QR

 

 Orthogonal-triangular decomposition.

  [Q,R] = QR(X) produces an upper triangular matrix R of

  the same dimension as X and a unitary matrix Q so that

  X = Q*R.

  [Q,R,E] = QR(X) produces a permutation matrix E , an

  upper triangular R with decreasing diagonal elements and

  a unitary Q so that X*E = Q*R.

  By itself, QR(X) returns the output of LINPACK'S ZQRDC

  routine.  TRIU2906TAB(QR(X)) is R.

 

 

  See also QRDELETELN400N, QRINSERTJE23UW.