question: private static void printMatrix ( int [ ] [ ] matrix ) { Log . v ( TAG , "\tprintMap:" ) ; int m = matrix . length ; int n = matrix [ 0 ] . length ; for ( int j = 0 ; j < n ; j ++ ) { String colY = "\t\t" ; for ( int i = 0 ; i < m ; i ++ ) { colY += String . format ( "%3d" , matrix [ i ] [ j ] ) ; } Log . v ( TAG , colY ) ; } }
target:  Only used for debugging.