! D01AMF Example Program Text ! Mark 24 Release. NAG Copyright 2012. Module d01amfe_mod ! D01AMF Example Program Module: ! Parameters and User-defined Routines ! .. Use Statements .. Use nag_library, Only: nag_wp ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: lw = 800, nout = 6 Integer, Parameter :: liw = lw/4 Contains Function f(x) ! .. Function Return Value .. Real (Kind=nag_wp) :: f ! .. Scalar Arguments .. Real (Kind=nag_wp), Intent (In) :: x ! .. Intrinsic Procedures .. Intrinsic :: sqrt ! .. Executable Statements .. f = 1.0E0_nag_wp/((x+1.0E0_nag_wp)*sqrt(x)) Return End Function f End Module d01amfe_mod Program d01amfe ! D01AMF Example Main Program ! .. Use Statements .. Use nag_library, Only: d01amf, nag_wp Use d01amfe_mod, Only: f, liw, lw, nout ! .. Implicit None Statement .. Implicit None ! .. Local Scalars .. Real (Kind=nag_wp) :: abserr, bound, epsabs, epsrel, & result Integer :: ifail, inf ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: w(:) Integer, Allocatable :: iw(:) ! .. Executable Statements .. Write (nout,*) 'D01AMF Example Program Results' Allocate (w(lw),iw(liw)) epsabs = 0.0E0_nag_wp epsrel = 1.0E-04_nag_wp bound = 0.0E0_nag_wp inf = 1 ifail = -1 Call d01amf(f,bound,inf,epsabs,epsrel,result,abserr,w,lw,iw,liw,ifail) If (ifail>=0) Then Write (nout,*) Write (nout,99999) 'A ', 'lower limit of integration', bound Write (nout,99995) 'B ', 'upper limit of integration', 'infinity' Write (nout,99998) 'EPSABS', 'absolute accuracy requested', epsabs Write (nout,99998) 'EPSREL', 'relative accuracy requested', epsrel End If If (ifail>=0 .And. ifail<=5) Then Write (nout,*) Write (nout,99997) 'RESULT', 'approximation to the integral', result Write (nout,99998) 'ABSERR', 'estimate of the absolute error', abserr Write (nout,99996) 'IW(1) ', 'number of subintervals used', iw(1) End If 99999 Format (1X,A6,' - ',A32,' = ',F10.4) 99998 Format (1X,A6,' - ',A32,' = ',E9.2) 99997 Format (1X,A6,' - ',A32,' = ',F9.5) 99996 Format (1X,A6,' - ',A32,' = ',I4) 99995 Format (1X,A6,' - ',A32,' = ',A8) End Program d01amfe