public final double set0(int idx, double d) {
    setWrite();
    if( _chk2.set_impl(idx,d) ) return d;
    (_chk2 = inflate_impl(new NewChunk(this))).set_impl(idx,d);
    return d;
  }
public final double set0 ( int idx , double d ) { setWrite ( ) ; if ( _chk2 . set_impl ( idx , d ) ) return d ; ( _chk2 = inflate_impl ( new NewChunk ( this ) ) ) . set_impl ( idx , d ) ; return d ; }
Set a double element in a chunk given a 0-based chunk local index.