Program f02wufe ! F02WUF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: f02wuf, nag_wp, x04cbf ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Integer :: i, ifail, lda, ldb, ldq, lwork, n, & ncolb Logical :: wantp, wantq ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: a(:,:), b(:), q(:,:), sv(:), work(:) Character (1) :: clabs(1), rlabs(1) ! .. Executable Statements .. Write (nout,*) 'F02WUF Example Program Results' Write (nout,*) ! Skip heading in data file Read (nin,*) Read (nin,*) n, ncolb lda = n ldb = n ldq = n lwork = 5*(n-1) Allocate (a(lda,n),b(ldb),q(ldq,n),sv(n),work(lwork)) Read (nin,*)(a(i,i:n),i=1,n) Read (nin,*) b(1:n) wantq = .True. wantp = .True. ! ifail: behaviour on error exit ! =0 for hard exit, =1 for quiet-soft, =-1 for noisy-soft ifail = 0 ! Find the SVD of A Call f02wuf(n,a,lda,ncolb,b,ldb,wantq,q,ldq,sv,wantp,work,ifail) Write (nout,*) 'Singular value decomposition of A' Write (nout,*) Write (nout,*) 'Singular values' Write (nout,99999) sv(1:n) Write (nout,*) Flush (nout) ifail = 0 Call x04cbf('General',' ',n,n,q,ldq,'F8.4', & 'Left-hand singular vectors, by column','N',rlabs,'N',clabs,80,0, & ifail) Write (nout,*) Write (nout,*) 'Right-hand singular vectors, by column' Do i = 1, n Write (nout,99999) a(1:n,i) End Do Write (nout,*) Write (nout,*) 'Vector Q''*B' Write (nout,99999) b(1:n) 99999 Format (1X,3(1X,F8.4)) End Program f02wufe