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BUILT-IN MATHEMATICA SYMBOL
QRDecomposition
QRDecomposition[m]
yields the QR decomposition for a numerical matrix m. The result is a list 
, where q is an orthogonal matrix and r is an upper-triangular matrix.
Details and Options
- The original matrix m is equal to ConjugateTranspose[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
where p is a permutation matrix such that 
is equal to ConjugateTranspose[q].r. »
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