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29 lines
648 B
Fortran
29 lines
648 B
Fortran
program test_j_mu_of_r
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implicit none
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double precision :: x,mu_min,dmu,mu_max, mu, mu_p, mu_m
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double precision :: j_simple,j_p, j_m,numeric_d_mu,d_dx_mu
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double precision :: accu
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integer :: npt,i
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npt = 1000
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mu_min = 0.3d0
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mu_max = 10.d0
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dmu = (mu_max - mu_min)/dble(npt)
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x = 0.7d0
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mu = mu_min
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do i = 1, npt
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call get_deriv_mu_j12(x,mu,d_dx_mu)
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mu_p = mu + dmu
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mu_m = mu - dmu
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j_p = j_simple(x,mu_p)
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j_m = j_simple(x,mu_m)
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numeric_d_mu = 0.5d0 * (j_p - j_m)/dmu
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print*,mu
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print*,numeric_d_mu,d_dx_mu,dabs(d_dx_mu-numeric_d_mu)
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accu += dabs(d_dx_mu-numeric_d_mu)
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mu += dmu
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enddo
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accu *= dmu
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print*,'accu = ',accu
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end
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