test.f90 23.1 KB
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! These tests assume that GPLInfinity = 30
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PROGRAM TEST
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  use globals
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  use utils
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  use shuffle
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  use maths_functions
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  use mpl_module
  use gpl_module
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  use chenreftest, only: do_chen_test
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  implicit none
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  real(kind=prec) :: tol = 8.0e-7
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  logical :: tests_successful = .true. 
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#ifdef DEBUG
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  call parse_cmd_args()
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#endif
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  tol = zero * 1.e5_prec
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  call do_MPL_tests() 
  call do_GPL_tests()
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  ! call do_shuffle_tests() ! put this somewhere else
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  tol = 8.0e-7
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  tests_successful = tests_successful .and. do_chen_test()
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#ifdef HAVE_GINAC
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#ifdef HAVE_MM
  call do_ginac_tests
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#ifndef NOSPEED
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  call do_timing_tests(5)
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  call do_high_weight_tests
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#endif
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#endif
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#endif
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  if(tests_successful) then
    print*, 'All tests passed. '
  else 
    print*, 'Some tests failed. '
    stop 1
  end if
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CONTAINS
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  subroutine check(res, ref)
    complex(kind=prec) :: res, ref
    real(kind=prec) :: delta

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    delta = abs(res-ref)
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    if(delta < tol) then
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      print*, '       ',' passed with delta = ', delta
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    else 
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      print*, '  ',' FAILED with delta = ', delta
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      tests_successful = .false.
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    end if
  end subroutine check
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  subroutine test_one_MPL(m,x,ref, test_id)
    integer :: m(:)
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    complex(kind=prec) :: x(:), ref, res
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    character(len=*) :: test_id
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    print*, '  ', 'testing MPL ', test_id, ' ...'
    res = MPL(m,x)
    call check(res,ref)
  end subroutine test_one_MPL

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  subroutine do_MPL_tests()
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    complex(kind=prec) :: ref
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    print*, 'doing MPL tests...'
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    ref = (0.0226974036143118403367048874190211851348_prec,0.)
    call test_one_MPL((/ 1,1 /),cmplx([ 119._prec/377._prec,  35._prec / 102._prec ],kind=prec),ref, '1.1')

    ref = (2.31346156303083313941538625891818239608127E-4_prec,0.)
    call test_one_MPL((/ 1,1 /),cmplx([0.03_prec, 100._prec-30._prec*sqrt(11._prec) ], kind=prec),ref, '1.2')
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    ref = (2.34617486908178608355021488772249510275409004880846912378356e-5_prec,0.)
    call test_one_MPL((/ 2,1,2 /),cmplx([0.03_prec, 100._prec-30._prec*sqrt(11._prec), 250._prec/9._prec + sqrt(6875._prec)/3._prec ], kind=prec),ref, '1.3')
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    ref = (-0.06565799418838388900030511939327151809905663800733251335678_prec,0.)
    call test_one_MPL((/1, 1/), (/(-0.25_prec,0.),(-2._prec,0.) /), ref, '1.4')
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    ref = (-0.0319989639656484125354488353677231989818697987217232462808_prec,0.)
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    call test_one_MPL((/2, 1/), (/(-0.25_prec,0.),(-2._prec,0.) /), ref, '1.5')
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  end subroutine do_MPL_tests
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  subroutine test_one_condensed(m,z,y,k,ref,test_id)
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    integer :: m(:), k
    complex(kind=prec) :: z(:), y, res, ref
    character(len=*) :: test_id
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    print*, '  ', 'testing GPL ', test_id, ' ...'
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    res = G_condensed(m,toinum(z),inum(y,di0),k)
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    call check(res,ref)
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  end subroutine test_one_condensed

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  subroutine test_one_flat(z,ref,test_id)
    complex(kind=prec) :: z(:), res, ref
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    character(len=*) :: test_id

    print*, '  ', 'testing GPL ', test_id, ' ...'
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    res = G(z)
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    call check(res,ref)
  end subroutine test_one_flat
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  subroutine do_GPL_tests()
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    complex(kind=prec) :: ref, res
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    real(kind=prec) :: z, xchen
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    print*, 'doing GPL tests...'
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    ref = (0.0819393734128676670196050250748145117414_prec,0.)
    call test_one_condensed((/ 1,1 /),(/ (1.3_prec,0.), (1.1_prec,0.) /),(0.4_prec,0.),2,ref,'2.1')
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    ref = (0.0159279595253714815409530431586662402173_prec,0.)
    call test_one_condensed((/ 3,2 /),(/ (1.3_prec,0.), (1.1_prec,0.) /),(0.4_prec,0.),2,ref,'2.2')

    ref = (0.0020332632172573960663410568998748341439_prec,0.)
    call test_one_condensed((/ 4 /),(/ (0._prec,0.) /),(1.6_prec,0.),1,ref,'2.3')
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    ! requires making convergent
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    ref = (0.0959304167763934268889451723647597269243_prec,-0.882935179519785044294098901083860819793_prec)
    call test_one_flat(cmplx([0,1,3,2],kind=prec),ref,'2.4')
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    ref = (0.00994794778992862285848386211876302459484_prec,0.0)
    call test_one_flat([ (0._prec,0.), (0._prec,0.), cmplx(-10._prec/3._prec,kind=prec), cmplx(-10._prec/3._prec,kind=prec), (1._prec,0.) ],ref,'2.5')
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    ! requires hoelder convolution
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    ref = (-0.01270994282825128082040127705282437854604_prec,0.0)
    call test_one_flat([ (0._prec,0.), cmplx(10._prec/3._prec,kind=prec), (1._prec,0.), cmplx(10._prec/3._prec,kind=prec), (1._prec,0.) ],ref,'2.6')
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    ! here the tests from the mathematica nb start
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    ! --------------------------------------------------------------------------

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    z = 1._prec/200; xchen = 0.3_prec;
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    ref = (-0.00501254182354428204309373895836778138658_prec,0.0)
    call test_one_flat(cmplx([1./z,1.0_prec],kind=prec),ref,'3.1')
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    ref = (-0.001501126126267145650881556104825717433567_prec,0.0)
    call test_one_flat(cmplx([1./(xchen*z),1.0_prec],kind=prec),ref,'3.2')
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    ref = (-7.50286081781062398521044689345496255877E-4_prec,0.0)
    call test_one_flat(cmplx([(1+sqrt(1-z**2))/(xchen*z),1.0_prec],kind=prec),ref,'3.3')
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    ref = (0.0074335969894769006767497160582533005912_prec,0.0)
    call test_one_flat(cmplx([-1._prec/xchen,-1._prec/xchen,1._prec,1._prec,1._prec],kind=prec),ref,'3.4')
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    ref = (-8.40378597494480117619893114520705717404E-6_prec,0.0)
    call test_one_flat(cmplx([-1._prec/xchen,0._prec,-1._prec/xchen,1._prec/(xchen*z),1.0_prec],kind=prec),ref,'3.5')
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    ref = (0.492575584745015188956099120118429131062_prec,2.63892140547433046711653044177665570864_prec)
    call test_one_flat(cmplx([-1._prec,-1._prec,z,z,1._prec],kind=prec),ref,'3.6')
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    ref = (-0.001531771317885848316868878120481266022195_prec,-4.50039113668843745227527662921010599E-4_prec)
    call test_one_flat(cmplx([0._prec,0._prec,(1._prec-sqrt(1-z**2))/(xchen*z), 1._prec/(xchen*z),1._prec],kind=prec),ref,'3.7')
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    ! here the chen integral tests start
    ! ----------------------------------------------------------------------

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    z = 1/100._prec
    ref = (-1.203972804325935992622746217761838502954_prec,0.0)
    call test_one_flat((/ (0._prec,0.), (0.3_prec,0.) /),ref,'4.1')
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    ref = (10.6037962209567960211233327771880353832_prec,0.0)
    call test_one_flat( (/ (0._prec,0.), (0._prec,0.), (0.01_prec,0.) /),ref,'4.2')
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    ref = (5.0429900651807654463744449762857296353E-4_prec,0.0)
    call test_one_flat((/(100._prec,0.), (1._prec,0.), (0.3_prec,0.) /),ref,'4.3')
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    ref = (0.05630861877185110944118569266547272128_prec,0.0)
    call test_one_flat( (/ (1._prec,0.), (0._prec,0.), (0.01_prec,0.) /) ,ref,'4.4')
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    ref = (0.0403289515087272334386799760345612761274_prec,0.29227096475688417627233177065883250904_prec)
    call test_one_flat([cmplx(z,sqrt(1._prec-z**2),kind=prec), (0.3_prec,0._prec)],ref,'4.5')
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    ref = (2.52106450983403521007132254962389653479E-5_prec,0.)
    call test_one_flat(cmplx([1._prec/z,  (1+sqrt(1-z**2))/z, 1._prec], kind=prec),ref,'4.6')
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    ref = (0.0556470547634805907802456701296765199105_prec,0.)
    call test_one_flat((/ (-1._prec,0.), (0.01_prec,0.), (0._prec,0.), (0.01_prec,0.) /),ref,'4.7')
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    ref = (3.79489584700899518570534417045601144619E-5_prec,0.)
    call test_one_flat((/ (100._prec,0.), (100._prec,0.), (1._prec,0.), (0._prec,0.), (1._prec,0.) /),ref,'4.8')
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    ref = (7.57428443370789293292663421167820669347E-5_prec,0.)
    call test_one_flat((/ (100._prec,0.), (1._prec,0.), (100._prec,0.), (0._prec,0.), (1._prec,0.) /),ref,'4.9')
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    ref = (1.88019115860102242751826218248903485831_prec,2.50943413859806280406885100241705929527_prec)
    call test_one_flat((/ (0.01_prec,0.), (-1.0_prec,0.), (0.01_prec,0.), (1._prec,0.) /),ref,'4.10')
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    ref = (-0.0125391083150538283259376060156453327489_prec,-0.0154142501684376766660782277248386124052_prec)
    call test_one_flat(cmplx([z, (1+sqrt(1-z**2))/z, z, 1._prec],kind=prec),ref,'4.11')
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    ! Increase test coverage
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    ref = (-1.203972804325935992622746217761838502953611_prec, pi)
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    call test_one_flat((/ (0._prec,0.), (-0.3_prec,0.) /),ref,'E.1')
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    ref = (-0.539404830685964989184608085018712655769250_prec, 1.0303768265243124637877433270311515319634364_prec)
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    call test_one_flat([(0._prec,0._prec), (0.3_prec, 0.5_prec)],ref,'E.2')
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    ref = (3.79489584700899518570534417045601144619E-5_prec,0.)
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    print*, '  ', 'testing GPL ', 'E.3', ' ...'
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    res = G((/100._prec, 100._prec, 1._prec, 0._prec, 1._prec/))
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    call check(res,ref)

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    print*, '  ', 'testing GPL ', 'E.4', ' ...'
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    res = G((/100,100,1,0,1/))
    call check(res,ref)

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    print*, '  ', 'testing GPL ', 'E.5', ' ...'
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    res = G_superflatn(toinum((/100,100,1,0,1/)), 5)
    call check(res,ref)

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    print*, '  ', 'testing GPL ', 'E.6', ' ...'
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    res = G((/100._prec,100._prec,1._prec,0._prec/), 1._prec)
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    call check(res,ref)

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    print*, '  ', 'testing GPL ', 'E.7', ' ...'
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    res = G((/(100._prec,0.),(100._prec,0.),(1._prec,0.),(0._prec,0.)/), (1._prec,0.))
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    call check(res,ref)

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    print*, '  ', 'testing GPL ', 'E.8', ' ...'
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    res = G( (/1,1,1,1/) , (/ 100._prec, 100._prec, 1._prec, 0._prec /), 1._prec)
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    call check(res,ref)

    !ref = cmplx(0.01592795952537145)
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    ref = (0.0485035531168477720320998551314479928648_prec,-2.82326885118931135859594797186107474877_prec)
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    print*, '  ', 'testing GPL ', 'E.9', ' ...'
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    res = G( (/ 3, 2 /), toinum((/ 1.3_prec, 1.1_prec /)), toinum(4._prec) )
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    call check(res,ref)

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    print*, '  ', 'testing GPL ', 'E.10', ' ...'
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    res = G( (/ 3, 2 /), (/ 1.3_prec, 1.1_prec /), 4._prec )
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    call check(res,ref)

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    print*, '  ', 'testing GPL ', 'E.11', ' ...'
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    res = G( (/ 3, 2 /), (/ (1.3_prec,0.), (1.1_prec,0.) /), (4._prec,0.) )
    call check(res,ref)

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    print*, '  ', 'testing GPL ', 'E.12', ' ...'
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    ref = (0.107961231635965271810236308594279564021882373573100109007684973130605145011141_prec, 0.)
    res = G((/ 0._prec, 1.3_prec, 0._prec, 0._prec, 4._prec, 1.1_prec /))
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    call check(res,ref)

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    print*, '  ', 'testing GPL ', 'E.13', ' ...'
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    ref = (-1.229846637025798984989235266565630713100_prec,-1.05705870670612913651142424798975000765_prec)
    res = G([inum(2._prec, +1), inum(7._prec, +1)], inum(5._prec, +1))
    call check(res,ref)

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    print*, '  ', 'testing GPL ', 'E.14', ' ...'
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    ref = (-1.229846637025798984989235266565630713100_prec,+1.05705870670612913651142424798975000765_prec)
    res = G([inum(2._prec, -1), inum(7._prec, +1)], inum(5._prec, +1))
    call check(res,ref)

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    print*, '  ', 'testing GPL ', 'E.15', ' ...'
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    ref = (0.2982254208688088675254638762780704094718_prec,0.)
    res = G([inum(2._prec, -1), inum(7._prec, +1)], inum(-5._prec, -1))
    call check(res,ref)

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    print*, '  ', 'testing GPL ', 'E.17', ' ...'
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    ref = (0.190800137777535619036913153766083992418_prec, 0.)
    res = G((/ 6, 1, 1 /))
    call check(res,ref)

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    print*, '  ', 'testing GPL ', 'E.18', ' ...'
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    ref = (0.058192342415778512650117048874978455691_prec, 0.)
    res = G((/ 6, 1, -1 /))
    call check(res,ref)

    ref = cmplx(log(0.5_prec), pi,kind=prec)
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    print*, '  ', 'testing GPL ', 'E.19a', ' ...'
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    res = G((/ inum(2._prec, +1) /), inum(3._prec, +1))
    call check(res,ref)
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    print*, '  ', 'testing GPL ', 'E.19b', ' ...'
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    res = G((/ inum(2._prec, -1) /), inum(3._prec, +1))
    call check(res,conjg(ref))
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    print*, '  ', 'testing GPL ', 'E.19c', ' ...'
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    res = G((/ inum(2._prec, +1) /), inum(3._prec, -1))
    call check(res,ref)
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    print*, '  ', 'testing GPL ', 'E.19d', ' ...'
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    res = G((/ inum(2._prec, -1) /), inum(3._prec, -1))
    call check(res,conjg(ref))

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    print*, '  ', 'testing GPL ', 'E.19e', ' ...'
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    res = G((/ inum(-2._prec, +1) /), inum(-3._prec, +1))
    call check(res,conjg(ref))
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    print*, '  ', 'testing GPL ', 'E.19f', ' ...'
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    res = G((/ inum(-2._prec, -1) /), inum(-3._prec, +1))
    call check(res,ref)
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    print*, '  ', 'testing GPL ', 'E.19g', ' ...'
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    res = G((/ inum(-2._prec, +1) /), inum(-3._prec, -1))
    call check(res,conjg(ref))
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    print*, '  ', 'testing GPL ', 'E.19h', ' ...'
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    res = G((/ inum(-2._prec, -1) /), inum(-3._prec, -1))
    call check(res,ref)
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    ref = -(2.374395270272480200677499763071638424_prec, - 1.273806204919600530933131685580471698_prec)
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    print*, '  ', 'testing GPL ', 'E.20a', ' ...'
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    res = G((/ izero, inum(2._prec, +1) /), inum(3._prec, +1))
    call check(res,ref)
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    print*, '  ', 'testing GPL ', 'E.20b', ' ...'
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    res = G((/ izero, inum(2._prec, -1) /), inum(3._prec, +1))
    call check(res,conjg(ref))
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    print*, '  ', 'testing GPL ', 'E.20c', ' ...'
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    res = G((/ izero, inum(2._prec, +1) /), inum(3._prec, -1))
    call check(res,ref)
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    print*, '  ', 'testing GPL ', 'E.20d', ' ...'
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    res = G((/ izero, inum(2._prec, -1) /), inum(3._prec, -1))
    call check(res,conjg(ref))

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    print*, '  ', 'testing GPL ', 'E.20e', ' ...'
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    res = G((/ izero, inum(-2._prec, +1) /), inum(-3._prec, +1))
    call check(res,conjg(ref))
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    print*, '  ', 'testing GPL ', 'E.20f', ' ...'
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    res = G((/ izero, inum(-2._prec, -1) /), inum(-3._prec, +1))
    call check(res,ref)
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    print*, '  ', 'testing GPL ', 'E.20g', ' ...'
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    res = G((/ izero, inum(-2._prec, +1) /), inum(-3._prec, -1))
    call check(res,conjg(ref))
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    print*, '  ', 'testing GPL ', 'E.20h', ' ...'
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    res = G((/ izero, inum(-2._prec, -1) /), inum(-3._prec, -1))
    call check(res,ref)
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    ! Thanks to Roman Zwicky and Ben Pullin for these tests
    ref = (0.392707112217551702879328061598355445_prec, - 1.274969448494380061814943180491890080_prec)
    print*, '  ', 'testing GPL ', 'F.1', ' ...'
    res = G( (/ (0._prec,0.), (1._prec,0.), (0._prec, 1.5_prec) /) )
    call check(res,ref)

    ref = (2.09624324167194065961839363660174566_prec, 0.62644605179087454819421905065313983_prec)
    print*, '  ', 'testing GPL ', 'F.2', ' ...'
    res = G( (/ (1._prec,0.), (-1._prec,0.), (2.5_prec, -2.4_prec) /) )
    call check(res,ref)

    ref = conjg(ref)
    print*, '  ', 'testing GPL ', 'F.3', ' ...'
    res = G( (/ (1._prec,0.), (-1._prec,0.), (2.5_prec, +2.4_prec) /) )
    call check(res,ref)

    ref = (0.6874619495289224183167486785286777066_prec, -1.8261934916106546308783576818077830287_prec)
    print*, '  ', 'testing GPL ', 'F.4', ' ...'
    res = G( (/ (-1._prec,0.), (1._prec,0.), (2.5_prec, +2.4_prec) /) )
    call check(res,ref)

    ref = (0.320016770069038023050391296154549_prec , 0.064263450879286017225353602844105_prec)
    print*, '  ', 'testing GPL ', 'F.5', ' ...'
    res = G( (/ (0._prec,0.), (1._prec,0.), (-1._prec,0.), (0.3_prec, -1.2_prec) /) )
    call check(res,ref)

    ref = conjg(ref)
    print*, '  ', 'testing GPL ', 'F.6', ' ...'
    res = G( (/ (0._prec,0.), (1._prec,0.), (-1._prec,0.), (0.3_prec, +1.2_prec) /) )
    call check(res,ref)

    ref = (0.8382358254435272068734922352_prec, - 0.3702062785327198487992149341_prec)
    print*, '  ', 'testing GPL ', 'F.7', ' ...'
    res = G( (/ (0._prec,0.), (1._prec,0.), (-1._prec,0.), (1.1_prec,2._prec) /) )
    call check(res,ref)

    ref = (0.185156872427485220072774923047908301422_prec,-0.249989197161429773744237773045427322847_prec)
    print*, '  ', 'testing GPL ', 'F.8', ' ...'
    res = G( (/ (1._prec,0.), (-1._prec,0.), (2.3_prec,-1._prec), (1.1_prec,-0.1_prec) /) )
    call check(res,ref)

    ref = (-1.11161035333074623447215317094270858897_prec,-0.875225967273157437459269290416981432294_prec)
    print*, '  ', 'testing GPL ', 'F.9', ' ...'
    res = G( (/ (1._prec,0.), (1.1_prec,-0.1_prec), (1._prec,0.), (2.3_prec,-1.2_prec), (3.4_prec,9.7_prec) /) )
    call check(res,ref)


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  end subroutine do_GPL_tests
  
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#ifdef HAVE_GINAC
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#ifdef HAVE_MM
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  function evalt(arr, what)
    implicit none
    complex(kind=prec) :: arr(:), evalt, geval
    integer what, i, l

    evalt =0.

    do i=1,size(arr)
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      if (abs(arr(i)) .gt. 1.e10) then ! isnan?
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        l = i-1
        goto 123
      endif
    enddo
    l = size(arr)

123 continue
    if (l==0) return

    if (what .eq. 0) then
      evalt = G(arr(1:l))
    elseif (what.eq.1) then
      evalt = geval(arr(1:l),l)
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    endif
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  end function

  subroutine perform_ginacv(n, args)
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    use maths_functions, only:clearcache
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    complex(kind=prec) :: args(:,:)
    integer i,n
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    call clearcache
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    do i=1,size(args,1)
      write(*,900) n,i
      call check(evalt(args(i,:),0),evalt(args(i,:),1))
    enddo

900 format("   testing GPL ",I1,".",I4.4," ...")

  end subroutine

  subroutine do_ginac_tests
    use maths_functions, only:clearcache
    use gtestchen   , only: inichen   =>args
    use gtestmuone  , only: inimuone  =>args
    use gtestmuonenp, only: inimuonenp=>args
    implicit none
    tol = 6.0e-6
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    call perform_ginacv( 6, inichen   ((0.3_prec,0.), (0.1_prec,0.)) )
    call perform_ginacv( 7, inimuone  ((0.5_prec,0.), (0.6_prec,0.)) )
    call perform_ginacv( 8, inimuonenp((0.3_prec,0.), (0.6_prec,0.)) )
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  end subroutine
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#ifndef NOSPEED
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  subroutine do_one_speed_test(args, u, msg)
    use maths_functions, only:clearcache
    implicit none
    complex(kind=prec) :: args(:,:,:),res
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    integer(kind=8) cstart, cend, count_rate
    real(kind=prec) :: time(2), ttime(2)
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    integer i,j, u
    character,parameter :: cr = achar(13)
    character(len=*) msg
    do j=1,size(args,1)
      ! try function a bunch of times
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      call system_clock(cstart, count_rate=count_rate)
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      do i=1,size(args,3)
        res=evalt(args(j,:,i),0)
      enddo
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      call system_clock(cend, count_rate=count_rate)
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      time(1) = real(cend-cstart)/real(count_rate,kind=prec)/size(args,3)
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      if (time(1).lt.zero) print*,j, cend-cstart,count_rate
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      ttime(1) = ttime(1) + time(1)

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      call system_clock(cstart, count_rate=count_rate)
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      do i=1,size(args,3)
        res=evalt(args(j,:,i),1)
      enddo
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      call system_clock(cend, count_rate=count_rate)
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      time(2) = real(cend-cstart)/real(count_rate,kind=prec)/size(args,3)
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      if (time(2).lt.zero) print*,j
      ttime(2) = ttime(2) + time(2)

      write(u,*) time

      write( * , 900, advance='no' ) cr, j, size(args,1), msg
    enddo
    print*,
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    print*,ttime
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    write(*,901) msg, size(args,1)/ttime(2)/1000., size(args,1)/ttime(1)/1000., int(ttime(2)/ttime(1))

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    ! Lets to another, fair comparison
    call system_clock(cstart, count_rate=count_rate)
    do j=1,size(args,1)
      res=evalt(args(j,:,1),0)
    enddo
    call system_clock(cend, count_rate=count_rate)
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    ttime(1) = real(cend-cstart)/real(count_rate,kind=prec)
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    call system_clock(cstart, count_rate=count_rate)
    do j=1,size(args,1)
      res=evalt(args(j,:,1),1)
    enddo
    call system_clock(cend, count_rate=count_rate)
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    ttime(2) = real(cend-cstart)/real(count_rate,kind=prec)
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    write(*,901) msg, size(args,1)/ttime(2)/1000., size(args,1)/ttime(1)/1000., int(ttime(2)/ttime(1))

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900 FORMAT(a , 'Function ',i4,'/',i4,' for ',a)
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901 format('Evaluating ',A,' using GiNaC at ',F9.2,'kG/s and handyG at ',F9.2,'kG/s (',I3,'x)')
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  end subroutine

  subroutine do_timing_tests(n)
    use gtestchen   , only: inichen   =>args
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    use gtestchenff , only: inichenff =>args
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    use gtestmuone  , only: inimuone  =>args
    use gtestmuonenp, only: inimuonenp=>args
    implicit none
    integer, intent(in) :: n
    integer i
    complex(kind=prec) :: cargs( 1399,5,n)
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    complex(kind=prec) :: fargs(  540,5,n)
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    complex(kind=prec) :: pargs(  198,5,n)
    complex(kind=prec) :: nargs( 1733,5,n)
    real(kind=prec) :: z, x, y, w
    integer ranseed
    ranseed = 233123

    do i=1,n
      z = ran2(ranseed) / 2.
      x = ran2(ranseed)*(1-z) + z
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      cargs(:,:,i) = inichen  (cmplx(x,kind=prec), cmplx(z,kind=prec))
      fargs(:,:,i) = inichenff(cmplx(x,kind=prec), cmplx(z,kind=prec))
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      w = ran2(ranseed) ! 0<w<1
      z = ran2(ranseed) * (sqrt(1-w+w**2)-sqrt(w)) + sqrt(w)
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      nargs(:,:,i) = inimuonenp(cmplx(w,kind=prec), cmplx(z,kind=prec))
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      x = ran2(ranseed)
      y = ran2(ranseed)
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      pargs(:,:,i) = inimuone(cmplx(x,kind=prec), cmplx(y,kind=prec))
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    enddo

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    cargs(1181,:,:)=1.e15
    fargs(367,:,:)=1.e15
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    open(unit=9, file="stats.txt")
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    write(9,*) "Chen form factor"
    call do_one_speed_test(fargs,9,"Chen FF")
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    write(9,*) "Chen"
    call do_one_speed_test(cargs,9,"Chen")
    write(9,*) "MUonE-planar"
    call do_one_speed_test(pargs,9,"Muone planar")
    write(9,*) "MUonE-non-planar"
    call do_one_speed_test(nargs,9,"Muone non planar")
    close(unit=9)

  end subroutine
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  subroutine fyshuffle(list, seed)
    real(kind=prec) :: list(:), tmp
    integer j,i, seed

    do i=size(list),2,-1
      j = int(ran2(seed) * i) + 1
      tmp = list(j)
      list(j) = list(i)
      list(i) = tmp
    enddo
  end subroutine

  function test_one_high_weight(length, fzero, funiq, alphabet, seed, what) result(res)
    integer length,seed, i, what
    integer nzero, nuniq, nsmall, c
    real(kind=prec) :: fzero, funiq, fsmall
    real(kind=prec) :: arguments(length), alphabet(10)
    complex(kind=prec) :: Geval, res
    nzero  = nint(fzero*length)
    nuniq  = nint(       funiq*length)
    nsmall = nint(fsmall*funiq*length)

    if (nzero+nuniq > length) nuniq = length - nzero

    !do i=1,nsmall
    !  alphabet(i) = 0.8_prec * ran2(seed)
    !enddo
    !do i=nsmall+1,nuniq
    !  alphabet(i) = 1.5_prec/(0.15_prec + ran2(seed))
    !enddo

    arguments(1:nzero) = 0._prec
    do i=1,nuniq
      arguments(nzero+i) = alphabet(i)
    enddo
    do i=nzero+nuniq,length
      c = int(ran2(seed)*nuniq)+1
      arguments(i) = alphabet(c)
    enddo

    call fyshuffle(arguments, seed)
    do while(arguments(length)<zero)
      call fyshuffle(arguments, seed)
    enddo
    write(9,*)"args",arguments
    if (what.eq.1) then
      res = G(arguments, 1._prec)
    elseif (what.eq.2) then
      res = Geval(cmplx([arguments, 1._prec],kind=prec),length+1)
    endif
  end function


  subroutine do_high_weight_tests
    integer, parameter :: ntests=10
    real(kind=prec), parameter :: fzero = 0.28
    real(kind=prec), parameter :: funiq = 0.63
    real(kind=prec), parameter :: fsmal = 0.42
    integer(kind=8) cstart, cend, count_rate
    complex(kind=prec) :: res(ntests,2)
    real(kind=prec) :: alphabet(10)

    integer i,j
    integer seed, seedold
    seed = 123123

    open(unit=9, file="stats-hi.txt")
    alphabet = (/ 0.3, 0.6, 1.8, 5.3, 3.6, 8.3, 0.1, 0.4, 0.2, 10.2 /)
    do i=2,7
      seedold=seed
      do j=1,ntests
        call system_clock(cstart, count_rate=count_rate)
        res(j,1) = test_one_high_weight(i, fzero, funiq, alphabet, seed,1)
        call system_clock(cend, count_rate=count_rate)
        write(9,*) "time",i,j,real(cend-cstart)/real(count_rate,kind=prec)!/ntests
      enddo

      seed=seedold
      do j=1,ntests
        call system_clock(cstart, count_rate=count_rate)
        res(j,2) = test_one_high_weight(i, fzero, funiq, alphabet, seed,2)
        call system_clock(cend, count_rate=count_rate)
        write(9,*)"ginac",i,j,real(cend-cstart)/real(count_rate,kind=prec)!/ntests
      enddo

      write(9,*)"del",abs(res(:,1)-res(:,2)) / tol
      write(9,*)
      write(9,*)
    enddo
    close(unit=9)
  end subroutine

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#endif
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      FUNCTION RAN2(randy)

            ! This is the usual "random"

      implicit none
      real(kind=prec) :: MINV,RAN2
      integer m,a,Qran,r,hi,lo,randy
      PARAMETER(M=2147483647,A=16807,Qran=127773,R=2836)
      PARAMETER(MINV=0.46566128752458e-09)
      HI = RANDY/Qran
      LO = MOD(RANDY,Qran)
      RANDY = A*LO - R*HI
      IF(RANDY.LE.0) RANDY = RANDY + M
      RAN2 = RANDY*MINV
      END FUNCTION RAN2



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#endif
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#endif
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  ! subroutine do_shuffle_tests() 
  !   complex(kind=prec) :: v(2) = cmplx((/1,2/))
  !   complex(kind=prec) :: w(2) = cmplx((/3,4/))
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  !   call print_matrix(shuffle_product(v,w))
  ! end subroutine do_shuffle_tests
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END PROGRAM TEST
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! In terminal kann man den exit code bekommen via echo $?