question: public static void ignorm ( double c1 [ ] , double c2 [ ] , int m , double ng ) { if ( ng != 0.0 ) { double k = Math . pow ( c1 [ 0 ] , ng ) ; for ( int i = m ; i >= 1 ; i -- ) c2 [ i ] = k * c1 [ i ] ; c2 [ 0 ] = ( k - 1.0 ) / ng ; } else { System . arraycopy ( c1 , 1 , c2 , 1 , m - 1 ) ; c2 [ 0 ] = Math . log ( c1 [ 0 ] ) ; } }
target:  ignorm: inverse gain normalization