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c-----------------------------------------------------------------------
c
c\Example-1
c ... Suppose want to solve A*x = lambda*x in regular mode
c ... so OP = A and B = I.
c ... Assume "call matvecA(n,x,y)" computes y = A*x
c ... Assume exact shifts are used
c ...
c ido = 0
c iparam(7) = 1
c
c %------------------------------------%
c | Beginning of reverse communication |
c %------------------------------------%
c 10 continue
c call _naupd ( ido, 'I', n, which, nev, tol, resid, ncv, v, ldv,
c & iparam, ipntr, workd, workl, lworkl, rwork, info )
c if (ido .eq. -1 .or. ido .eq. 1) then
c call matvecA (n, workd(ipntr(1)), workd(ipntr(2)))
c go to 10
c end if
c %------------------------------%
c | End of Reverse communication |
c %------------------------------%
c
c ... call _neupd to postprocess
c ... want the Ritz vectors set rvec = .true. else rvec = .false.
c call _neupd ( rvec, 'All', select, d, d(1,2), v, ldv,
c & sigmar, sigmai, workev, bmat, n, which, nev, tol,
c & resid, ncv, v, ldv, iparam, ipntr, workd, workl,
c & lworkl, rwork, info )
c stop
c end
c
c\Example-2
c ... Suppose want to solve A*x = lambda*x in shift-invert mode
c ... so OP = inv[A - sigma*I] and B = I
c ... Assume "call solve(n,rhs,x)" solves [A - sigma*I]*x = rhs
c ... Assume exact shifts are used
c ...
c ido = 0
c iaparam(7) = 3
c
c %------------------------------------%
c | Beginning of reverse communication |
c %------------------------------------%
c 10 continue
c call _naupd ( ido, 'I', n, which, nev, tol, resid, ncv, v, ldv,
c & iparam, ipntr, workd, workl, lworkl, rwork, info )
c if (ido .eq. -1 .or. ido .eq. 1) then
c call solve (n, workd(ipntr(1)), workd(ipntr(2)))
c go to 10
c end if
c %------------------------------%
c | End of Reverse communication |
c %------------------------------%
c
c ... call _neupd to postprocess
c ... want the Ritz vectors set rvec = .true. else rvec = .false.
c call _neupd ( rvec, 'All', select, d, d(1,2), v, ldv,
c & sigmar, sigmai, workev, bmat, n, which, nev, tol,
c & resid, ncv, v, ldv, iparam, ipntr, workd, workl,
c & lworkl, rwork, info )
c stop
c end
c
c\Example-3
c ... Suppose want to solve A*x = lambda*M*x in regular mode
c ... so OP = inv[M]*A and B = M.
c ... Assume "call matvecM(n,x,y)" computes y = M*x
c ... Assume "call matvecA(n,x,y)" computes y = A*x
c ... Assume "call solveM(n,rhs,x)" solves M*x = rhs
c ... Assume user will supplied shifts
c ...
c ido = 0
c iparam(7) = 2
c
c %------------------------------------%
c | Beginning of reverse communication |
c %------------------------------------%
c 10 continue
c call _naupd ( ido, 'G', n, which, nev, tol, resid, ncv, v, ldv,
c & iparam, ipntr, workd, workl, lworkl, rwork, info )
c if (ido .eq. -1 .or. ido .eq. 1) then
c call matvecA (n, workd(ipntr(1)), temp_array)
c call solveM (n, temp_array, workd(ipntr(2)))
c go to 10
c else if (ido .eq. 2) then
c call matvecM (n, workd(ipntr(1)), workd(ipntr(2)))
c go to 10
c
c ... delete this last conditional if want to use exact shifts
c else if (ido .eq. 3) then
c ... compute shifts and put in workl starting from the position
c ... pointed by ipntr(14).
c np = iparam(8)
c call scopy (np, shifts, 1, workl(ipntr(14), 1)
c go to 10
c end if
c %------------------------------%
c | End of Reverse communication |
c %------------------------------%
c
c ... call _neupd to postprocess
c ... want the Ritz vectors set rvec = .true. else rvec = .false.
c call _neupd ( rvec, 'All', select, d, d(1,2), v, ldv,
c & sigmar, sigmai, workev, bmat, n, which, nev, tol,
c & resid, ncv, v, ldv, iparam, ipntr, workd, workl,
c & lworkl, rwork, info )
c stop
c end
c
c\Example-4
c ... Suppose want to solve A*x = lambda*M*x in shift-invert mode
c ... so OP = inv[A - sigma*M]*M and B = M
c ... Assume "call matvecM(n,x,y)" computes y = M*x
c ... Assume "call solve(n,rhs,x)" solves [A - sigma*M]*x = rhs
c ... Assume exact shifts are used
c ...
c ido = 0
c iparam(7) = 3
c
c %------------------------------------%
c | Beginning of reverse communication |
c %------------------------------------%
c 10 continue
c call _naupd ( ido, 'G', n, which, nev, tol, resid, ncv, v, ldv,
c & iparam, ipntr, workd, workl, lworkl, rwork, info )
c if (ido .eq. -1) then
c call matvecM (n, workd(ipntr(1)), temp_array)
c call solve (n, temp_array, workd(ipntr(2)))
c go to 10
c else if (ido .eq. 1) then
c call solve (n, workd(ipntr(3)), workd(ipntr(2)))
c go to 10
c else if (ido .eq. 2) then
c call matvecM (n, workd(ipntr(1)), workd(ipntr(2)))
c go to 10
c end if
c %------------------------------%
c | End of Reverse communication |
c %------------------------------%
c
c ... call _neupd to postprocess
c ... want the Ritz vectors set rvec = .true. else rvec = .false.
c call _neupd ( rvec, 'All', select, d, d(1,2), v, ldv,
c & sigmar, sigmai, workev, bmat, n, which, nev, tol,
c & resid, ncv, v, ldv, iparam, ipntr, workd, workl,
c & lworkl, rwork, info )
c stop
c end
c\EndDoc
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