Program f08ajfe ! F08AJF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: dgelqf, dorglq, nag_wp, x04caf ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Integer :: i, ifail, info, lda, lwork, m, n Character (30) :: title ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: a(:,:), tau(:), work(:) ! .. Executable Statements .. Write (nout,*) 'F08AJF Example Program Results' ! Skip heading in data file Read (nin,*) Read (nin,*) m, n lda = m lwork = 64*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 LQ factorization of A ! The NAG name equivalent of dgelqf is f08ahf Call dgelqf(m,n,a,lda,tau,work,lwork,info) ! Form the leading M rows of Q explicitly ! The NAG name equivalent of dorglq is f08ajf Call dorglq(m,n,m,a,lda,tau,work,lwork,info) ! Print the leading M rows of Q only Write (nout,*) Write (title,99999) m Flush (nout) ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 Call x04caf('General',' ',m,n,a,lda,title,ifail) 99999 Format ('The leading ',I2,' rows of Q') End Program f08ajfe