vector2array: Array: make array from vector

In kindlychung/ff: memory-efficient storage of large data on disk and fast access functions

Description

makes array from vector respecting dim and dimorder

Usage

vector2array(x, dim, dimorder = NULL)

Arguments

x	an input vector, recyled if needed
dim	dim
dimorder	dimorder

Details

FILLS vector into array of dim where fastest rotating is dim[dimorder[1]], next is dim[dimorder[2]] and so forth. This is a generalization of converting vector to matrix(, byrow=TRUE). NOTE that the result is a ram array always stored in STANDARD dimorder !!! In this usage we sometimes term the dimorder 'bydim' because it does not change the physical layout of the result, rather bydim refers to the dimorder in which to interpret the vector (not the result). In ff, update and clone we have 'bydim' to contrast it from 'dimorder', the latter describing the layout of the file.

Value

a suitable array

Author(s)

Jens Oehlschl<c3><a4>gel

See Also

array2vector, vectorIndex2arrayIndex

Examples

  vector2array(1:12, dim=c(3, 4))               # matrix(1:12, 3, 4)
  vector2array(1:12, dim=c(3, 4), dimorder=2:1) # matrix(1:12, 3, 4, byrow=TRUE)

kindlychung/ff documentation built on May 20, 2019, 9:58 a.m.