text: /* ../netlib/dptsv.f -- translated by f2c (version 20100827). You must link the resulting object file with libf2c: on Microsoft Windows system, link with libf2c.lib;
   on Linux or Unix systems, link with .../path/to/libf2c.a -lm or, if you install libf2c.a in a standard place, with -lf2c -lm -- in that order, at the end of the command line, as in cc *.o -lf2c -lm Source for libf2c is in /netlib/f2c/libf2c.zip, e.g., http://www.netlib.org/f2c/libf2c.zip */
  #include "FLA_f2c.h" /* > \brief <b> DPTSV computes the solution to system of linear equations A * X = B for PT matrices</b> */
  /* =========== DOCUMENTATION =========== */
  /* Online html documentation available at */
  /* http://www.netlib.org/lapack/explore-html/ */
  /* > \htmlonly */
  /* > Download DPTSV + dependencies */
  /* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dptsv.f "> */
  /* > [TGZ]</a> */
  /* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dptsv.f "> */
  /* > [ZIP]</a> */
  /* > <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dptsv.f "> */
  /* > [TXT]</a> */
  /* > \endhtmlonly */
  /* Definition: */
  /* =========== */
  /* SUBROUTINE DPTSV( N, NRHS, D, E, B, LDB, INFO ) */
  /* .. Scalar Arguments .. */
  /* INTEGER INFO, LDB, N, NRHS */
  /* .. */
  /* .. Array Arguments .. */
  /* DOUBLE PRECISION B( LDB, * ), D( * ), E( * ) */
  /* .. */
  /* > \par Purpose: */
  /* ============= */
  /* > */
  /* > \verbatim */
  /* > */
  /* > DPTSV computes the solution to a real system of linear equations */
  /* > A*X = B, where A is an N-by-N symmetric positive definite tridiagonal */
  /* > matrix, and X and B are N-by-NRHS matrices. */
  /* > */
  /* > A is factored as A = L*D*L**T, and the factored form of A is then */
  /* > used to solve the system of equations. */
  /* > \endverbatim */
  /* Arguments: */
  /* ========== */
  /* > \param[in] N */
  /* > \verbatim */
  /* > N is INTEGER */
  /* > The order of the matrix A. N >= 0. */
  /* > \endverbatim */
  /* > */
  /* > \param[in] NRHS */
  /* > \verbatim */
  /* > NRHS is INTEGER */
  /* > The number of right hand sides, i.e., the number of columns */
  /* > of the matrix B. NRHS >= 0. */
  /* > \endverbatim */
  /* > */
  /* > \param[in,out] D */
  /* > \verbatim */
  /* > D is DOUBLE PRECISION array, dimension (N) */
  /* > On entry, the n diagonal elements of the tridiagonal matrix */
  /* > A. On exit, the n diagonal elements of the diagonal matrix */
  /* > D from the factorization A = L*D*L**T. */
  /* > \endverbatim */
  /* > */
  /* > \param[in,out] E */
  /* > \verbatim */
  /* > E is DOUBLE PRECISION array, dimension (N-1) */
  /* > On entry, the (n-1) subdiagonal elements of the tridiagonal */
  /* > matrix A. On exit, the (n-1) subdiagonal elements of the */
  /* > unit bidiagonal factor L from the L*D*L**T factorization of */
  /* > A. (E can also be regarded as the superdiagonal of the unit */
  /* > bidiagonal factor U from the U**T*D*U factorization of A.) */
  /* > \endverbatim */
  /* > */
  /* > \param[in,out] B */
  /* > \verbatim */
  /* > B is DOUBLE PRECISION array, dimension (LDB,NRHS) */
  /* > On entry, the N-by-NRHS right hand side matrix B. */
  /* > On exit, if INFO = 0, the N-by-NRHS solution matrix X. */
  /* > \endverbatim */
  /* > */
  /* > \param[in] LDB */
  /* > \verbatim */
  /* > LDB is INTEGER */
  /* > The leading dimension of the array B. LDB >= max(1,N). */
  /* > \endverbatim */
  /* > */
  /* > \param[out] INFO */
  /* > \verbatim */
  /* > INFO is INTEGER */
  /* > = 0: successful exit */
  /* > < 0: if INFO = -i, the i-th argument had an illegal value */
  /* > > 0: if INFO = i, the leading minor of order i is not */
  /* > positive definite, and the solution has not been */
  /* > computed. The factorization has not been completed */
  /* > unless i = N. */
  /* > \endverbatim */
  /* Authors: */
  /* ======== */
  /* > \author Univ. of Tennessee */
  /* > \author Univ. of California Berkeley */
  /* > \author Univ. of Colorado Denver */
  /* > \author NAG Ltd. */
  /* > \date September 2012 */
  /* > \ingroup doublePTsolve */
  /* ===================================================================== */
  /* Subroutine */
  int dptsv_(integer *n, integer *nrhs, doublereal *d__, doublereal *e, doublereal *b, integer *ldb, integer *info)
  {
      /* System generated locals */
      integer b_dim1, b_offset, i__1;
      /* Local variables */
      extern /* Subroutine */
      int xerbla_(char *, integer *), dpttrf_( integer *, doublereal *, doublereal *, integer *), dpttrs_( integer *, integer *, doublereal *, doublereal *, doublereal *, integer *, integer *);
      /* -- LAPACK driver routine (version 3.4.2) -- */
      /* -- LAPACK is a software package provided by Univ. of Tennessee, -- */
      /* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- */
      /* September 2012 */
      /* .. Scalar Arguments .. */
      /* .. */
      /* .. Array Arguments .. */
      /* .. */
      /* ===================================================================== */
      /* .. External Subroutines .. */
      /* .. */
      /* .. Intrinsic Functions .. */
      /* .. */
      /* .. Executable Statements .. */
      /* Test the input parameters. */
      /* Parameter adjustments */
      --d__;
      --e;
      b_dim1 = *ldb;
      b_offset = 1 + b_dim1;
      b -= b_offset;
      /* Function Body */
      *info = 0;
      if (*n < 0)
      {
          *info = -1;
      }
      else if (*nrhs < 0)
      {
          *info = -2;
      }
      else if (*ldb < max(1,*n))
      {
          *info = -6;
      }
      if (*info != 0)
      {
          i__1 = -(*info);
          xerbla_("DPTSV ", &i__1);
          return 0;
      }
      /* Compute the L*D*L**T (or U**T*D*U) factorization of A. */
      dpttrf_(n, &d__[1], &e[1], info);
      if (*info == 0)
      {
          /* Solve the system A*X = B, overwriting B with X. */
          dpttrs_(n, nrhs, &d__[1], &e[1], &b[b_offset], ldb, info);
      }
      return 0;
      /* End of DPTSV */
  }
  /* dptsv_ */
  