laqps Interface

public interface laqps

LAQPS computes a step of QR factorization with column pivoting of a complex M-by-N matrix A by using Blas-3. It tries to factorize NB columns from A starting from the row OFFSET+1, and updates all of the matrix with Blas-3 xGEMM. In some cases, due to catastrophic cancellations, it cannot factorize NB columns. Hence, the actual number of factorized columns is returned in KB. Block A(1:OFFSET,1:N) is accordingly pivoted, but not factorized.


Subroutines

public pure subroutine claqps(m, n, offset, nb, kb, a, lda, jpvt, tau, vn1, vn2, auxv, f, ldf)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: offset
integer(kind=ilp), intent(in) :: nb
integer(kind=ilp), intent(out) :: kb
complex(kind=sp), intent(inout) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
integer(kind=ilp), intent(inout) :: jpvt(*)
complex(kind=sp), intent(out) :: tau(*)
real(kind=sp), intent(inout) :: vn1(*)
real(kind=sp), intent(inout) :: vn2(*)
complex(kind=sp), intent(inout) :: auxv(*)
complex(kind=sp), intent(inout) :: f(ldf,*)
integer(kind=ilp), intent(in) :: ldf

public pure subroutine dlaqps(m, n, offset, nb, kb, a, lda, jpvt, tau, vn1, vn2, auxv, f, ldf)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: offset
integer(kind=ilp), intent(in) :: nb
integer(kind=ilp), intent(out) :: kb
real(kind=dp), intent(inout) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
integer(kind=ilp), intent(inout) :: jpvt(*)
real(kind=dp), intent(out) :: tau(*)
real(kind=dp), intent(inout) :: vn1(*)
real(kind=dp), intent(inout) :: vn2(*)
real(kind=dp), intent(inout) :: auxv(*)
real(kind=dp), intent(inout) :: f(ldf,*)
integer(kind=ilp), intent(in) :: ldf

public pure subroutine slaqps(m, n, offset, nb, kb, a, lda, jpvt, tau, vn1, vn2, auxv, f, ldf)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: offset
integer(kind=ilp), intent(in) :: nb
integer(kind=ilp), intent(out) :: kb
real(kind=sp), intent(inout) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
integer(kind=ilp), intent(inout) :: jpvt(*)
real(kind=sp), intent(out) :: tau(*)
real(kind=sp), intent(inout) :: vn1(*)
real(kind=sp), intent(inout) :: vn2(*)
real(kind=sp), intent(inout) :: auxv(*)
real(kind=sp), intent(inout) :: f(ldf,*)
integer(kind=ilp), intent(in) :: ldf

public pure subroutine zlaqps(m, n, offset, nb, kb, a, lda, jpvt, tau, vn1, vn2, auxv, f, ldf)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
integer(kind=ilp), intent(in) :: offset
integer(kind=ilp), intent(in) :: nb
integer(kind=ilp), intent(out) :: kb
complex(kind=dp), intent(inout) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
integer(kind=ilp), intent(inout) :: jpvt(*)
complex(kind=dp), intent(out) :: tau(*)
real(kind=dp), intent(inout) :: vn1(*)
real(kind=dp), intent(inout) :: vn2(*)
complex(kind=dp), intent(inout) :: auxv(*)
complex(kind=dp), intent(inout) :: f(ldf,*)
integer(kind=ilp), intent(in) :: ldf

Module Procedures

public interface stdlib_claqps()

Arguments

None

public interface stdlib_dlaqps()

Arguments

None

public interface stdlib_slaqps()

Arguments

None

public interface stdlib_zlaqps()

Arguments

None