derrps.f

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*> \brief \b DERRPS
*
*  =========== DOCUMENTATION ===========
*
* Online html documentation available at
*            http://www.netlib.org/lapack/explore-html/
*
*  Definition:
*  ===========
*
*       SUBROUTINE DERRPS( PATH, NUNIT )
*
*       .. Scalar Arguments ..
*       INTEGER            NUNIT
*       CHARACTER*3        PATH
*       ..
*
*
*> \par Purpose:
*  =============
*>
*> \verbatim
*>
*> DERRPS tests the error exits for the DOUBLE PRECISION routines
*> for DPSTRF.
*> \endverbatim
*
*  Arguments:
*  ==========
*
*> \param[in] PATH
*> \verbatim
*>          PATH is CHARACTER*3
*>          The LAPACK path name for the routines to be tested.
*> \endverbatim
*>
*> \param[in] NUNIT
*> \verbatim
*>          NUNIT is INTEGER
*>          The unit number for output.
*> \endverbatim
*
*  Authors:
*  ========
*
*> \author Univ. of Tennessee
*> \author Univ. of California Berkeley
*> \author Univ. of Colorado Denver
*> \author NAG Ltd.
*
*> \ingroup double_lin
*
*  =====================================================================
      SUBROUTINE derrps( PATH, NUNIT )
*
*  -- LAPACK test routine --
*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*
*     .. Scalar Arguments ..
      INTEGER            NUNIT
      CHARACTER*3        PATH
*     ..
*
*  =====================================================================
*
*     .. Parameters ..
      INTEGER            NMAX
      parameter( nmax = 4 )
*     ..
*     .. Local Scalars ..
      INTEGER            I, INFO, J, RANK
*     ..
*     .. Local Arrays ..
      DOUBLE PRECISION   A( NMAX, NMAX ), WORK( 2*NMAX )
      INTEGER            PIV( NMAX )
*     ..
*     .. External Subroutines ..
      EXTERNAL           alaesm, chkxer, dpstf2, dpstrf
*     ..
*     .. Scalars in Common ..
      INTEGER            INFOT, NOUT
      LOGICAL            LERR, OK
      CHARACTER*32       SRNAMT
*     ..
*     .. Common blocks ..
      COMMON             / infoc / infot, nout, ok, lerr
      COMMON             / srnamc / srnamt
*     ..
*     .. Intrinsic Functions ..
      INTRINSIC          dble
*     ..
*     .. Executable Statements ..
*
      nout = nunit
      WRITE( nout, fmt = * )
*
*     Set the variables to innocuous values.
*
      DO 110 j = 1, nmax
         DO 100 i = 1, nmax
            a( i, j ) = 1.d0 / dble( i+j )
*
  100    CONTINUE
         piv( j ) = j
         work( j ) = 0.d0
         work( nmax+j ) = 0.d0
*
  110 CONTINUE
      ok = .true.
*
*
*        Test error exits of the routines that use the Cholesky
*        decomposition of a symmetric positive semidefinite matrix.
*
*        DPSTRF
*
      srnamt = 'DPSTRF'
      infot = 1
      CALL dpstrf( '/', 0, a, 1, piv, rank, -1.d0, work, info )
      CALL chkxer( 'DPSTRF', infot, nout, lerr, ok )
      infot = 2
      CALL dpstrf( 'U', -1, a, 1, piv, rank, -1.d0, work, info )
      CALL chkxer( 'DPSTRF', infot, nout, lerr, ok )
      infot = 4
      CALL dpstrf( 'U', 2, a, 1, piv, rank, -1.d0, work, info )
      CALL chkxer( 'DPSTRF', infot, nout, lerr, ok )
*
*        DPSTF2
*
      srnamt = 'DPSTF2'
      infot = 1
      CALL dpstf2( '/', 0, a, 1, piv, rank, -1.d0, work, info )
      CALL chkxer( 'DPSTF2', infot, nout, lerr, ok )
      infot = 2
      CALL dpstf2( 'U', -1, a, 1, piv, rank, -1.d0, work, info )
      CALL chkxer( 'DPSTF2', infot, nout, lerr, ok )
      infot = 4
      CALL dpstf2( 'U', 2, a, 1, piv, rank, -1.d0, work, info )
      CALL chkxer( 'DPSTF2', infot, nout, lerr, ok )
*
*
*     Print a summary line.
*
      CALL alaesm( path, ok, nout )
*
      RETURN
*
*     End of DERRPS
*
      END