mirror of
https://github.com/TREX-CoE/Sherman-Morrison.git
synced 2024-08-25 22:51:46 +02:00
60 lines
1.5 KiB
Fortran
60 lines
1.5 KiB
Fortran
![]() |
program Interface_test
|
||
|
use Sherman_Morrison
|
||
|
implicit none
|
||
|
|
||
|
integer i, j !! Iterators
|
||
|
integer(c_int) :: Dim, N_updates
|
||
|
integer(c_int), dimension(:), allocatable :: Updates_index
|
||
|
real(c_double), dimension(:,:), allocatable :: A, S, Updates
|
||
|
real(c_double), dimension(:,:), allocatable :: S_inv
|
||
|
|
||
|
Dim = 3
|
||
|
N_updates = 3
|
||
|
allocate(Updates_index(Dim), A(Dim,Dim), S(Dim,Dim), Updates(Dim,Dim), S_inv(Dim,Dim))
|
||
|
|
||
|
!! Initialize A with M=3 and fill acc. to Eq. (17) from paper
|
||
|
A(1,1) = 1.0d0
|
||
|
A(1,2) = 1.0d0
|
||
|
A(1,3) = -1.0d0
|
||
|
A(2,1) = 1.0d0
|
||
|
A(2,2) = 1.0d0
|
||
|
A(2,3) = 0.0d0
|
||
|
A(3,1) = -1.0d0
|
||
|
A(3,2) = 0.0d0
|
||
|
A(3,3) = -1.0d0
|
||
|
|
||
|
do i=1,Dim
|
||
|
do j=1,Dim
|
||
|
write(*,"(F3.0,3X)", advance="no") A(i,j)
|
||
|
end do
|
||
|
write(*,*)
|
||
|
end do
|
||
|
write(*,*)
|
||
|
|
||
|
!! Prepare the diagonal matrix S and the update matrix Updates
|
||
|
do i=1,Dim
|
||
|
Updates_index(i) = i
|
||
|
do j=1,Dim
|
||
|
if (i == j) then
|
||
|
S(i,j) = A(i,j)
|
||
|
S_inv(i,j) = 1.0d0 / S(i,j)
|
||
|
else
|
||
|
S(i,j) = 0.0d0
|
||
|
S_inv(i,j) = 0.0d0
|
||
|
end if
|
||
|
Updates(i,j) = A(i,j) - S(i,j)
|
||
|
end do
|
||
|
end do
|
||
|
|
||
|
call MaponiA3(S_inv, Dim, N_updates, Updates, Updates_index)
|
||
|
|
||
|
do i=1,Dim
|
||
|
do j=1,Dim
|
||
|
write(*,"(F3.0,3X)", advance="no") S_inv(i,j)
|
||
|
end do
|
||
|
write(*,*)
|
||
|
end do
|
||
|
|
||
|
deallocate(Updates_index, A, S, Updates, S_inv)
|
||
|
end program
|