CLOSED BOOK CLASS QUIZ GP210	September 22, 2008

your name_________________________________________

Answer on this sheet.  Duration 10 minutes.

Given a data volume data(t,s,g) that is a function of t=time, g=geophone,
and s=shot, what is the definition of a field profile?



The subroutine below computes a difference approximation
to the first derivative operator.  Write the matrix that represents it.
















Enter the conjugate code below:

subroutine ruffen1( conj,    n, pp, qq     )
integer i,          conj,       n
real                         pp(n), qq( n-1)
call conjnull(      conj, 0, pp,n,  qq, n-1)
do i= 1, n-1 {
	if( conj == 0 )
		qq(i) = qq(i) + pp(i+1) - pp(i)
	else {
		****************  WHAT GOES IN HERE ? ***********************
		*                                                           *
		*                                                           *
		*                                                           *
		*                                                           *
		*                                                           *
		*                                                           *
		*                                                           *
		*                                                           *
		*                                                           *
		*                                                           *
		*                                                           *
		*                                                           *
		*************************************************************
		}
	}
return;	end