Program f07fsfe ! F07FSF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: nag_wp, x04dbf, zpotrf, zpotrs ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Integer :: i, ifail, info, lda, ldb, n, nrhs Character (1) :: uplo ! .. Local Arrays .. Complex (Kind=nag_wp), Allocatable :: a(:,:), b(:,:) Character (1) :: clabs(1), rlabs(1) ! .. Executable Statements .. Write (nout,*) 'F07FSF Example Program Results' ! Skip heading in data file Read (nin,*) Read (nin,*) n, nrhs lda = n ldb = n Allocate (a(lda,n),b(ldb,nrhs)) ! Read A and B from data file Read (nin,*) uplo If (uplo=='U') Then Read (nin,*)(a(i,i:n),i=1,n) Else If (uplo=='L') Then Read (nin,*)(a(i,1:i),i=1,n) End If Read (nin,*)(b(i,1:nrhs),i=1,n) ! Factorize A ! The NAG name equivalent of zpotrf is f07frf Call zpotrf(uplo,n,a,lda,info) Write (nout,*) Flush (nout) If (info==0) Then ! Compute solution ! The NAG name equivalent of zpotrs is f07fsf Call zpotrs(uplo,n,nrhs,a,lda,b,ldb,info) ! Print solution ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 Call x04dbf('General',' ',n,nrhs,b,ldb,'Bracketed','F7.4', & 'Solution(s)','Integer',rlabs,'Integer',clabs,80,0,ifail) Else Write (nout,*) 'A is not positive definite' End If End Program f07fsfe