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The PxLAHQR test program generates random upper Hessenberg matrices,
completes a Schur decomposition on them, and then tests the resulting
Schur decomposition for maintaining similarity.
The following tests will be performed on P_LAHQR:
where is the Schur vectors of the upper Hessenberg matrix when
the Schur vector and Schur decomposition option is given. is the
order of the matrix, represents PxLAMCH( ICTXT, 'P' ), and the
one-norm is used for the norm computations.