UNGBR: generates one of the complex unitary matrices Q or P**H determined by CGEBRD when reducing a complex matrix A to bidiagonal form: A = Q * B * P**H. Q and P**H 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 UNGBR returns the first n columns of Q, where m >= n >= k; if m < k, Q = H(1) H(2) . . . H(m-1) and UNGBR returns Q as an M-by-M matrix. If VECT = 'P', A is assumed to have been a K-by-N matrix, and P**H is of order N: if k < n, P**H = G(k) . . . G(2) G(1) and UNGBR returns the first m rows of P**H, where n >= m >= k; if k >= n, P**H = G(n-1) . . . G(2) G(1) and UNGBR returns P**H as an N-by-N matrix.
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| pure subroutine | cungbr (vect, m, n, k, a, lda, tau, work, lwork, info) |
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| | la_cungbr |
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| | la_wungbr |
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| pure subroutine | zungbr (vect, m, n, k, a, lda, tau, work, lwork, info) |
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| | la_zungbr |
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UNGBR: generates one of the complex unitary matrices Q or P**H determined by CGEBRD when reducing a complex matrix A to bidiagonal form: A = Q * B * P**H. Q and P**H 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 UNGBR returns the first n columns of Q, where m >= n >= k; if m < k, Q = H(1) H(2) . . . H(m-1) and UNGBR returns Q as an M-by-M matrix. If VECT = 'P', A is assumed to have been a K-by-N matrix, and P**H is of order N: if k < n, P**H = G(k) . . . G(2) G(1) and UNGBR returns the first m rows of P**H, where n >= m >= k; if k >= n, P**H = G(n-1) . . . G(2) G(1) and UNGBR returns P**H as an N-by-N matrix.
◆ cungbr()
| pure subroutine la_lapack::ungbr::cungbr |
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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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complex(sp), dimension(lda,*), intent(inout) | a, |
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integer(ilp), intent(in) | lda, |
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complex(sp), dimension(*), intent(in) | tau, |
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complex(sp), dimension(*), intent(out) | work, |
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integer(ilp), intent(in) | lwork, |
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integer(ilp), intent(out) | info ) |
◆ la_cungbr()
| la_lapack::ungbr::la_cungbr |
◆ la_wungbr()
| la_lapack::ungbr::la_wungbr |
◆ la_zungbr()
| la_lapack::ungbr::la_zungbr |
◆ zungbr()
| pure subroutine la_lapack::ungbr::zungbr |
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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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complex(dp), dimension(lda,*), intent(inout) | a, |
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integer(ilp), intent(in) | lda, |
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complex(dp), dimension(*), intent(in) | tau, |
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complex(dp), 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:
