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

Functions
Sub	Dgecov (Job As Long, N As Long, A() As Double, Ci() As Double, Info As Long)
	Unscaled covariance matrix of linear least squares problem solved by Dgels
Sub	Dgecovs (Job As Long, N As Long, A() As Double, S() As Double, Ci() As Double, Info As Long)
	Unscaled covariance matrix of linear least squares problem solved by Dgelss
Sub	Dgecovy (Job As Long, N As Long, A() As Double, Jpvt() As Long, Ci() As Double, Info As Long)
	Unscaled covariance matrix of linear least squares problem solved by Dgelsy
Sub	Dgels (Trans As String, M As Long, N As Long, A() As Double, B() As Double, Info As Long, Optional Nrhs As Long=1)
	Solution to overdetermined or underdetermined linear equations Ax = b (full rank)
Sub	Dgelsd (M As Long, N As Long, A() As Double, B() As Double, S() As Double, RCond As Double, Rank As Long, Info As Long, Optional Nrhs As Long=1)
	Solution to overdetermined or underdetermined linear equations Ax = b using the singular value decomposition (SVD) (Divide and conquer method)
Sub	Dgelss (M As Long, N As Long, A() As Double, B() As Double, S() As Double, RCond As Double, Rank As Long, Info As Long, Optional Nrhs As Long=1)
	Solution to overdetermined or underdetermined linear equations Ax = b using the singular value decomposition (SVD)
Sub	Dgelsy (M As Long, N As Long, A() As Double, B() As Double, Jpvt() As Long, RCond As Double, Rank As Long, Info As Long, Optional Nrhs As Long=1)
	Solution to overdetermined or underdetermined linear equations Ax = b using a complete orthogonal factorization
Sub	Dgetsls (Trans As String, M As Long, N As Long, A() As Double, B() As Double, Info As Long, Optional Nrhs As Long=1)
	Solution to overdetermined or underdetermined linear equations Ax = b (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).