Symmetric Eigenproblems

p?syev computes selected eigenvalues and eigenvectors of a symmetric matrix.
call pssyev (jobz, uplo, n, a, ia, ja, desca, w, z, iz, jz, descz, work, lwork, info)
call pdsyev (jobz, uplo, n, a, ia, ja, desca, w, z, iz, jz, descz, work, lwork, info)

p?syevx computes selected eigenvalues and, optionally, eigenvectors of a symmetric matrix.
call pssyevx (jobz, range, uplo, n, a, ia, ja, desca, vl, vu, il, iu, abstol, m, nz, w, orfac, z, iz, jz, descz, work, lwork, iwork, liwork, ifail, iclustr, gap, info)
call pdsyevx (jobz, range, uplo, n, a, ia, ja, desca, vl, vu, il, iu, abstol, m, nz, w, orfac, z, iz, jz, descz, work, lwork, iwork, liwork, ifail, iclustr, gap, info)

p?heevx computes selected eigenvalues and, optionally, eigenvectors of a Hermitian matrix.
call pcheevx (jobz, range, uplo, n, a, ia, ja, desca, vl, vu, il, iu, abstol, m, nz, w, orfac, z, iz, jz, descz, work, lwork, rwork, lrwork, iwork, liwork, ifail, iclustr, gap, info)
call pzheevx (jobz, range, uplo, n, a, ia, ja, desca, vl, vu, il, iu, abstol, m, nz, w, orfac, z, iz, jz, descz, work, lwork, rwork, lrwork, iwork, liwork, ifail, iclustr, gap, info)

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