class DataBlock implements IDataBlock, Cloneable {

    public void fshift(int n) {
        int i0=end-inc, i1=beg+(n-1)*inc, ninc=n*inc;
        for (int i = i0; i != i1; i -= inc) {
            src[i] = src[i - ninc];
        }
    }

    public  DataBlock(final double[] data);
    public  DataBlock(final double[] data, final int beg, final int end, final int inc);
    public  DataBlock(final int n);
    public  DataBlock(final IReadDataBlock data);

}