editrules (version 2.2-0)

blockIndex: Determine list of indices indicating blocks in logical matrix

Description

Determine list of indices indicating blocks in logical matrix

Usage

blockIndex(D)

Value

list of row indices in D indicating independent blocks. Empty rows (i.e. every column FALSE) are ignored.

Examples

# three seperate blocks, will they be found?
E <- editmatrix( c( "x1 + x2 == x3"
                  , "x3 + x4 == x5"
                  , "x5 + x6 == x7"
                  , "y1 + y2 == y3"
                  , "z1 + z2 == z3")
               )
blocks(E)

# four seperate blocks, will they be found?
E <- editmatrix( c( "x1 + x2 == x3"
                  , "x3 + x4 == x5"
                  , "x8 + x6 == x7"
                  , "y1 + y2 == y3"
                  , "z1 + z2 == z3")
               )
blocks(E)

# two categorical blocks, will they be found?
E <- editarray(c(
 "x \%in\% c('a','b','c')",
 "y \%in\% c('d','e')",
 "z \%in\% c('f','g')",
 "u \%in\% c('w','t')",
 "if ( x == 'a') y != 'd'",
 "if ( z == 'f') u != 'w'")
)
blocks(E)