Program d01gafe ! D01GAF Example Program Text ! Mark 24 Release. NAG Copyright 2012. ! .. Use Statements .. Use nag_library, Only: d01gaf, nag_wp ! .. Implicit None Statement .. Implicit None ! .. Parameters .. Integer, Parameter :: nin = 5, nout = 6 ! .. Local Scalars .. Real (Kind=nag_wp) :: ans, er Integer :: i, ifail, n ! .. Local Arrays .. Real (Kind=nag_wp), Allocatable :: x(:), y(:) ! .. Executable Statements .. Write (nout,*) 'D01GAF Example Program Results' ! Skip heading in data file Read (nin,*) Read (nin,*) n Allocate (x(n),y(n)) Read (nin,*)(x(i),y(i),i=1,n) ifail = -1 Call d01gaf(x,y,n,ans,er,ifail) Select Case (ifail) Case (0) Write (nout,*) Write (nout,99999) 'Integral = ', ans, ' Estimated error = ', er Case (1) Write (nout,*) Write (nout,*) 'Less than 4 points supplied' Case (2) Write (nout,*) Write (nout,*) 'Points not in increasing or decreasing order' Case (3) Write (nout,*) Write (nout,*) 'Points not all distinct' End Select 99999 Format (1X,A,F7.4,A,F7.4) End Program d01gafe