derrtz.f

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*> \brief \b DERRTZ
*
*  =========== DOCUMENTATION ===========
*
* Online html documentation available at
*            http://www.netlib.org/lapack/explore-html/
*
*  Definition:
*  ===========
*
*       SUBROUTINE DERRTZ( PATH, NUNIT )
*
*       .. Scalar Arguments ..
*       CHARACTER*3        PATH
*       INTEGER            NUNIT
*       ..
*
*
*> \par Purpose:
*  =============
*>
*> \verbatim
*>
*> DERRTZ tests the error exits for STZRZF.
*> \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 derrtz( 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 ..
      CHARACTER*3        PATH
      INTEGER            NUNIT
*     ..
*
*  =====================================================================
*
*     .. Parameters ..
      INTEGER            NMAX
      parameter( nmax = 2 )
*     ..
*     .. Local Scalars ..
      CHARACTER*2        C2
      INTEGER            INFO
*     ..
*     .. Local Arrays ..
      DOUBLE PRECISION   A( NMAX, NMAX ), TAU( NMAX ), W( NMAX )
*     ..
*     .. External Functions ..
      LOGICAL            LSAMEN
      EXTERNAL           lsamen
*     ..
*     .. External Subroutines ..
      EXTERNAL           alaesm, chkxer, dtzrzf
*     ..
*     .. Scalars in Common ..
      LOGICAL            LERR, OK
      CHARACTER*32       SRNAMT
      INTEGER            INFOT, NOUT
*     ..
*     .. Common blocks ..
      COMMON             / infoc / infot, nout, ok, lerr
      COMMON             / srnamc / srnamt
*     ..
*     .. Executable Statements ..
*
      nout = nunit
      WRITE( nout, fmt = * )
      c2 = path( 2: 3 )
      a( 1, 1 ) = 1.d+0
      a( 1, 2 ) = 2.d+0
      a( 2, 2 ) = 3.d+0
      a( 2, 1 ) = 4.d+0
      w( 1 ) = 0.0d+0
      w( 2 ) = 0.0d+0
      ok = .true.
*
      IF( lsamen( 2, c2, 'TZ' ) ) THEN
*
*        Test error exits for the trapezoidal routines.
*
*        DTZRZF
*
         srnamt = 'DTZRZF'
         infot = 1
         CALL dtzrzf( -1, 0, a, 1, tau, w, 1, info )
         CALL chkxer( 'DTZRZF', infot, nout, lerr, ok )
         infot = 2
         CALL dtzrzf( 1, 0, a, 1, tau, w, 1, info )
         CALL chkxer( 'DTZRZF', infot, nout, lerr, ok )
         infot = 4
         CALL dtzrzf( 2, 2, a, 1, tau, w, 1, info )
         CALL chkxer( 'DTZRZF', infot, nout, lerr, ok )
         infot = 7
         CALL dtzrzf( 2, 2, a, 2, tau, w, 0, info )
         CALL chkxer( 'DTZRZF', infot, nout, lerr, ok )
         infot = 7
         CALL dtzrzf( 2, 3, a, 2, tau, w, 1, info )
         CALL chkxer( 'DTZRZF', infot, nout, lerr, ok )
      END IF
*
*     Print a summary line.
*
      CALL alaesm( path, ok, nout )
*
      RETURN
*
*     End of DERRTZ
*
      END