serrgt.f

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*> \brief \b SERRGT
*
*  =========== DOCUMENTATION ===========
*
* Online html documentation available at 
*            http://www.netlib.org/lapack/explore-html/ 
*
*  Definition:
*  ===========
*
*       SUBROUTINE SERRGT( PATH, NUNIT )
* 
*       .. Scalar Arguments ..
*       CHARACTER*3        PATH
*       INTEGER            NUNIT
*       ..
*  
*
*> \par Purpose:
*  =============
*>
*> \verbatim
*>
*> SERRGT tests the error exits for the REAL tridiagonal
*> routines.
*> \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. 
*
*> \date November 2011
*
*> \ingroup single_lin
*
*  =====================================================================
      SUBROUTINE serrgt( PATH, NUNIT )
*
*  -- LAPACK test routine (version 3.4.0) --
*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*     November 2011
*
*     .. Scalar Arguments ..
      CHARACTER*3        PATH
      INTEGER            NUNIT
*     ..
*
*  =====================================================================
*
*     .. Parameters ..
      INTEGER            NMAX
      parameter                ( nmax = 2 )
*     ..
*     .. Local Scalars ..
      CHARACTER*2        C2
      INTEGER            INFO
      REAL               ANORM, RCOND
*     ..
*     .. Local Arrays ..
      INTEGER            IP( nmax ), IW( nmax )
      REAL               B( nmax ), C( nmax ), CF( nmax ), D( nmax ),
     $                   df( nmax ), e( nmax ), ef( nmax ), f( nmax ),
     $                   r1( nmax ), r2( nmax ), w( nmax ), x( nmax )
*     ..
*     .. External Functions ..
      LOGICAL            LSAMEN
      EXTERNAL           lsamen
*     ..
*     .. External Subroutines ..
      EXTERNAL           alaesm, chkxer, sgtcon, sgtrfs, sgttrf, sgttrs,
     $                   sptcon, sptrfs, spttrf, spttrs
*     ..
*     .. 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 )
      d( 1 ) = 1.
      d( 2 ) = 2.
      df( 1 ) = 1.
      df( 2 ) = 2.
      e( 1 ) = 3.
      e( 2 ) = 4.
      ef( 1 ) = 3.
      ef( 2 ) = 4.
      anorm = 1.0
      ok = .true.
*
      IF( lsamen( 2, c2, 'GT' ) ) THEN
*
*        Test error exits for the general tridiagonal routines.
*
*        SGTTRF
*
         srnamt = 'SGTTRF'
         infot = 1
         CALL sgttrf( -1, c, d, e, f, ip, info )
         CALL chkxer( 'SGTTRF', infot, nout, lerr, ok )
*
*        SGTTRS
*
         srnamt = 'SGTTRS'
         infot = 1
         CALL sgttrs( '/', 0, 0, c, d, e, f, ip, x, 1, info )
         CALL chkxer( 'SGTTRS', infot, nout, lerr, ok )
         infot = 2
         CALL sgttrs( 'N', -1, 0, c, d, e, f, ip, x, 1, info )
         CALL chkxer( 'SGTTRS', infot, nout, lerr, ok )
         infot = 3
         CALL sgttrs( 'N', 0, -1, c, d, e, f, ip, x, 1, info )
         CALL chkxer( 'SGTTRS', infot, nout, lerr, ok )
         infot = 10
         CALL sgttrs( 'N', 2, 1, c, d, e, f, ip, x, 1, info )
         CALL chkxer( 'SGTTRS', infot, nout, lerr, ok )
*
*        SGTRFS
*
         srnamt = 'SGTRFS'
         infot = 1
         CALL sgtrfs( '/', 0, 0, c, d, e, cf, df, ef, f, ip, b, 1, x, 1,
     $                r1, r2, w, iw, info )
         CALL chkxer( 'SGTRFS', infot, nout, lerr, ok )
         infot = 2
         CALL sgtrfs( 'N', -1, 0, c, d, e, cf, df, ef, f, ip, b, 1, x,
     $                1, r1, r2, w, iw, info )
         CALL chkxer( 'SGTRFS', infot, nout, lerr, ok )
         infot = 3
         CALL sgtrfs( 'N', 0, -1, c, d, e, cf, df, ef, f, ip, b, 1, x,
     $                1, r1, r2, w, iw, info )
         CALL chkxer( 'SGTRFS', infot, nout, lerr, ok )
         infot = 13
         CALL sgtrfs( 'N', 2, 1, c, d, e, cf, df, ef, f, ip, b, 1, x, 2,
     $                r1, r2, w, iw, info )
         CALL chkxer( 'SGTRFS', infot, nout, lerr, ok )
         infot = 15
         CALL sgtrfs( 'N', 2, 1, c, d, e, cf, df, ef, f, ip, b, 2, x, 1,
     $                r1, r2, w, iw, info )
         CALL chkxer( 'SGTRFS', infot, nout, lerr, ok )
*
*        SGTCON
*
         srnamt = 'SGTCON'
         infot = 1
         CALL sgtcon( '/', 0, c, d, e, f, ip, anorm, rcond, w, iw,
     $                info )
         CALL chkxer( 'SGTCON', infot, nout, lerr, ok )
         infot = 2
         CALL sgtcon( 'I', -1, c, d, e, f, ip, anorm, rcond, w, iw,
     $                info )
         CALL chkxer( 'SGTCON', infot, nout, lerr, ok )
         infot = 8
         CALL sgtcon( 'I', 0, c, d, e, f, ip, -anorm, rcond, w, iw,
     $                info )
         CALL chkxer( 'SGTCON', infot, nout, lerr, ok )
*
      ELSE IF( lsamen( 2, c2, 'PT' ) ) THEN
*
*        Test error exits for the positive definite tridiagonal
*        routines.
*
*        SPTTRF
*
         srnamt = 'SPTTRF'
         infot = 1
         CALL spttrf( -1, d, e, info )
         CALL chkxer( 'SPTTRF', infot, nout, lerr, ok )
*
*        SPTTRS
*
         srnamt = 'SPTTRS'
         infot = 1
         CALL spttrs( -1, 0, d, e, x, 1, info )
         CALL chkxer( 'SPTTRS', infot, nout, lerr, ok )
         infot = 2
         CALL spttrs( 0, -1, d, e, x, 1, info )
         CALL chkxer( 'SPTTRS', infot, nout, lerr, ok )
         infot = 6
         CALL spttrs( 2, 1, d, e, x, 1, info )
         CALL chkxer( 'SPTTRS', infot, nout, lerr, ok )
*
*        SPTRFS
*
         srnamt = 'SPTRFS'
         infot = 1
         CALL sptrfs( -1, 0, d, e, df, ef, b, 1, x, 1, r1, r2, w, info )
         CALL chkxer( 'SPTRFS', infot, nout, lerr, ok )
         infot = 2
         CALL sptrfs( 0, -1, d, e, df, ef, b, 1, x, 1, r1, r2, w, info )
         CALL chkxer( 'SPTRFS', infot, nout, lerr, ok )
         infot = 8
         CALL sptrfs( 2, 1, d, e, df, ef, b, 1, x, 2, r1, r2, w, info )
         CALL chkxer( 'SPTRFS', infot, nout, lerr, ok )
         infot = 10
         CALL sptrfs( 2, 1, d, e, df, ef, b, 2, x, 1, r1, r2, w, info )
         CALL chkxer( 'SPTRFS', infot, nout, lerr, ok )
*
*        SPTCON
*
         srnamt = 'SPTCON'
         infot = 1
         CALL sptcon( -1, d, e, anorm, rcond, w, info )
         CALL chkxer( 'SPTCON', infot, nout, lerr, ok )
         infot = 4
         CALL sptcon( 0, d, e, -anorm, rcond, w, info )
         CALL chkxer( 'SPTCON', infot, nout, lerr, ok )
      END IF
*
*     Print a summary line.
*
      CALL alaesm( path, ok, nout )
*
      RETURN
*
*     End of SERRGT
*
      END