File: dsytri2x

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--- 
:name: dsytri2x
:md5sum: 683ca7b4f920246786909d9f75b2ce4b
:category: :subroutine
:arguments: 
- uplo: 
    :type: char
    :intent: input
- n: 
    :type: integer
    :intent: input
- a: 
    :type: doublereal
    :intent: input/output
    :dims: 
    - lda
    - n
- lda: 
    :type: integer
    :intent: input
- ipiv: 
    :type: integer
    :intent: input
    :dims: 
    - n
- work: 
    :type: doublereal
    :intent: workspace
    :dims: 
    - n+nb+1
    - nb+3
- nb: 
    :type: integer
    :intent: input
- info: 
    :type: integer
    :intent: output
:substitutions: {}

:fortran_help: "      SUBROUTINE DSYTRI2X( UPLO, N, A, LDA, IPIV, WORK, NB, INFO )\n\n\
  *  Purpose\n\
  *  =======\n\
  *\n\
  *  DSYTRI2X computes the inverse of a real symmetric indefinite matrix\n\
  *  A using the factorization A = U*D*U**T or A = L*D*L**T computed by\n\
  *  DSYTRF.\n\
  *\n\n\
  *  Arguments\n\
  *  =========\n\
  *\n\
  *  UPLO    (input) CHARACTER*1\n\
  *          Specifies whether the details of the factorization are stored\n\
  *          as an upper or lower triangular matrix.\n\
  *          = 'U':  Upper triangular, form is A = U*D*U**T;\n\
  *          = 'L':  Lower triangular, form is A = L*D*L**T.\n\
  *\n\
  *  N       (input) INTEGER\n\
  *          The order of the matrix A.  N >= 0.\n\
  *\n\
  *  A       (input/output) DOUBLE PRECISION array, dimension (LDA,N)\n\
  *          On entry, the NNB diagonal matrix D and the multipliers\n\
  *          used to obtain the factor U or L as computed by DSYTRF.\n\
  *\n\
  *          On exit, if INFO = 0, the (symmetric) inverse of the original\n\
  *          matrix.  If UPLO = 'U', the upper triangular part of the\n\
  *          inverse is formed and the part of A below the diagonal is not\n\
  *          referenced; if UPLO = 'L' the lower triangular part of the\n\
  *          inverse is formed and the part of A above the diagonal is\n\
  *          not referenced.\n\
  *\n\
  *  LDA     (input) INTEGER\n\
  *          The leading dimension of the array A.  LDA >= max(1,N).\n\
  *\n\
  *  IPIV    (input) INTEGER array, dimension (N)\n\
  *          Details of the interchanges and the NNB structure of D\n\
  *          as determined by DSYTRF.\n\
  *\n\
  *  WORK    (workspace) DOUBLE PRECISION array, dimension (N+NNB+1,NNB+3)\n\
  *\n\
  *  NB      (input) INTEGER\n\
  *          Block size\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, D(i,i) = 0; the matrix is singular and its\n\
  *               inverse could not be computed.\n\
  *\n\n\
  *  =====================================================================\n\
  *\n"