--- 
:name: sstev
:md5sum: 51a1acebfd740cd57ebd5d2033013bbe
:category: :subroutine
:arguments: 
- jobz: 
    :type: char
    :intent: input
- n: 
    :type: integer
    :intent: input
- d: 
    :type: real
    :intent: input/output
    :dims: 
    - n
- e: 
    :type: real
    :intent: input/output
    :dims: 
    - n-1
- z: 
    :type: real
    :intent: output
    :dims: 
    - ldz
    - n
- ldz: 
    :type: integer
    :intent: input
- work: 
    :type: real
    :intent: workspace
    :dims: 
    - "lsame_(&jobz,\"N\") ? 0 : MAX(1,2*n-2)"
- info: 
    :type: integer
    :intent: output
:substitutions: 
  ldz: "lsame_(&jobz,\"V\") ? MAX(1,n) : 1"
:fortran_help: "      SUBROUTINE SSTEV( JOBZ, N, D, E, Z, LDZ, WORK, INFO )\n\n\
  *  Purpose\n\
  *  =======\n\
  *\n\
  *  SSTEV computes all eigenvalues and, optionally, eigenvectors of a\n\
  *  real symmetric tridiagonal matrix A.\n\
  *\n\n\
  *  Arguments\n\
  *  =========\n\
  *\n\
  *  JOBZ    (input) CHARACTER*1\n\
  *          = 'N':  Compute eigenvalues only;\n\
  *          = 'V':  Compute eigenvalues and eigenvectors.\n\
  *\n\
  *  N       (input) INTEGER\n\
  *          The order of the matrix.  N >= 0.\n\
  *\n\
  *  D       (input/output) REAL array, dimension (N)\n\
  *          On entry, the n diagonal elements of the tridiagonal matrix\n\
  *          A.\n\
  *          On exit, if INFO = 0, the eigenvalues in ascending order.\n\
  *\n\
  *  E       (input/output) REAL array, dimension (N-1)\n\
  *          On entry, the (n-1) subdiagonal elements of the tridiagonal\n\
  *          matrix A, stored in elements 1 to N-1 of E.\n\
  *          On exit, the contents of E are destroyed.\n\
  *\n\
  *  Z       (output) REAL array, dimension (LDZ, N)\n\
  *          If JOBZ = 'V', then if INFO = 0, Z contains the orthonormal\n\
  *          eigenvectors of the matrix A, with the i-th column of Z\n\
  *          holding the eigenvector associated with D(i).\n\
  *          If JOBZ = 'N', then Z is not referenced.\n\
  *\n\
  *  LDZ     (input) INTEGER\n\
  *          The leading dimension of the array Z.  LDZ >= 1, and if\n\
  *          JOBZ = 'V', LDZ >= max(1,N).\n\
  *\n\
  *  WORK    (workspace) REAL array, dimension (max(1,2*N-2))\n\
  *          If JOBZ = 'N', WORK is not referenced.\n\
  *\n\
  *  INFO    (output) INTEGER\n\
  *          = 0:  successful exit\n\
  *          < 0:  if INFO = -i, the i-th argument had an illegal value\n\
  *          > 0:  if INFO = i, the algorithm failed to converge; i\n\
  *                off-diagonal elements of E did not converge to zero.\n\
  *\n\n\
  *  =====================================================================\n\
  *\n"
