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! { dg-add-options ieee }
!
! PR fortran/36158
! PR fortran/33197
!
! Run-time tests for transformations BESSEL_JN
!
implicit none
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]
real,parameter :: myeps(size(values)) = epsilon(0.0) &
* [2, 7, 5, 6, 9, 12, 12, 7, 7, 8, 98, 15 ]
! The following is sufficient for me - the values above are a bit
! more tolerant
! * [0, 5, 3, 4, 6, 7, 7, 5, 5, 6, 66, 4 ]
integer,parameter :: mymax(size(values)) = &
[100, 17, 23, 21, 27, 28, 32, 35, 31, 41, 47, 37 ]
integer, parameter :: Nmax = 100
real :: rec(0:Nmax), lib(0:Nmax)
integer :: i
do i = 1, ubound(values,dim=1)
call compare(mymax(i), values(i), myeps(i))
end do
contains
subroutine compare(mymax, X, myeps)
integer :: i, nit, mymax
real X, myeps, myeps2
rec(0:mymax) = BESSEL_JN(0, mymax, X)
lib(0:mymax) = [ (BESSEL_JN(i, X), i=0,mymax) ]
!print *, 'YN for X = ', X, ' -- Epsilon = ',epsilon(x)
do i = 0, mymax
! print '(i2,2e17.9,e12.2,f18.10,2l3)', i, rec(i), lib(i), &
! rec(i)-lib(i), ((rec(i)-lib(i))/rec(i))/epsilon(x), &
! rec(i) == lib(i), abs((rec(i)-lib(i))/rec(i)) < myeps
if (rec(i) == lib(i)) CYCLE
if (abs((rec(i)-lib(i))/rec(i)) > myeps) &
STOP 1
end do
end
end
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