Nonsymmetric Eigenvalue Problems

p?gehrd reduces a general matrix to upper Hessenberg form.
``` call psgehrd (n, ilo, ihi, a, ia, ja, desca, tau, work, lwork, info) call pdgehrd (n, ilo, ihi, a, ia, ja, desca, tau, work, lwork, info) call pcgehrd (n, ilo, ihi, a, ia, ja, desca, tau, work, lwork, info) call pzgehrd (n, ilo, ihi, a, ia, ja, desca, tau, work, lwork, info) ```

p?ormhr multiplies a general matrix by the orthogonal transformation matrix from a reduction to Hessenberg form determined by p?gehrd.
``` call psormhr (side, trans, m, n, ilo, ihi, a, ia, ja, desca, tau, c, ic, jc, descc, work, lwork, info) call pdormhr (side, trans, m, n, ilo, ihi, a, ia, ja, desca, tau, c, ic, jc, descc, work, lwork, info) ```

p?unmhr multiplies a general matrix by the unitary transformation matrix from a reduction to Hessenberg form determined by p?gehrd.
``` call pcunmhr (side, trans, m, n, ilo, ihi, a, ia, ja, desca, tau, c, ic, jc, descc, work, lwork, info) call pzunmhr (side, trans, m, n, ilo, ihi, a, ia, ja, desca, tau, c, ic, jc, descc, work, lwork, info) ```

p?lahqr computes the Schur decomposition and/or eigenvalues of a matrix already in Hessenberg form.
``` call pslahqr (wantt, wantz, n, ilo, ihi, a, desca, wr, wi, iloz, ihiz, z, descz, work, lwork, iwork, ilwork, info) call pdlahqr (wantt, wantz, n, ilo, ihi, a, desca, wr, wi, iloz, ihiz, z, descz, work, lwork, iwork, ilwork, info) ```

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