Program f07ajfe ! F07AJF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: dgetrf, dgetri, nag_wp, x04caf ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Integer :: i, ifail, info, lda, lwork, n ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: a(:,:), work(:) Integer, Allocatable :: ipiv(:) ! .. Executable Statements .. Write (nout,*) 'F07AJF Example Program Results' ! Skip heading in data file Read (nin,*) Read (nin,*) n lda = n lwork = 64*n Allocate (a(lda,n),work(lwork),ipiv(n)) ! Read A from data file Read (nin,*)(a(i,1:n),i=1,n) ! Factorize A ! The NAG name equivalent of dgetrf is f07adf Call dgetrf(n,n,a,lda,ipiv,info) Write (nout,*) Flush (nout) If (info==0) Then ! Compute inverse of A ! The NAG name equivalent of dgetri is f07ajf Call dgetri(n,a,lda,ipiv,work,lwork,info) ! Print inverse ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 Call x04caf('General',' ',n,n,a,lda,'Inverse',ifail) Else Write (nout,*) 'The factor U is singular' End If End Program f07ajfe