimnames(.). If useNames is true, to be used for constructing dimnames for arrayInd() (and hence, which(*, arr.ind=TRUE)). If names(.dimnames) is not empty, these are used as column names. .dimnames[[1]] is used as row names.

useNames

logical indicating if the value of arrayInd() should have (non-null) dimnames at all.

sub

Array/matrix indices.

Examples

set.seed(12345)
mat <- matrix(round(runif(6, min = 0, max = 10)), nrow = 2, ncol = 3)
ind2sub(4, dim(mat))
sub2ind(c(2, 2), dim(mat))
subs <- as.matrix(expand.grid(1:2,2:3))
sub2ind(subs, dim(mat))