LAPACK  3.8.0
LAPACK: Linear Algebra PACKage
derrab.f
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1 *> \brief \b DERRAB
2 *
3 * =========== DOCUMENTATION ===========
4 *
5 * Online html documentation available at
6 * http://www.netlib.org/lapack/explore-html/
7 *
8 * Definition:
9 * ===========
10 *
11 * SUBROUTINE DERRAB( NUNIT )
12 *
13 * .. Scalar Arguments ..
14 * INTEGER NUNIT
15 * ..
16 *
17 *
18 *> \par Purpose:
19 * =============
20 *>
21 *> \verbatim
22 *>
23 *> DERRAB tests the error exits for DSGESV.
24 *> \endverbatim
25 *
26 * Arguments:
27 * ==========
28 *
29 *> \param[in] NUNIT
30 *> \verbatim
31 *> NUNIT is INTEGER
32 *> The unit number for output.
33 *> \endverbatim
34 *
35 * Authors:
36 * ========
37 *
38 *> \author Univ. of Tennessee
39 *> \author Univ. of California Berkeley
40 *> \author Univ. of Colorado Denver
41 *> \author NAG Ltd.
42 *
43 *> \date December 2016
44 *
45 *> \ingroup double_lin
46 *
47 * =====================================================================
48  SUBROUTINE derrab( NUNIT )
49 *
50 * -- LAPACK test routine (version 3.7.0) --
51 * -- LAPACK is a software package provided by Univ. of Tennessee, --
52 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
53 * December 2016
54 *
55 * .. Scalar Arguments ..
56  INTEGER NUNIT
57 * ..
58 *
59 * =====================================================================
60 *
61 * .. Parameters ..
62  INTEGER NMAX
63  parameter( nmax = 4 )
64 * ..
65 * .. Local Scalars ..
66  INTEGER I, INFO, ITER, J
67 * ..
68 * .. Local Arrays ..
69  INTEGER IP( nmax )
70  DOUBLE PRECISION A( nmax, nmax ), AF( nmax, nmax ), B( nmax ),
71  $ c( nmax ), r( nmax ), r1( nmax ), r2( nmax ),
72  $ w( 2*nmax ), x( nmax )
73  DOUBLE PRECISION WORK(1)
74  REAL SWORK(1)
75 * ..
76 * .. External Subroutines ..
77  EXTERNAL chkxer, dsgesv
78 * ..
79 * .. Scalars in Common ..
80  LOGICAL LERR, OK
81  CHARACTER*32 SRNAMT
82  INTEGER INFOT, NOUT
83 * ..
84 * .. Common blocks ..
85  COMMON / infoc / infot, nout, ok, lerr
86  COMMON / srnamc / srnamt
87 * ..
88 * .. Intrinsic Functions ..
89  INTRINSIC dble
90 * ..
91 * .. Executable Statements ..
92 *
93  nout = nunit
94  WRITE( nout, fmt = * )
95 *
96 * Set the variables to innocuous values.
97 *
98  DO 20 j = 1, nmax
99  DO 10 i = 1, nmax
100  a( i, j ) = 1.d0 / dble( i+j )
101  af( i, j ) = 1.d0 / dble( i+j )
102  10 CONTINUE
103  b( j ) = 0.d0
104  r1( j ) = 0.d0
105  r2( j ) = 0.d0
106  w( j ) = 0.d0
107  x( j ) = 0.d0
108  c( j ) = 0.d0
109  r( j ) = 0.d0
110  ip( j ) = j
111  20 CONTINUE
112  ok = .true.
113 *
114  srnamt = 'DSGESV'
115  infot = 1
116  CALL dsgesv(-1,0,a,1,ip,b,1,x,1,work,swork,iter,info)
117  CALL chkxer( 'DSGESV', infot, nout, lerr, ok )
118  infot = 2
119  CALL dsgesv(0,-1,a,1,ip,b,1,x,1,work,swork,iter,info)
120  CALL chkxer( 'DSGESV', infot, nout, lerr, ok )
121  infot = 4
122  CALL dsgesv(2,1,a,1,ip,b,2,x,2,work,swork,iter,info)
123  CALL chkxer( 'DSGESV', infot, nout, lerr, ok )
124  infot = 7
125  CALL dsgesv(2,1,a,2,ip,b,1,x,2,work,swork,iter,info)
126  CALL chkxer( 'DSGESV', infot, nout, lerr, ok )
127  infot = 9
128  CALL dsgesv(2,1,a,2,ip,b,2,x,1,work,swork,iter,info)
129  CALL chkxer( 'DSGESV', infot, nout, lerr, ok )
130 *
131 * Print a summary line.
132 *
133  IF( ok ) THEN
134  WRITE( nout, fmt = 9999 )'DSGESV'
135  ELSE
136  WRITE( nout, fmt = 9998 )'DSGESV'
137  END IF
138 *
139  9999 FORMAT( 1x, a6, ' drivers passed the tests of the error exits' )
140  9998 FORMAT( ' *** ', a6, ' drivers failed the tests of the error ',
141  $ 'exits ***' )
142 *
143  RETURN
144 *
145 * End of DERRAB
146 *
147  END
subroutine dsgesv(N, NRHS, A, LDA, IPIV, B, LDB, X, LDX, WORK, SWORK, ITER, INFO)
DSGESV computes the solution to system of linear equations A * X = B for GE matrices (mixed precisio...
Definition: dsgesv.f:197
subroutine chkxer(SRNAMT, INFOT, NOUT, LERR, OK)
Definition: cblat2.f:3199
subroutine derrab(NUNIT)
DERRAB
Definition: derrab.f:49