! D01ANF Example Program Text ! Mark 24 Release. NAG Copyright 2012. Module d01anfe_mod ! D01ANF 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/2 Contains Function g(x) ! .. Function Return Value .. Real (Kind=nag_wp) :: g ! .. Scalar Arguments .. Real (Kind=nag_wp), Intent (In) :: x ! .. Intrinsic Procedures .. Intrinsic :: log ! .. Executable Statements .. If (x>0.0E0_nag_wp) Then g = log(x) Else g = 0.0E0_nag_wp End If Return End Function g End Module d01anfe_mod Program d01anfe ! D01ANF Example Main Program ! .. Use Statements .. Use nag_library, Only: d01anf, nag_wp, x01aaf Use d01anfe_mod, Only: g, liw, lw, nout ! .. Implicit None Statement .. Implicit None ! .. Local Scalars .. Real (Kind=nag_wp) :: a, abserr, b, epsabs, epsrel, & omega, pi, result Integer :: ifail, key ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: w(:) Integer, Allocatable :: iw(:) ! .. Executable Statements .. Write (nout,*) 'D01ANF Example Program Results' Allocate (w(lw),iw(liw)) epsrel = 1.0E-04_nag_wp epsabs = 0.0E+00_nag_wp a = 0.0E0_nag_wp b = 1.0E0_nag_wp omega = 10.0E0_nag_wp*x01aaf(pi) key = 2 ifail = -1 Call d01anf(g,a,b,omega,key,epsabs,epsrel,result,abserr,w,lw,iw,liw, & ifail) If (ifail>=0) Then Write (nout,*) Write (nout,99999) 'A ', 'lower limit of integration', a Write (nout,99999) 'B ', 'upper limit of integration', b 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) End Program d01anfe