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zouji1983½ð³æ (ÕýʽдÊÖ)
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ÇóÖú£ºludcmp&lubksb
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subroutine ludcmp(coeff, numvar, np, indx, d) integer :: numvar, np, indx(numvar) doubleprecision :: d, coeff(np,np) integer, parameter :: nmax=500 doubleprecision, parameter :: tiny=1.0d-20 integer :: i, imax, j, k doubleprecision :: aamax, dum, sum, vv(nmax) d=1 do i = 1, numvar aamax = 0.d0 do j = 1, numvar if (abs(coeff(i,j)).gt.aamax) aamax = abs(coeff(i,j)) end do !if (aamax .eq. 0.d0) pause 'singular matrix in ludcmp' vv(i) = 1./aamax end do do j = 1, numvar do i= 1, j-1 sum = coeff(i,j) do k=1,i-1 sum = sum-coeff(i,k)*coeff(k,j) end do coeff(i,j) = sum end do aamax = 0.d0 do i = j,numvar sum = coeff(i,j) do k=1, j-1 sum = sum - coeff(i,k) * coeff(k,j) end do coeff(i,j) = sum dum = vv(i) * abs(sum) if (dum .ge. aamax) then imax = i aamax = dum end if end do if (j .ne. imax) then do k = 1, numvar dum = coeff(imax,k) coeff(imax,k) = coeff(j,k) coeff(j,k) = dum end do d = -d vv(imax) = vv(j) end if indx(j) = imax if (coeff(j,j) .eq. 0.d0) coeff(j,j) = tiny if (j .ne. numvar) then dum = 1./coeff(j,j) do i = j+1, numvar coeff(i,j) = coeff(i,j) * dum end do end if end do return end subroutine ludcmp Çë½Ì£¬Õâ¸öµÄ¹¦ÄÜÊÇÔõÑùµÄ£¬Ð»Ð»£¡ |
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