! C05AZF Example Program Text ! Mark 24 Release. NAG Copyright 2012. Module c05azfe_mod ! C05AZF Example Program Module: ! Parameters and User-defined Routines ! .. Use Statements .. Use nag_library, Only: nag_wp ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Real (Kind=nag_wp), Parameter :: tolx = 1.0E-5_nag_wp Integer, Parameter :: ir = 0, nout = 6 Contains Function f(x) ! .. Function Return Value .. Real (Kind=nag_wp) :: f ! .. Scalar Arguments .. Real (Kind=nag_wp), Intent (In) :: x ! .. Intrinsic Procedures .. Intrinsic :: exp ! .. Executable Statements .. f = exp(-x) - x Return End Function f End Module c05azfe_mod Program c05azfe ! C05AZF Example Main Program ! .. Use Statements .. Use nag_library, Only: c05azf, nag_wp Use c05azfe_mod, Only: f, ir, nout, tolx ! .. Implicit None Statement .. Implicit None ! .. Local Scalars .. Real (Kind=nag_wp) :: fx, x, y Integer :: ifail, ind ! .. Local Arrays .. Real (Kind=nag_wp) :: c(17) ! .. Executable Statements .. Write (nout,*) 'C05AZF Example Program Results' Write (nout,*) Write (nout,*) ' Iterations' Write (nout,*) ! Initial values, root in [0,1]. x = 0.0_nag_wp y = 1.0_nag_wp ind = 1 ifail = -1 ! Reverse communication loop revcom: Do Call c05azf(x,y,fx,tolx,ir,c,ind,ifail) If (ind==0) Then Exit revcom End If fx = f(x) Write (nout,99999) ' X =', x, ' FX =', fx, ' IND =', ind End Do revcom ! Results Select Case (ifail) Case (0) Write (nout,*) Write (nout,*) ' Solution' Write (nout,*) Write (nout,99998) ' X =', x, ' Y =', y Case (4,5) Write (nout,99998) 'X =', x, ' Y =', y End Select 99999 Format (1X,A,F8.5,A,E12.4,A,I2) 99998 Format (1X,2(A,F8.5)) End Program c05azfe