D9a. Overdetermined or underdetermined systems of linear equations (unconstrained) (complex)

Functions
void	zgecov (int job, int n, int lda, doublecomplex a[], doublecomplex ci[], int *info)
	Unscaled covariance matrix of linear least squares problem solved by zgels
void	zgecovs (int job, int n, int lda, doublecomplex a[], double s[], doublecomplex ci[], doublecomplex work[], int *info)
	Unscaled covariance matrix of linear least squares problem solved by zgelss
void	zgecovy (int job, int n, int lda, doublecomplex a[], int ipiv[], doublecomplex ci[], int iwork[], int *info)
	Unscaled covariance matrix of linear least squares problem solved by zgelsy
void	zgels (char trans, int m, int n, int nrhs, int lda, doublecomplex a[], int ldb, doublecomplex b[], doublecomplex work[], int lwork, int *info)
	Solution to overdetermined or underdetermined linear equations Ax = b for complex matrices (Full rank)
void	zgelsd (int m, int n, int nrhs, int lda, doublecomplex a[], int ldb, doublecomplex b[], double s[], double rcond, int *rank, doublecomplex work[], int lwork, double rwork[], int iwork[], int *info)
	Solution to overdetermined or underdetermined linear equations Ax = b for complex matrices using the singular value decomposition (SVD) (Divide and conquer method)
void	zgelss (int m, int n, int nrhs, int lda, doublecomplex a[], int ldb, doublecomplex b[], double s[], double rcond, int *rank, doublecomplex work[], int lwork, double rwork[], int *info)
	Solution to overdetermined or underdetermined linear equations Ax = b for complex matrices using the singular value decomposition (SVD)
void	zgelsy (int m, int n, int nrhs, int lda, doublecomplex a[], int ldb, doublecomplex b[], int jpvt[], double rcond, int *rank, doublecomplex work[], int lwork, double rwork[], int *info)
	Solution to overdetermined or underdetermined linear equations Ax = b for complex matrices using a complete orthogonal factorization
void	zgetsls (char trans, int m, int n, int nrhs, int lda, doublecomplex a[], int ldb, doublecomplex b[], doublecomplex work[], int lwork, int *info)
	Solution to overdetermined or underdetermined linear equations Ax = b for complex matrices (Full rank) (Tall skinny QR or short wide LQ factorization)

Detailed Description

This is the group of D9a. Overdetermined or underdetermined systems of linear equations (unconstrained) (complex).