Program f03bnfe ! F03BNF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: f03bnf, nag_wp, x04daf, zgetrf ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Real (Kind=nag_wp), Parameter :: two = 2.0_nag_wp Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Complex (Kind=nag_wp) :: d Integer :: i, ifail, info, lda, n ! .. Local Arrays .. Complex (Kind=nag_wp), Allocatable :: a(:,:) Integer :: id(2) Integer, Allocatable :: ipiv(:) ! .. Intrinsic Procedures .. Intrinsic :: aimag, real ! .. Executable Statements .. Write (nout,*) 'F03BNF Example Program Results' ! Skip heading in data file Read (nin,*) Read (nin,*) n lda = n Allocate (a(lda,n),ipiv(n)) Read (nin,*)(a(i,1:n),i=1,n) ! LU Factorize A ! The NAG name equivalent of zgetrf is f07arf Call zgetrf(n,n,a,lda,ipiv,info) Write (nout,*) Flush (nout) ifail = 0 Call x04daf('g','n',n,n,a,lda,'Array A after factorization',ifail) Write (nout,*) Write (nout,*) 'Pivots' Write (nout,99999) ipiv(1:n) Write (nout,*) Flush (nout) ifail = 0 Call f03bnf(n,a,lda,ipiv,d,id,ifail) Write (nout,99998) d, id Write (nout,*) Write (nout,99997) two**id(1)*real(d), two**id(2)*aimag(d) 99999 Format (1X,8(1X,I13)) 99998 Format (1X,'D = (',F13.5,',',F13.5,'), ID = (',I0,', ',I0,')') 99997 Format (1X,'Value of determinant = (',E13.5,',',E13.5,')') End Program f03bnfe