! C05AUF Example Program Text ! Mark 24 Release. NAG Copyright 2012. Module c05aufe_mod ! C05AUF Example Program Module: ! Parameters and User-defined Routines ! .. Use Statements .. Use nag_library, Only: nag_wp ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nout = 6 Contains Function f(x,iuser,ruser) ! .. Function Return Value .. Real (Kind=nag_wp) :: f ! .. Scalar Arguments .. Real (Kind=nag_wp), Intent (In) :: x ! .. Array Arguments .. Real (Kind=nag_wp), Intent (Inout) :: ruser(*) Integer, Intent (Inout) :: iuser(*) ! .. Intrinsic Procedures .. Intrinsic :: exp ! .. Executable Statements .. f = x - exp(-x) Return End Function f End Module c05aufe_mod Program c05aufe ! C05AUF Example Main Program ! .. Use Statements .. Use nag_library, Only: c05auf, nag_wp Use c05aufe_mod, Only: f, nout ! .. Implicit None Statement .. Implicit None ! .. Local Scalars .. Real (Kind=nag_wp) :: a, b, eps, eta, h, x Integer :: ifail ! .. Local Arrays .. Real (Kind=nag_wp) :: ruser(1) Integer :: iuser(1) ! .. Executable Statements .. Write (nout,*) 'C05AUF Example Program Results' x = 1.0E0_nag_wp h = 0.1E0_nag_wp eps = 1.0E-5_nag_wp eta = 0.0E0_nag_wp ifail = -1 Call c05auf(x,h,eps,eta,f,a,b,iuser,ruser,ifail) Write (nout,*) Select Case (ifail) Case (0) Write (nout,99999) 'Root is ', x Write (nout,99998) 'Interval searched is [', a, ',', b, ']' Case (3,4) Write (nout,99999) 'Final value = ', x End Select 99999 Format (1X,A,F13.5) 99998 Format (1X,A,2(F8.5,A)) End Program c05aufe