QR factorization & backsubstitution

• Subject: QR factorization & backsubstitution
• From: Ether Jones
• Date: Thu, 7 Mar 2013 17:01:51 -0800 (PST)

Does Maxima have QR factorization built in?

i.e.? A = Q*R

where A has more rows than columns, Q is orthogonal, and R is upper triangular?

Also, does? Maxima have a backsubstitution method, so that 
the overdetermined linear system? Ax~b can be solved using QR factorization by solving Rx=Q'b by backsubstitution?

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