Program f07hrfe ! F07HRF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: nag_wp, x04dff, zpbtrf ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Integer :: i, ifail, info, j, kd, ldab, n Character (1) :: uplo ! .. Local Arrays .. Complex (Kind=nag_wp), Allocatable :: ab(:,:) Character (1) :: clabs(1), rlabs(1) ! .. Intrinsic Procedures .. Intrinsic :: max, min ! .. Executable Statements .. Write (nout,*) 'F07HRF Example Program Results' ! Skip heading in data file Read (nin,*) Read (nin,*) n, kd ldab = kd + 1 Allocate (ab(ldab,n)) ! Read A from data file Read (nin,*) uplo If (uplo=='U') Then Do i = 1, n Read (nin,*)(ab(kd+1+i-j,j),j=i,min(n,i+kd)) End Do Else If (uplo=='L') Then Do i = 1, n Read (nin,*)(ab(1+i-j,j),j=max(1,i-kd),i) End Do End If ! Factorize A ! The NAG name equivalent of zpbtrf is f07hrf Call zpbtrf(uplo,n,kd,ab,ldab,info) Write (nout,*) Flush (nout) If (info==0) Then ! Print factor ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 If (uplo=='U') Then Call x04dff(n,n,0,kd,ab,ldab,'Bracketed','F7.4','Factor','Integer', & rlabs,'Integer',clabs,80,0,ifail) Else If (uplo=='L') Then Call x04dff(n,n,kd,0,ab,ldab,'Bracketed','F7.4','Factor','Integer', & rlabs,'Integer',clabs,80,0,ifail) End If Else Write (nout,*) 'A is not positive definite' End If End Program f07hrfe