3 * =========== DOCUMENTATION ===========
5 * Online html documentation available at
6 * http://www.netlib.org/lapack/explore-html/
11 * SUBROUTINE CGET35( RMAX, LMAX, NINFO, KNT, NIN )
13 * .. Scalar Arguments ..
14 * INTEGER KNT, LMAX, NIN, NINFO
24 *> CGET35 tests CTRSYL, a routine for solving the Sylvester matrix
27 *> op(A)*X + ISGN*X*op(B) = scale*C,
29 *> A and B are assumed to be in Schur canonical form, op() represents an
30 *> optional transpose, and ISGN can be -1 or +1. Scale is an output
31 *> less than or equal to 1, chosen to avoid overflow in X.
33 *> The test code verifies that the following residual is order 1:
35 *> norm(op(A)*X + ISGN*X*op(B) - scale*C) /
36 *> (EPS*max(norm(A),norm(B))*norm(X))
45 *> Value of the largest test ratio.
51 *> Example number where largest test ratio achieved.
57 *> Number of examples where INFO is nonzero.
63 *> Total number of examples tested.
69 *> Input logical unit number.
75 *> \author Univ. of Tennessee
76 *> \author Univ. of California Berkeley
77 *> \author Univ. of Colorado Denver
80 *> \date November 2011
82 *> \ingroup complex_eig
84 * =====================================================================
85 SUBROUTINE CGET35( RMAX, LMAX, NINFO, KNT, NIN )
87 * -- LAPACK test routine (version 3.4.0) --
88 * -- LAPACK is a software package provided by Univ. of Tennessee, --
89 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
92 * .. Scalar Arguments ..
93 INTEGER KNT, LMAX, NIN, NINFO
97 * =====================================================================
101 PARAMETER ( LDT = 10 )
103 PARAMETER ( ZERO = 0.0E0, ONE = 1.0E0, TWO = 2.0E0 )
105 PARAMETER ( LARGE = 1.0E6 )
107 PARAMETER ( CONE = 1.0E0 )
109 * .. Local Scalars ..
110 CHARACTER TRANA, TRANB
111 INTEGER I, IMLA, IMLAD, IMLB, IMLC, INFO, ISGN, ITRANA,
113 REAL BIGNUM, EPS, RES, RES1, SCALE, SMLNUM, TNRM,
118 REAL DUM( 1 ), VM1( 3 ), VM2( 3 )
119 COMPLEX A( LDT, LDT ), ATMP( LDT, LDT ), B( LDT, LDT ),
120 $ BTMP( LDT, LDT ), C( LDT, LDT ),
121 $ CSAV( LDT, LDT ), CTMP( LDT, LDT )
123 * .. External Functions ..
125 EXTERNAL CLANGE, SLAMCH
127 * .. External Subroutines ..
128 EXTERNAL CGEMM, CTRSYL
130 * .. Intrinsic Functions ..
131 INTRINSIC ABS, MAX, REAL, SQRT
133 * .. Executable Statements ..
135 * Get machine parameters
138 SMLNUM = SLAMCH( 'S' ) / EPS
139 BIGNUM = ONE / SMLNUM
140 CALL SLABAD( SMLNUM, BIGNUM )
142 * Set up test case parameters
144 VM1( 1 ) = SQRT( SMLNUM )
148 VM2( 2 ) = ONE + TWO*EPS
159 READ( NIN, FMT = * )M, N
163 READ( NIN, FMT = * )( ATMP( I, J ), J = 1, M )
166 READ( NIN, FMT = * )( BTMP( I, J ), J = 1, N )
169 READ( NIN, FMT = * )( CTMP( I, J ), J = 1, N )
177 DO 110 ISGN = -1, 1, 2
189 A( I, J ) = ATMP( I, J )*VM1( IMLA )
190 TNRM = MAX( TNRM, ABS( A( I, J ) ) )
192 A( I, I ) = A( I, I )*VM2( IMLAD )
193 TNRM = MAX( TNRM, ABS( A( I, I ) ) )
197 B( I, J ) = BTMP( I, J )*VM1( IMLB )
198 TNRM = MAX( TNRM, ABS( B( I, J ) ) )
205 C( I, J ) = CTMP( I, J )*VM1( IMLC )
206 CSAV( I, J ) = C( I, J )
210 CALL CTRSYL( TRANA, TRANB, ISGN, M, N, A,
211 $ LDT, B, LDT, C, LDT, SCALE,
215 XNRM = CLANGE( 'M', M, N, C, LDT, DUM )
217 IF( XNRM.GT.ONE .AND. TNRM.GT.ONE ) THEN
218 IF( XNRM.GT.BIGNUM / TNRM ) THEN
219 RMUL = MAX( XNRM, TNRM )
223 CALL CGEMM( TRANA, 'N', M, N, M, RMUL, A,
224 $ LDT, C, LDT, -SCALE*RMUL, CSAV,
226 CALL CGEMM( 'N', TRANB, M, N, N,
227 $ REAL( ISGN )*RMUL, C, LDT, B,
228 $ LDT, CONE, CSAV, LDT )
229 RES1 = CLANGE( 'M', M, N, CSAV, LDT, DUM )
230 RES = RES1 / MAX( SMLNUM, SMLNUM*XNRM,
231 $ ( ( ABS( RMUL )*TNRM )*EPS )*XNRM )
232 IF( RES.GT.RMAX ) THEN