QR decomposition: Difference between revisions
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→{{header|Fortran}}
m (→Jama) |
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Line 1,478:
implicit none
integer, parameter :: n = 4
real(8) :: durer(n, n) = reshape(dble([
16, 5,
13, 8, 12, 1 &
]), [n, n])
real(8) :: q(n, n), r(n, n), qr(n, n), id(n, n), tau(n)
integer, parameter :: lwork = 1024
real(8) :: work(lwork)
integer :: info, i, j
q = durer
call dgeqrf(n, n, q, n, tau, work, lwork, info)
r = 0d0
forall (i = 1:n, j = 1:n, j >= i) r(i, j) = q(i, j)
call dorgqr(n, n, n, q, n, tau, work, lwork, info)
qr = matmul(q, r)
id = matmul(q, transpose(q))
call show(4, durer, "A")
call show(4, q, "Q")
Line 1,508 ⟶ 1,510:
integer :: n, i
real(8) :: a(n, n)
print *, s
do i = 1, n
print 1, a(i, :)
1 format (*(
end do
end subroutine
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