getsqrhrt Interface

public interface getsqrhrt

GETSQRHRT computes a NB2-sized column blocked QR-factorization of a complex M-by-N matrix A with M >= N, A = Q * R. The routine uses internally a NB1-sized column blocked and MB1-sized row blocked TSQR-factorization and perfors the reconstruction of the Householder vectors from the TSQR output. The routine also converts the R_tsqr factor from the TSQR-factorization output into the R factor that corresponds to the Householder QR-factorization, A = Q_tsqr * R_tsqr = Q * R. The output Q and R factors are stored in the same format as in CGEQRT (Q is in blocked compact WY-representation). See the documentation of CGEQRT for more details on the format.


Subroutines

public pure subroutine cgetsqrhrt(m, n, mb1, nb1, nb2, a, lda, t, ldt, work, lwork, info)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: mb1
integer(kind=ilp), intent(in) :: nb1
integer(kind=ilp), intent(in) :: nb2
complex(kind=sp), intent(inout) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
complex(kind=sp), intent(out) :: t(ldt,*)
integer(kind=ilp), intent(in) :: ldt
complex(kind=sp), intent(out) :: work(*)
integer(kind=ilp), intent(in) :: lwork
integer(kind=ilp), intent(out) :: info

public pure subroutine dgetsqrhrt(m, n, mb1, nb1, nb2, a, lda, t, ldt, work, lwork, info)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: mb1
integer(kind=ilp), intent(in) :: nb1
integer(kind=ilp), intent(in) :: nb2
real(kind=dp), intent(inout) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
real(kind=dp), intent(out) :: t(ldt,*)
integer(kind=ilp), intent(in) :: ldt
real(kind=dp), intent(out) :: work(*)
integer(kind=ilp), intent(in) :: lwork
integer(kind=ilp), intent(out) :: info

public pure subroutine sgetsqrhrt(m, n, mb1, nb1, nb2, a, lda, t, ldt, work, lwork, info)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: mb1
integer(kind=ilp), intent(in) :: nb1
integer(kind=ilp), intent(in) :: nb2
real(kind=sp), intent(inout) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
real(kind=sp), intent(out) :: t(ldt,*)
integer(kind=ilp), intent(in) :: ldt
real(kind=sp), intent(out) :: work(*)
integer(kind=ilp), intent(in) :: lwork
integer(kind=ilp), intent(out) :: info

public pure subroutine zgetsqrhrt(m, n, mb1, nb1, nb2, a, lda, t, ldt, work, lwork, info)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: mb1
integer(kind=ilp), intent(in) :: nb1
integer(kind=ilp), intent(in) :: nb2
complex(kind=dp), intent(inout) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
complex(kind=dp), intent(out) :: t(ldt,*)
integer(kind=ilp), intent(in) :: ldt
complex(kind=dp), intent(out) :: work(*)
integer(kind=ilp), intent(in) :: lwork
integer(kind=ilp), intent(out) :: info

Module Procedures

public interface stdlib_cgetsqrhrt()

Arguments

None

public interface stdlib_dgetsqrhrt()

Arguments

None

public interface stdlib_sgetsqrhrt()

Arguments

None

public interface stdlib_zgetsqrhrt()

Arguments

None