QR decomposition: Difference between revisions
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See the documentation for the [http://www.netlib.org/lapack/lapack-3.1.1/html/dgeqrf.f.html DGEQRF] and [http://www.netlib.org/lapack/explore-3.1.1-html/dorgqr.f.html DORGQR] routines. Here the example matrix is the magic square from Albrecht Dürer's ''[https://en.wikipedia.org/wiki/Melencolia_I Melencolia I]''.
<lang fortran>program qrtask
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