PROGRAM f07arfe ! F07ARF Example Program Text ! Mark 23 Release. NAG Copyright 2011. ! .. Use Statements .. USE nag_library, ONLY : nag_wp, x04dbf, zgetrf ! .. Implicit None Statement .. IMPLICIT NONE ! .. Parameters .. INTEGER, PARAMETER :: nin = 5, nout = 6 ! .. Local Scalars .. INTEGER :: i, ifail, info, lda, m, n ! .. Local Arrays .. COMPLEX (KIND=nag_wp), ALLOCATABLE :: a(:,:) INTEGER, ALLOCATABLE :: ipiv(:) CHARACTER (1) :: clabs(1), rlabs(1) ! .. Intrinsic Functions .. INTRINSIC min ! .. Executable Statements .. WRITE (nout,*) 'F07ARF Example Program Results' ! Skip heading in data file READ (nin,*) READ (nin,*) m, n lda = m ALLOCATE (a(lda,n),ipiv(n)) ! Read A from data file READ (nin,*) (a(i,1:n),i=1,m) ! Factorize A ! The NAG name equivalent of zgetrf is f07arf CALL zgetrf(m,n,a,lda,ipiv,info) ! Print details of factorization WRITE (nout,*) FLUSH (nout) ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 CALL x04dbf('General',' ',m,n,a,lda,'Bracketed','F7.4', & 'Details of factorization','Integer',rlabs,'Integer',clabs,80,0, & ifail) ! Print pivot indices WRITE (nout,*) WRITE (nout,*) 'IPIV' WRITE (nout,99999) ipiv(1:min(m,n)) IF (info/=0) WRITE (nout,*) 'The factor U is singular' 99999 FORMAT ((1X,I12,3I18)) END PROGRAM f07arfe