! E04FYF Example Program Text ! Mark 23 Release. NAG Copyright 2011. MODULE e04fyfe_mod ! E04FYF Example Program Module: ! Parameters and User-defined Routines ! .. Use Statements .. USE nag_library, ONLY : nag_wp ! .. Implicit None Statement .. IMPLICIT NONE ! .. Parameters .. INTEGER, PARAMETER :: m = 15, n = 3, nin = 5, & nout = 6, nt = 3 INTEGER, PARAMETER :: & lw = 7*n + n*n + 2*m*n + 3*m + n*(n-1)/2 ! .. Local Arrays .. REAL (KIND=nag_wp) :: t(m,nt), y(m) CONTAINS SUBROUTINE lsfun1(m,n,xc,fvec,iuser,ruser) ! .. Implicit None Statement .. IMPLICIT NONE ! .. Scalar Arguments .. INTEGER, INTENT (IN) :: m, n ! .. Array Arguments .. REAL (KIND=nag_wp), INTENT (OUT) :: fvec(m) REAL (KIND=nag_wp), INTENT (INOUT) :: ruser(*) REAL (KIND=nag_wp), INTENT (IN) :: xc(n) INTEGER, INTENT (INOUT) :: iuser(*) ! .. Executable Statements .. fvec(1:m) = xc(1) + t(1:m,1)/(xc(2)*t(1:m,2)+xc(3)*t(1:m,3)) - & y(1:m) RETURN END SUBROUTINE lsfun1 END MODULE e04fyfe_mod PROGRAM e04fyfe ! E04FYF Example Main Program ! .. Use Statements .. USE nag_library, ONLY : e04fyf USE e04fyfe_mod, ONLY : lsfun1, lw, m, n, nag_wp, nin, nout, nt, t, y ! .. Implicit None Statement .. IMPLICIT NONE ! .. Local Scalars .. REAL (KIND=nag_wp) :: fsumsq INTEGER :: i, ifail ! .. Local Arrays .. REAL (KIND=nag_wp) :: ruser(1), w(lw), x(n) INTEGER :: iuser(1) ! .. Executable Statements .. WRITE (nout,*) 'E04FYF Example Program Results' ! Skip heading in data file READ (nin,*) ! Observations of TJ (J = 1, 2, ..., nt) are held in T(I, J) ! (I = 1, 2, ..., m) DO i = 1, m READ (nin,*) y(i), t(i,1:nt) END DO x(1:nt) = (/ 0.5_nag_wp, 1.0_nag_wp, 1.5_nag_wp/) ifail = -1 CALL e04fyf(m,n,lsfun1,x,fsumsq,w,lw,iuser,ruser,ifail) SELECT CASE (ifail) CASE (0,2:) WRITE (nout,*) WRITE (nout,99999) 'On exit, the sum of squares is', fsumsq WRITE (nout,99999) 'at the point', x(1:n) END SELECT 99999 FORMAT (1X,A,3F12.4) END PROGRAM e04fyfe