R: Array: make array from index vector positions

vectorIndex2arrayIndex {ff} | R Documentation

## Array: make array from index vector positions

### Description

make array from index vector positions respecting dim and dimorder

### Usage

    vectorIndex2arrayIndex(x, dim = NULL, dimorder = NULL, vw = NULL)

### Arguments

`x` | a vector of indices in `1:prod(dim)`
`dim` | NULL or `dim`
`dimorder` | NULL or `dimorder`
`vw` | NULL or integer matrix[2,m], see details

### Details

The fastest rotating dimension is dim[dimorder[1]], then dim[dimorder[2]], and so forth.
The parameters 'x' and 'dim' may refer to a subarray of a larger array, in this case, the array indices 'x' are interpreted as 'vw[1,] + x' within the larger array 'vw[1,] + x + vw[2,]'.

### Value

an n by m matrix with n m-dimensional array indices

### Author(s)

Jens Oehlschlägel

### See Also

`vector2array`, `arrayIndex2vectorIndex` , `symmIndex2vectorIndex`

### Examples

      matrix(1:12, 3, 4)
      vectorIndex2arrayIndex(1:12, dim=3:4)
      vectorIndex2arrayIndex(1:12, dim=3:4, dimorder=2:1)
      matrix(1:30, 5, 6)
      vectorIndex2arrayIndex(c(6L, 7L, 8L, 11L, 12L, 13L, 16L, 17L, 18L, 21L, 22L, 23L)
    , vw=rbind(c(0,1), c(3,4), c(2,1)))
      vectorIndex2arrayIndex(c(2L, 8L, 14L, 3L, 9L, 15L, 4L, 10L, 16L, 5L, 11L, 17L)
    , vw=rbind(c(0,1), c(3,4), c(2,1)), dimorder=2:1)

[Package ff version 2.2-13 Index]