QRDecomposition
 Usage
• QRDecomposition[m] yields the QR decomposition for a numerical matrix m. The result is a list {q, r}, where q is an orthogonal matrix and r is an upper-triangular matrix.
Notes
• The original matrix m is equal to Conjugate[Transpose[q]] . r. • For non-square matrices, q is row orthonormal. • The matrix r has zeros for all entries below the leading diagonal. • QRDecomposition[m, Pivoting -> True] yields a list {q, r, p} where p is a permutation matrix such that m . p is equal to Conjugate[Transpose[q]] . r. • New in Version 2. • Advanced Documentation.
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