array2vec: Converting array and vector Indices Calculate the vector...
In arrayhelpers: Convenience Functions for Arrays

Description Usage Arguments Value Author(s) See Also Examples

arrays are numerics with a dim attribute and are stored with the first index moving fastest (i.e. by column). They can be indexed both ways.

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array2vec(iarr, dim)

vec2array(ivec, dim)

`iarr`	vector with the indices into the array dimensions
`dim`	vector with the array dimensions, as returned by `dim (x)`
`ivec`	scalar with the index into the vector

array2vec returns a scalar, vec2array a matrix.

C. Beleites

see Extract on the difference of indexing an array with a vector or a matrix.

arr <- array (rnorm (24), dim = 2 : 4)
arr

v <- matrix(c(2, 2, 2), nrow = 1)
i <- array2vec (v, dim = dim (arr))
i
arr[v]
arr[i]

arr[c(2, 2, 2)] ## indexing with a vector
arr[2]

 
i <- 14
v <- vec2array (i, dim = dim (arr))
v
arr [v]
arr [i]