Program f08mdfe ! F08MDF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: dbdsdc, nag_wp ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Integer :: info, ldb, ldu, ldvt, n ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: b(:,:), d(:), e(:), u(:,:), vt(:,:), & work(:) Real (Kind=nag_wp) :: q(1) Integer :: iq(1) Integer, Allocatable :: iwork(:) ! .. Executable Statements .. Write (nout,*) 'F08MDF Example Program Results' Write (nout,*) Flush (nout) ! Skip heading in data file Read (nin,*) Read (nin,*) n ldb = n ldu = n ldvt = n Allocate (b(ldb,n),d(n),e(n-1),u(ldu,n),vt(ldvt,n),work(n*(3*n+ & 4)),iwork(8*n)) ! Read the bidiagonal matrix B from data file, first ! the diagonal elements, and then the off diagonal elements Read (nin,*) d(1:n) Read (nin,*) e(1:n-1) ! Calculate the singular values and left and right singular ! vectors of B. ! The NAG name equivalent of dbdsdc is f08mdf Call dbdsdc('Upper','I',n,d,e,u,ldu,vt,ldvt,q,iq,work,iwork,info) If (info==0) Then ! Print the singular values of B. Write (nout,*) 'Singular values of B:' Write (nout,99999) d(1:n) Else Write (nout,99998) '** F08MDF/DBDSDC failed with INFO = ', info End If 99999 Format (1X,4(3X,F11.4)) 99998 Format (1X,A,I10) End Program f08mdfe