Program f07wrfe ! F07WRF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: nag_wp, x04dbf, zpftrf, ztfttr ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Integer :: ifail, info, ldf, lena, n Character (1) :: transr, uplo ! .. Local Arrays .. Complex (Kind=nag_wp), Allocatable :: a(:), f(:,:) Character (1) :: clabs(1), rlabs(1) ! .. Executable Statements .. Write (nout,*) 'F07WRF Example Program Results' ! Skip heading in data file Read (nin,*) Read (nin,*) n, uplo, transr lena = n*(n+1)/2 ldf = n Allocate (a(lena),f(ldf,n)) ! Read A from data file Read (nin,*) a(1:lena) ! Factorize A ! The NAG name equivalent of zpftrf is f07wrf Call zpftrf(transr,uplo,n,a,info) Write (nout,*) Flush (nout) If (info==0) Then ! Convert and print factor ! The NAG name equivalent of ztfttr is f01vhf Call ztfttr(transr,uplo,n,a,f,ldf,info) ifail = 0 Call x04dbf(uplo,'Nonunit',n,n,f,ldf,'Bracketed','F7.4','Factor', & 'Integer',rlabs,'Integer',clabs,80,0,ifail) Else Write (nout,*) 'A is not positive definite' End If End Program f07wrfe