Program f07wefe ! F07WEF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. 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