Program f07agfe ! F07AGF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: dgecon, dgetrf, dlange => f06raf, nag_wp, x02ajf ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 Character (1), Parameter :: norm = '1' ! .. Local Scalars .. Real (Kind=nag_wp) :: anorm, rcond Integer :: i, info, lda, n ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: a(:,:), work(:) Integer, Allocatable :: ipiv(:), iwork(:) ! .. Executable Statements .. Write (nout,*) 'F07AGF Example Program Results' ! Skip heading in data file Read (nin,*) Read (nin,*) n lda = n Allocate (a(lda,n),work(4*n),ipiv(n),iwork(n)) ! Read A from data file Read (nin,*)(a(i,1:n),i=1,n) ! Compute norm of A ! f06raf is the NAG name equivalent of the LAPACK auxiliary dlange anorm = dlange(norm,n,n,a,lda,work) ! Factorize A ! The NAG name equivalent of dgetrf is f07adf Call dgetrf(n,n,a,lda,ipiv,info) Write (nout,*) If (info==0) Then ! Estimate condition number ! The NAG name equivalent of dgecon is f07agf Call dgecon(norm,n,a,lda,anorm,rcond,work,iwork,info) If (rcond>=x02ajf()) Then Write (nout,99999) 'Estimate of condition number =', & 1.0E0_nag_wp/rcond Else Write (nout,*) 'A is singular to working precision' End If Else Write (nout,*) 'The factor U is singular' End If 99999 Format (1X,A,1P,E10.2) End Program f07agfe