indAndSub: Retrieve vector or array indices
In chgigot/cgmisc: CGigot Miscellaneous

Description Usage Arguments Details Examples

ind2sub is a synonym for arrayInd in base package.

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

sub2ind(sub, .dim)

`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.

ind2sub is just an alias for arrayInd

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))