PROGRAM f07wefe ! F07WEF Example Program Text ! Mark 23 Release. NAG Copyright 2011. ! .. Use Statements .. USE nag_library, ONLY : dpftrf, dpftrs, nag_wp, x04caf ! .. Implicit None Statement .. IMPLICIT NONE ! .. Parameters .. INTEGER, PARAMETER :: nin = 5, nout = 6 ! .. Local Scalars .. INTEGER :: i, ifail, info, ldb, lena, n, nrhs CHARACTER (1) :: transr, uplo ! .. Local Arrays .. REAL (KIND=nag_wp), ALLOCATABLE :: a(:), b(:,:) ! .. Executable Statements .. WRITE (nout,*) 'F07WEF Example Program Results' ! Skip heading in data file READ (nin,*) READ (nin,*) n, nrhs, uplo, transr lena = n*(n+1)/2 ldb = n ALLOCATE (a(lena),b(ldb,nrhs)) ! Read A and B from data file READ (nin,*) a(1:lena) DO i = 1, n READ (nin,*) b(i,1:nrhs) END DO ! Factorize A info = 0 ! The NAG name equivalent of dpftrf is f07wdf CALL dpftrf(transr,uplo,n,a,info) WRITE (nout,*) FLUSH (nout) IF (info==0) THEN ! Compute solution ! The NAG name equivalent of dpftrs is f07wef CALL dpftrs(transr,uplo,n,nrhs,a,b,ldb,info) ! Print solution ifail = 0 CALL x04caf('General',' ',n,nrhs,b,ldb,'Solution(s)',ifail) ELSE WRITE (nout,*) 'A is not positive definite' END IF END PROGRAM f07wefe