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https://github.com/TREX-CoE/Sherman-Morrison.git
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60 lines
1.5 KiB
Fortran
60 lines
1.5 KiB
Fortran
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program Interface_test
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use Sherman_Morrison
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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 :: Updates_index
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real(c_double), dimension(:,:), allocatable :: A, S, Updates
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real(c_double), dimension(:,:), allocatable :: S_inv
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Dim = 3
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N_updates = 3
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allocate(Updates_index(Dim), A(Dim,Dim), S(Dim,Dim), Updates(Dim,Dim), S_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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do i=1,Dim
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do j=1,Dim
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write(*,"(F3.0,3X)", advance="no") A(i,j)
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end do
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write(*,*)
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end do
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write(*,*)
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!! Prepare the diagonal matrix S and the update matrix Updates
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do i=1,Dim
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Updates_index(i) = i
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do j=1,Dim
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if (i == j) then
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S(i,j) = A(i,j)
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S_inv(i,j) = 1.0d0 / S(i,j)
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else
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S(i,j) = 0.0d0
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S_inv(i,j) = 0.0d0
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end if
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Updates(i,j) = A(i,j) - S(i,j)
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end do
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end do
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call MaponiA3(S_inv, Dim, N_updates, Updates, Updates_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") S_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(Updates_index, A, S, Updates, S_inv)
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end program
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