symmIndex2vectorIndex: Array: make vector positions from symmetric array index

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

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 1:prod(dim(x))

Author(s)

Jens Oehlschl<c3><a4>gel

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)

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