Program f08cwfe ! F08CWF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: nag_wp, x04dbf, zgerqf, zungrq ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nb = 64, nin = 5, nout = 6 ! .. Local Scalars .. Integer :: i, ifail, info, lda, lwork, m, n Character (26) :: title ! .. Local Arrays .. Complex (Kind=nag_wp), Allocatable :: a(:,:), tau(:), work(:) Character (1) :: clabs(1), rlabs(1) ! .. Executable Statements .. Write (nout,*) 'F08CWF Example Program Results' Write (nout,*) ! Skip heading in data file Read (nin,*) Read (nin,*) m, n lda = m lwork = nb*m Allocate (a(lda,n),tau(n),work(lwork)) ! Read A from data file Read (nin,*)(a(i,1:n),i=1,m) ! Compute the RQ factorization of A ! The NAG name equivalent of zgerqf is f08cvf Call zgerqf(m,n,a,lda,tau,work,lwork,info) ! Form the leading M rows of Q explicitly ! The NAG name equivalent of zungrq is f08cwf Call zungrq(m,n,m,a,lda,tau,work,lwork,info) ! Form the heading for X04DBF Write (title,99999) m Flush (nout) ! Print the leading M rows of Q ! 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',title,'Integer', & rlabs,'Integer',clabs,80,0,ifail) 99999 Format ('The leading ',I4,' rows of Q') End Program f08cwfe