6 ! Run-time tests for transformations BESSEL_YN
9 real,parameter :: values(*) = [0.0, 0.5, 1.0, 0.9, 1.8,2.0,3.0,4.0,4.25,8.0,34.53, 475.78]
10 real,parameter :: myeps(size(values)) = epsilon(0.0) &
11 * [2, 2, 2, 5, 5, 2, 12, 2, 4, 3, 30, 130 ]
12 ! The following is sufficient for me - the values above are a bit
14 ! * [0, 0, 0, 3, 3, 0, 9, 0, 2, 1, 22, 130 ]
15 integer,parameter :: nit(size(values)) = &
16 [100, 100, 100, 100, 100, 100, 10, 100, 100, 100, 10, 25 ]
17 integer, parameter :: Nmax = 100
18 real :: rec(0:Nmax), lib(0:Nmax)
21 do i = 1, ubound(values,dim=1)
22 call compare(values(i), myeps(i), nit(i), 3*epsilon(0.0))
27 subroutine compare(X, myeps, nit, myeps2)
32 rec = BESSEL_YN(0, Nmax, X)
33 lib = [ (BESSEL_YN(i, X), i=0,Nmax) ]
35 !print *, 'YN for X = ', X, ' -- Epsilon = ',epsilon(x)
37 ! print '(i2,2e17.9,e12.2,f14.10,2l3)', i, rec(i), lib(i), &
38 ! rec(i)-lib(i), ((rec(i)-lib(i))/rec(i))/epsilon(x), &
39 ! i > nit .or. rec(i) == lib(i) &
40 ! .or. abs((rec(i)-lib(i))/rec(i)) < myeps2, &
41 ! rec(i) == lib(i) .or. abs((rec(i)-lib(i))/rec(i)) < myeps
42 if (.not. (i > nit .or. rec(i) == lib(i) &
43 .or. abs((rec(i)-lib(i))/rec(i)) < myeps2)) &
45 if (.not. (rec(i) == lib(i) .or. abs((rec(i)-lib(i))/rec(i)) < myeps)) &