symmIndex2vectorIndex: Array: make vector positions from symmetric array index

In ff: Memory-Efficient Storage of Large Data on Disk and Fast Access Functions

Array: make vector positions from symmetric array index

Description

make vector positions from (non-symmetric) array index respecting dim and fixdiag

Usage

symmIndex2vectorIndex(x, dim, fixdiag = NULL)

Arguments

x	a matrix[,1:2] with matrix subscripts
dim	the dimensions of the symmetric matrix
fixdiag	NULL assumes free diagonal, any value assumes fixed diagonal

Details

With fixdiag = NULL

Value

a vector of indices in seq_len(prod(dim(x)))

Author(s)

Jens Oehlschlägel

See Also

arrayIndex2vectorIndex

Examples

  symmIndex2vectorIndex(rbind(
   c(1,1)
  ,c(1,10)
  ,c(10,1)
  ,c(10,10)
  ), dim=c(10,10))
  symmIndex2vectorIndex(rbind(
   c(1,1)
  ,c(1,10)
  ,c(10,1)
  ,c(10,10)
  ), dim=c(10,10), fixdiag=1)

ff documentation built on Feb. 16, 2023, 7:48 p.m.