geequ Interface

public interface geequ

GEEQU computes row and column scalings intended to equilibrate an M-by-N matrix A and reduce its condition number. R returns the row scale factors and C the column scale factors, chosen to try to make the largest element in each row and column of the matrix B with elements B(i,j)=R(i)A(i,j)C(j) have absolute value 1. R(i) and C(j) are restricted to be between SMLNUM = smallest safe number and BIGNUM = largest safe number. Use of these scaling factors is not guaranteed to reduce the condition number of A but works well in practice.


Subroutines

public pure subroutine cgeequ(m, n, a, lda, r, c, rowcnd, colcnd, amax, info)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
complex(kind=sp), intent(in) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
real(kind=sp), intent(out) :: r(*)
real(kind=sp), intent(out) :: c(*)
real(kind=sp), intent(out) :: rowcnd
real(kind=sp), intent(out) :: colcnd
real(kind=sp), intent(out) :: amax
integer(kind=ilp), intent(out) :: info

public pure subroutine dgeequ(m, n, a, lda, r, c, rowcnd, colcnd, amax, info)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
real(kind=dp), intent(in) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
real(kind=dp), intent(out) :: r(*)
real(kind=dp), intent(out) :: c(*)
real(kind=dp), intent(out) :: rowcnd
real(kind=dp), intent(out) :: colcnd
real(kind=dp), intent(out) :: amax
integer(kind=ilp), intent(out) :: info

public pure subroutine sgeequ(m, n, a, lda, r, c, rowcnd, colcnd, amax, info)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
real(kind=sp), intent(in) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
real(kind=sp), intent(out) :: r(*)
real(kind=sp), intent(out) :: c(*)
real(kind=sp), intent(out) :: rowcnd
real(kind=sp), intent(out) :: colcnd
real(kind=sp), intent(out) :: amax
integer(kind=ilp), intent(out) :: info

public pure subroutine zgeequ(m, n, a, lda, r, c, rowcnd, colcnd, amax, info)

Arguments

Type IntentOptional Attributes Name
integer(kind=ilp), intent(in) :: m
integer(kind=ilp), intent(in) :: n
complex(kind=dp), intent(in) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
real(kind=dp), intent(out) :: r(*)
real(kind=dp), intent(out) :: c(*)
real(kind=dp), intent(out) :: rowcnd
real(kind=dp), intent(out) :: colcnd
real(kind=dp), intent(out) :: amax
integer(kind=ilp), intent(out) :: info

Module Procedures

public interface stdlib_cgeequ()

Arguments

None

public interface stdlib_dgeequ()

Arguments

None

public interface stdlib_sgeequ()

Arguments

None

public interface stdlib_zgeequ()

Arguments

None