Symmetric Eigenproblems

?syev computes all eigenvalues and, optionally, eigenvectors of a real symmetric matrix.
``` call ssyev (jobz, uplo, n, a, lda, w, work, lwork, info) call dsyev (jobz, uplo, n, a, lda, w, work, lwork, info) ```

?heev computes all eigenvalues and, optionally, eigenvectors of a Hermitian matrix.
``` call cheev (jobz, uplo, n, a, lda, w, work, lwork, rwork, info) call zheev (jobz, uplo, n, a, lda, w, work, lwork, rwork, info) ```

?syevd computes all eigenvalues and, optionally, all eigenvectors of a real symmetric matrix using a divide and conquer algorithm.
``` call ssyevd (job, uplo, n, a, lda, w, work, lwork, iwork, liwork, info) call dsyevd (job, uplo, n, a, lda, w, work, lwork, iwork, liwork, info) ```

?heevd computes all eigenvalues and, optionally, all eigenvectors of a complex Hermitian matrix using a divide and conquer algorithm.
``` call cheevd (job, uplo, n, a, lda, w, work, lwork, rwork, lrwork, iwork, liwork, info) call zheevd (job, uplo, n, a, lda, w, work, lwork, rwork, lrwork, iwork, liwork, info) ```

?syevx computes selected eigenvalues and, optionally, eigenvectors of a symmetric matrix.
``` call ssyevx (jobz, range, uplo, n, a, lda, vl, vu, il, iu, abstol, m, w, z, ldz, work, lwork, iwork, ifail, info) call dsyevx (jobz, range, uplo, n, a, lda, vl, vu, il, iu, abstol, m, w, z, ldz, work, lwork, iwork, ifail, info) ```

?heevx computes selected eigenvalues and, optionally, eigenvectors of a Hermitian matrix.
``` call cheevx (jobz, range, uplo, n, a, lda, vl, vu, il, iu, abstol, m, w, z, ldz, work, lwork, rwork, iwork, ifail, info) call zheevx (jobz, range, uplo, n, a, lda, vl, vu, il, iu, abstol, m, w, z, ldz, work, lwork, rwork, iwork, ifail, info) ```

?syevr computes selected eigenvalues and, optionally, eigenvectors of a real symmetric matrix using the Relatively Robust Representations.
``` call ssyevr (jobz, range, uplo, n, a, lda, vl, vu, il, iu, abstol, m, w, z, ldz, isuppz, work, lwork, iwork, liwork, info) call dsyevr (jobz, range, uplo, n, a, lda, vl, vu, il, iu, abstol, m, w, z, ldz, isuppz, work, lwork, iwork, liwork, info) ```

?heevr computes selected eigenvalues and, optionally, eigenvectors of a Hermitian matrix using the Relatively Robust Representations.
``` call cheevr (jobz, range, uplo, n, a, lda, vl, vu, il, iu, abstol, m, w, z, ldz, isuppz, work, lwork, rwork, lrwork, iwork, liwork, info) call zheevr (jobz, range, uplo, n, a, lda, vl, vu, il, iu, abstol, m, w, z, ldz, isuppz, work, lwork, rwork, lrwork, iwork, liwork, info) ```

?spev computes all eigenvalues and, optionally, eigenvectors of a real symmetric matrix in packed storage.
``` call sspev (jobz, uplo, n, ap, w, z, ldz, work, info) call dspev (jobz, uplo, n, ap, w, z, ldz, work, info) ```

?hpev computes all eigenvalues and, optionally, eigenvectors of a Hermitian matrix in packed storage.
``` call chpev (jobz, uplo, n, ap, w, z, ldz, work, rwork, info) call zhpev (jobz, uplo, n, ap, w, z, ldz, work, rwork, info) ```

?spevd uses a divide and conquer algorithm to compute all eigenvalues and, optionally, all eigenvectors of a real symmetric matrix held in packed storage.
``` call sspevd (job ,uplo, n, ap, w, z, ldz, work, lwork, iwork, liwork, info) call dspevd (job ,uplo, n, ap, w, z, ldz, work, lwork, iwork, liwork, info) ```

?hpevd uses a divide and conquer algorithm to compute all eigenvalues and, optionally, all eigenvectors of a complex Hermitian matrix held in packed storage.
``` call chpevd (job, uplo, n, ap, w, z, ldz, work, lwork, rwork, lrwork, iwork, liwork, info) call zhpevd (job, uplo, n, ap, w, z, ldz, work, lwork, rwork, lrwork, iwork, liwork, info) ```

?spevx computes selected eigenvalues and, optionally, eigenvectors of a real symmetric matrix in packed storage.
``` call sspevx (jobz, range, uplo, n, ap, vl, vu, il, iu, abstol, m, w, z, ldz, work, iwork, ifail, info) call dspevx (jobz, range, uplo, n, ap, vl, vu, il, iu, abstol, m, w, z, ldz, work, iwork, ifail, info) ```

?hpevx computes selected eigenvalues and, optionally, eigenvectors of a Hermitian matrix in packed storage.
``` call chpevx (jobz, range, uplo, n, ap, vl, vu, il, iu, abstol, m, w, z, ldz, work, rwork, iwork, ifail, info) call zhpevx (jobz, range, uplo, n, ap, vl, vu, il, iu, abstol, m, w, z, ldz, work, rwork, iwork, ifail, info) ```

?sbev computes all eigenvalues and, optionally, eigenvectors of a real symmetric band matrix.
``` call ssbev (jobz, uplo, n, kd, ab, ldab, w, z, ldz, work, info) call dsbev (jobz, uplo, n, kd, ab, ldab, w, z, ldz, work, info) ```

?hbev computes all eigenvalues and, optionally, eigenvectors of a Hermitian band matrix.
``` call chbev (jobz, uplo, n, kd, ab, ldab, w, z, ldz, work, rwork, info) call zhbev (jobz, uplo, n, kd, ab, ldab, w, z, ldz, work, rwork, info) ```

?sbevd computes all eigenvalues and, optionally, all eigenvectors of a real symmetric band matrix using a divide and conquer algorithm.
``` call ssbevd (job, uplo, n, kd, ab, ldab, w, z, ldz, work, lwork, iwork, liwork, info) call dsbevd (job, uplo, n, kd, ab, ldab, w, z, ldz, work, lwork, iwork, liwork, info) ```

?hbevd computes all eigenvalues and, optionally, all eigenvectors of a complex Hermitian band matrix using a divide and conquer algorithm.
``` call chbevd (job, uplo, n, kd, ab, ldab, w, z, ldz, work, lwork, rwork, lrwork, iwork, liwork, info) call zhbevd (job, uplo, n, kd, ab, ldab, w, z, ldz, work, lwork, rwork, lrwork, iwork, liwork, info) ```

?sbevx computes selected eigenvalues and, optionally, eigenvectors of a real symmetric band matrix.
``` call ssbevx (jobz, range, uplo, n, kd, ab, ldab, q, ldq, vl, vu, il, iu, abstol, m, w, z, ldz, work, iwork, ifail, info) call dsbevx (jobz, range, uplo, n, kd, ab, ldab, q, ldq, vl, vu, il, iu, abstol, m, w, z, ldz, work, iwork, ifail, info) ```

?hbevx computes selected eigenvalues and, optionally, eigenvectors of a Hermitian band matrix.
``` call chbevx (jobz, range, uplo, n, kd, ab, ldab, q, ldq, vl, vu, il, iu, abstol, m, w, z, ldz, work, rwork, iwork, ifail, info) call zhbevx (jobz, range, uplo, n, kd, ab, ldab, q, ldq, vl, vu, il, iu, abstol, m, w, z, ldz, work, rwork, iwork, ifail, info) ```

?stev computes all eigenvalues and, optionally, eigenvectors of a real symmetric tridiagonal matrix.
``` call sstev (jobz, n, d, e, z, ldz, work, info) call dstev (jobz, n, d, e, z, ldz, work, info) ```

?stevd computes all eigenvalues and, optionally, all eigenvectors of a real symmetric tridiagonal matrix using a divide and conquer algorithm.
``` call sstevd (job, n, d, e, z, ldz, work, lwork, iwork, liwork, info) call dstevd (job, n, d, e, z, ldz, work, lwork, iwork, liwork, info) ```

?stevx computes selected eigenvalues and eigenvectors of a real symmetric tridiagonal matrix.
``` call sstevx (jobz, range, n, d, e, vl, vu, il, iu, abstol, m, w, z, ldz, work, iwork, ifail, info) call dstevx (jobz, range, n, d, e, vl, vu, il, iu, abstol, m, w, z, ldz, work, iwork, ifail, info) ```

?stevr computes selected eigenvalues and, optionally, eigenvectors of a real symmetric tridiagonal matrix using the Relatively Robust Representations.
``` call sstevr (jobz, range, n, d, e, vl, vu, il, iu, abstol, m, w, z, ldz, isuppz, work, lwork, iwork, liwork, info) call dstevr (jobz, range, n, d, e, vl, vu, il, iu, abstol, m, w, z, ldz, isuppz, work, lwork, iwork, liwork, info) ```

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