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! $Header$
#include "cctk.h"
module matexp
use constants
implicit none
private
public calc_exp3
contains
subroutine calc_exp3 (h3, g3)
CCTK_REAL, intent(in) :: h3(3,3)
CCTK_REAL, intent(out) :: g3(3,3)
CCTK_REAL :: nfact
CCTK_REAL :: tmp(3,3)
integer :: n
g3 = delta3
nfact = 1
tmp = delta3
do n = 1, 18
nfact = nfact * n
tmp = matmul (h3, tmp)
! exp(x) = sum_n x^n / n!
g3 = g3 + tmp / nfact
end do
end subroutine calc_exp3
end module matexp
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