question: protected void initializeDataExtends ( Relation < NumberVector > relation , int dim , double [ ] min , double [ ] extend ) { assert ( min . length == dim && extend . length == dim ) ; if ( minima == null || maxima == null || minima . length == 0 || maxima . length == 0 ) { double [ ] [ ] minmax = RelationUtil . computeMinMax ( relation ) ; final double [ ] dmin = minmax [ 0 ] , dmax = minmax [ 1 ] ; for ( int d = 0 ; d < dim ; d ++ ) { min [ d ] = dmin [ d ] ; extend [ d ] = dmax [ d ] - dmin [ d ] ; } return ; } if ( minima . length == dim ) { System . arraycopy ( minima , 0 , min , 0 , dim ) ; } else if ( minima . length == 1 ) { Arrays . fill ( min , minima [ 0 ] ) ; } else { throw new AbortException ( "Invalid minima specified: expected " + dim + " got minima dimensionality: " + minima . length ) ; } if ( maxima . length == dim ) { for ( int d = 0 ; d < dim ; d ++ ) { extend [ d ] = maxima [ d ] - min [ d ] ; } return ; } else if ( maxima . length == 1 ) { for ( int d = 0 ; d < dim ; d ++ ) { extend [ d ] = maxima [ 0 ] - min [ d ] ; } return ; } else { throw new AbortException ( "Invalid maxima specified: expected " + dim + " got maxima dimensionality: " + maxima . length ) ; } }
target:  Initialize the uniform sampling area.