ORGBR: generates one of the real orthogonal matrices Q or P**T determined by DGEBRD when reducing a real matrix A to bidiagonal form: A = Q * B * P**T. Q and P**T are defined as products of elementary reflectors H(i) or G(i) respectively. If VECT = 'Q', A is assumed to have been an M-by-K matrix, and Q is of order M: if m >= k, Q = H(1) H(2) . . . H(k) and ORGBR returns the first n columns of Q, where m >= n >= k; if m < k, Q = H(1) H(2) . . . H(m-1) and ORGBR returns Q as an M-by-M matrix. If VECT = 'P', A is assumed to have been a K-by-N matrix, and P**T is of order N: if k < n, P**T = G(k) . . . G(2) G(1) and ORGBR returns the first m rows of P**T, where n >= m >= k; if k >= n, P**T = G(n-1) . . . G(2) G(1) and ORGBR returns P**T as an N-by-N matrix.
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| pure subroutine | dorgbr (vect, m, n, k, a, lda, tau, work, lwork, info) |
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| | la_dorgbr |
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| | la_qorgbr |
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| pure subroutine | sorgbr (vect, m, n, k, a, lda, tau, work, lwork, info) |
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| | la_sorgbr |
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ORGBR: generates one of the real orthogonal matrices Q or P**T determined by DGEBRD when reducing a real matrix A to bidiagonal form: A = Q * B * P**T. Q and P**T are defined as products of elementary reflectors H(i) or G(i) respectively. If VECT = 'Q', A is assumed to have been an M-by-K matrix, and Q is of order M: if m >= k, Q = H(1) H(2) . . . H(k) and ORGBR returns the first n columns of Q, where m >= n >= k; if m < k, Q = H(1) H(2) . . . H(m-1) and ORGBR returns Q as an M-by-M matrix. If VECT = 'P', A is assumed to have been a K-by-N matrix, and P**T is of order N: if k < n, P**T = G(k) . . . G(2) G(1) and ORGBR returns the first m rows of P**T, where n >= m >= k; if k >= n, P**T = G(n-1) . . . G(2) G(1) and ORGBR returns P**T as an N-by-N matrix.
◆ dorgbr()
| pure subroutine la_lapack::orgbr::dorgbr |
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character, intent(in) | vect, |
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integer(ilp), intent(in) | m, |
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integer(ilp), intent(in) | n, |
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integer(ilp), intent(in) | k, |
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real(dp), dimension(lda,*), intent(inout) | a, |
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integer(ilp), intent(in) | lda, |
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real(dp), dimension(*), intent(in) | tau, |
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real(dp), dimension(*), intent(out) | work, |
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integer(ilp), intent(in) | lwork, |
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integer(ilp), intent(out) | info ) |
◆ la_dorgbr()
| la_lapack::orgbr::la_dorgbr |
◆ la_qorgbr()
| la_lapack::orgbr::la_qorgbr |
◆ la_sorgbr()
| la_lapack::orgbr::la_sorgbr |
◆ sorgbr()
| pure subroutine la_lapack::orgbr::sorgbr |
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character, intent(in) | vect, |
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integer(ilp), intent(in) | m, |
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integer(ilp), intent(in) | n, |
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integer(ilp), intent(in) | k, |
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real(sp), dimension(lda,*), intent(inout) | a, |
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integer(ilp), intent(in) | lda, |
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real(sp), dimension(*), intent(in) | tau, |
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real(sp), dimension(*), intent(out) | work, |
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integer(ilp), intent(in) | lwork, |
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integer(ilp), intent(out) | info ) |
The documentation for this interface was generated from the following file:
