subroutine derrab

(

integer

NUNIT

)

DERRAB

Purpose:

 DERRAB tests the error exits for DSGESV.

Parameters

[in]

NUNIT

NUNIT is INTEGER The unit number for output.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date

November 2011

Definition at line 49 of file derrab.f.

*
*  -- 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 ..
      INTEGER            nunit
*     ..
*
*  =====================================================================
*
*     .. Parameters ..
      INTEGER            nmax
      parameter                ( nmax = 4 )
*     ..
*     .. Local Scalars ..
      INTEGER            i, info, iter, j
*     ..
*     .. Local Arrays ..
      INTEGER            ip( nmax )
      DOUBLE PRECISION   a( nmax, nmax ), af( nmax, nmax ), b( nmax ),
     $                   c( nmax ), r( nmax ), r1( nmax ), r2( nmax ),
     $                   w( 2*nmax ), x( nmax )
      DOUBLE PRECISION   work(1)
      REAL               swork(1)
*     ..
*     .. External Subroutines ..
      EXTERNAL           chkxer, dsgesv
*     ..
*     .. Scalars in Common ..
      LOGICAL            lerr, ok
      CHARACTER*32       srnamt
      INTEGER            infot, nout
*     ..
*     .. 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 20 j = 1, nmax
         DO 10 i = 1, nmax
            a( i, j ) = 1.d0 / dble( i+j )
            af( i, j ) = 1.d0 / dble( i+j )
   10    CONTINUE
         b( j ) = 0.d0
         r1( j ) = 0.d0
         r2( j ) = 0.d0
         w( j ) = 0.d0
         x( j ) = 0.d0
         c( j ) = 0.d0
         r( j ) = 0.d0
         ip( j ) = j
   20 CONTINUE
      ok = .true.
*
      srnamt = 'DSGESV'
      infot = 1
      CALL dsgesv(-1,0,a,1,ip,b,1,x,1,work,swork,iter,info)
      CALL chkxer( 'DSGESV', infot, nout, lerr, ok )
      infot = 2
      CALL dsgesv(0,-1,a,1,ip,b,1,x,1,work,swork,iter,info)
      CALL chkxer( 'DSGESV', infot, nout, lerr, ok )
      infot = 4
      CALL dsgesv(2,1,a,1,ip,b,2,x,2,work,swork,iter,info)
      CALL chkxer( 'DSGESV', infot, nout, lerr, ok )
      infot = 7
      CALL dsgesv(2,1,a,2,ip,b,1,x,2,work,swork,iter,info)
      CALL chkxer( 'DSGESV', infot, nout, lerr, ok )
      infot = 9
      CALL dsgesv(2,1,a,2,ip,b,2,x,1,work,swork,iter,info)
      CALL chkxer( 'DSGESV', infot, nout, lerr, ok )
*
*     Print a summary line.
*
      IF( ok ) THEN
         WRITE( nout, fmt = 9999 )'DSGESV'
      ELSE
         WRITE( nout, fmt = 9998 )'DSGESV'
      END IF
*
 9999 FORMAT( 1x, a6, ' drivers passed the tests of the error exits' )
 9998 FORMAT( ' *** ', a6, ' drivers failed the tests of the error ',
     $      'exits ***' )
*
      RETURN
*
*     End of DERRAB
*

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