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https://github.com/TREX-CoE/Sherman-Morrison.git
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53 lines
1.4 KiB
Fortran
53 lines
1.4 KiB
Fortran
program Interface_test
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use Sherman_Morrison, only : MaponiA3
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use, intrinsic :: iso_c_binding, only : c_int, c_double
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implicit none
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integer i, j !! Iterators
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integer(c_int) :: dim, N_updates
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integer(c_int), dimension(:), allocatable :: Ar_index
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real(c_double), dimension(:,:), allocatable :: A, A0, Ar
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real(c_double), dimension(:,:), allocatable :: A0_inv
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dim = 3
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N_updates = dim
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allocate(Ar_index(dim), A(dim,dim), A0(dim,dim), Ar(dim,dim), A0_inv(dim,dim))
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!! Initialize A with M=3 and fill acc. to Eq. (17) from paper
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A(1,1) = 1.0d0
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A(1,2) = 1.0d0
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A(1,3) = -1.0d0
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A(2,1) = 1.0d0
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A(2,2) = 1.0d0
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A(2,3) = 0.0d0
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A(3,1) = -1.0d0
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A(3,2) = 0.0d0
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A(3,3) = -1.0d0
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!! Prepare the diagonal matrix A0 and the update matrix Ar
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do i=1,dim
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Ar_index(i) = i
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do j=1,dim
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if (i == j) then
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A0(i,j) = A(i,j)
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A0_inv(i,j) = 1.0d0 / A0(i,j)
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else
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A0(i,j) = 0.0d0
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A0_inv(i,j) = 0.0d0
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end if
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Ar(i,j) = A(i,j) - A0(i,j)
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end do
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end do
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call MaponiA3(A0, A0_inv, dim, n_updates, Ar, Ar_index)
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do i=1,dim
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do j=1,dim
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write(*,"(F3.0,3X)", advance="no") A0_inv(i,j)
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end do
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write(*,*)
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end do
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deallocate(Ar_index, A, A0, Ar, A0_inv)
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end program
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