potrf2 Interface

public interface potrf2

POTRF2 computes the Cholesky factorization of a Hermitian positive definite matrix A using the recursive algorithm. The factorization has the form A = UH * U, if UPLO = 'U', or A = L * LH, if UPLO = 'L', where U is an upper triangular matrix and L is lower triangular. This is the recursive version of the algorithm. It divides the matrix into four submatrices: [ A11 | A12 ] where A11 is n1 by n1 and A22 is n2 by n2 A = [ -----|----- ] with n1 = n/2 [ A21 | A22 ] n2 = n-n1 The subroutine calls itself to factor A11. Update and scale A21 or A12, update A22 then calls itself to factor A22.


Subroutines

public pure recursive subroutine cpotrf2(uplo, n, a, lda, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
complex(kind=sp), intent(inout) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
integer(kind=ilp), intent(out) :: info

public pure recursive subroutine dpotrf2(uplo, n, a, lda, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
real(kind=dp), intent(inout) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
integer(kind=ilp), intent(out) :: info

public pure recursive subroutine spotrf2(uplo, n, a, lda, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
real(kind=sp), intent(inout) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
integer(kind=ilp), intent(out) :: info

public pure recursive subroutine zpotrf2(uplo, n, a, lda, info)

Arguments

Type IntentOptional Attributes Name
character(len=1), intent(in) :: uplo
integer(kind=ilp), intent(in) :: n
complex(kind=dp), intent(inout) :: a(lda,*)
integer(kind=ilp), intent(in) :: lda
integer(kind=ilp), intent(out) :: info

Module Procedures

public interface stdlib_cpotrf2()

Arguments

None

public interface stdlib_dpotrf2()

Arguments

None

public interface stdlib_spotrf2()

Arguments

None

public interface stdlib_zpotrf2()

Arguments

None