int i;
for(i=2;i<5;i++)
{
        //define the starting row of range
	int x=7000*(i-2)+1;
	//define the ending row of range
	int y=x+6999;
        //ra is the range to be extracted, rb is the new range to put extracted data
	range ra = col(1)[$(x):$(y)];
	range rb = col($(i));
	rb=ra;
}