schktb.f

来自「famous linear algebra library (LAPACK) p」· F 代码 · 共 488 行 · 第 1/2 页

                  IF( ANORM.LE.ZERO .OR. AINVNM.LE.ZERO ) THEN
                     RCONDI = ONE
                  ELSE
                     RCONDI = ( ONE / ANORM ) / AINVNM
                  END IF
*
                  DO 60 IRHS = 1, NNS
                     NRHS = NSVAL( IRHS )
                     XTYPE = 'N'
*
                     DO 50 ITRAN = 1, NTRAN
*
*                    Do for op(A) = A, A**T, or A**H.
*
                        TRANS = TRANSS( ITRAN )
                        IF( ITRAN.EQ.1 ) THEN
                           NORM = 'O'
                           RCONDC = RCONDO
                        ELSE
                           NORM = 'I'
                           RCONDC = RCONDI
                        END IF
*
*+    TEST 1
*                    Solve and compute residual for op(A)*x = b.
*
                        SRNAMT = 'SLARHS'
                        CALL SLARHS( PATH, XTYPE, UPLO, TRANS, N, N, KD,
     $                               IDIAG, NRHS, AB, LDAB, XACT, LDA,
     $                               B, LDA, ISEED, INFO )
                        XTYPE = 'C'
                        CALL SLACPY( 'Full', N, NRHS, B, LDA, X, LDA )
*
                        SRNAMT = 'STBTRS'
                        CALL STBTRS( UPLO, TRANS, DIAG, N, KD, NRHS, AB,
     $                               LDAB, X, LDA, INFO )
*
*                    Check error code from STBTRS.
*
                        IF( INFO.NE.0 )
     $                     CALL ALAERH( PATH, 'STBTRS', INFO, 0,
     $                                  UPLO // TRANS // DIAG, N, N, KD,
     $                                  KD, NRHS, IMAT, NFAIL, NERRS,
     $                                  NOUT )
*
                        CALL STBT02( UPLO, TRANS, DIAG, N, KD, NRHS, AB,
     $                               LDAB, X, LDA, B, LDA, WORK,
     $                               RESULT( 1 ) )
*
*+    TEST 2
*                    Check solution from generated exact solution.
*
                        CALL SGET04( N, NRHS, X, LDA, XACT, LDA, RCONDC,
     $                               RESULT( 2 ) )
*
*+    TESTS 3, 4, and 5
*                    Use iterative refinement to improve the solution
*                    and compute error bounds.
*
                        SRNAMT = 'STBRFS'
                        CALL STBRFS( UPLO, TRANS, DIAG, N, KD, NRHS, AB,
     $                               LDAB, B, LDA, X, LDA, RWORK,
     $                               RWORK( NRHS+1 ), WORK, IWORK,
     $                               INFO )
*
*                    Check error code from STBRFS.
*
                        IF( INFO.NE.0 )
     $                     CALL ALAERH( PATH, 'STBRFS', INFO, 0,
     $                                  UPLO // TRANS // DIAG, N, N, KD,
     $                                  KD, NRHS, IMAT, NFAIL, NERRS,
     $                                  NOUT )
*
                        CALL SGET04( N, NRHS, X, LDA, XACT, LDA, RCONDC,
     $                               RESULT( 3 ) )
                        CALL STBT05( UPLO, TRANS, DIAG, N, KD, NRHS, AB,
     $                               LDAB, B, LDA, X, LDA, XACT, LDA,
     $                               RWORK, RWORK( NRHS+1 ),
     $                               RESULT( 4 ) )
*
*                       Print information about the tests that did not
*                       pass the threshold.
*
                        DO 40 K = 1, 5
                           IF( RESULT( K ).GE.THRESH ) THEN
                              IF( NFAIL.EQ.0 .AND. NERRS.EQ.0 )
     $                           CALL ALAHD( NOUT, PATH )
                              WRITE( NOUT, FMT = 9999 )UPLO, TRANS,
     $                           DIAG, N, KD, NRHS, IMAT, K, RESULT( K )
                              NFAIL = NFAIL + 1
                           END IF
   40                   CONTINUE
                        NRUN = NRUN + 5
   50                CONTINUE
   60             CONTINUE
*
*+    TEST 6
*                    Get an estimate of RCOND = 1/CNDNUM.
*
                  DO 70 ITRAN = 1, 2
                     IF( ITRAN.EQ.1 ) THEN
                        NORM = 'O'
                        RCONDC = RCONDO
                     ELSE
                        NORM = 'I'
                        RCONDC = RCONDI
                     END IF
                     SRNAMT = 'STBCON'
                     CALL STBCON( NORM, UPLO, DIAG, N, KD, AB, LDAB,
     $                            RCOND, WORK, IWORK, INFO )
*
*                    Check error code from STBCON.
*
                     IF( INFO.NE.0 )
     $                  CALL ALAERH( PATH, 'STBCON', INFO, 0,
     $                               NORM // UPLO // DIAG, N, N, KD, KD,
     $                               -1, IMAT, NFAIL, NERRS, NOUT )
*
                     CALL STBT06( RCOND, RCONDC, UPLO, DIAG, N, KD, AB,
     $                            LDAB, RWORK, RESULT( 6 ) )
*
*                    Print information about the tests that did not pass
*                    the threshold.
*
                     IF( RESULT( 6 ).GE.THRESH ) THEN
                        IF( NFAIL.EQ.0 .AND. NERRS.EQ.0 )
     $                     CALL ALAHD( NOUT, PATH )
                        WRITE( NOUT, FMT = 9998 ) 'STBCON', NORM, UPLO,
     $                     DIAG, N, KD, IMAT, 6, RESULT( 6 )
                        NFAIL = NFAIL + 1
                     END IF
                     NRUN = NRUN + 1
   70             CONTINUE
   80          CONTINUE
   90       CONTINUE
*
*           Use pathological test matrices to test SLATBS.
*
            DO 120 IMAT = NTYPE1 + 1, NIMAT2
*
*              Do the tests only if DOTYPE( IMAT ) is true.
*
               IF( .NOT.DOTYPE( IMAT ) )
     $            GO TO 120
*
               DO 110 IUPLO = 1, 2
*
*                 Do first for UPLO = 'U', then for UPLO = 'L'
*
                  UPLO = UPLOS( IUPLO )
                  DO 100 ITRAN = 1, NTRAN
*
*                    Do for op(A) = A, A**T, and A**H.
*
                     TRANS = TRANSS( ITRAN )
*
*                    Call SLATTB to generate a triangular test matrix.
*
                     SRNAMT = 'SLATTB'
                     CALL SLATTB( IMAT, UPLO, TRANS, DIAG, ISEED, N, KD,
     $                            AB, LDAB, X, WORK, INFO )
*
*+    TEST 7
*                    Solve the system op(A)*x = b
*
                     SRNAMT = 'SLATBS'
                     CALL SCOPY( N, X, 1, B, 1 )
                     CALL SLATBS( UPLO, TRANS, DIAG, 'N', N, KD, AB,
     $                            LDAB, B, SCALE, RWORK, INFO )
*
*                    Check error code from SLATBS.
*
                     IF( INFO.NE.0 )
     $                  CALL ALAERH( PATH, 'SLATBS', INFO, 0,
     $                               UPLO // TRANS // DIAG // 'N', N, N,
     $                               KD, KD, -1, IMAT, NFAIL, NERRS,
     $                               NOUT )
*
                     CALL STBT03( UPLO, TRANS, DIAG, N, KD, 1, AB, LDAB,
     $                            SCALE, RWORK, ONE, B, LDA, X, LDA,
     $                            WORK, RESULT( 7 ) )
*
*+    TEST 8
*                    Solve op(A)*x = b again with NORMIN = 'Y'.
*
                     CALL SCOPY( N, X, 1, B, 1 )
                     CALL SLATBS( UPLO, TRANS, DIAG, 'Y', N, KD, AB,
     $                            LDAB, B, SCALE, RWORK, INFO )
*
*                    Check error code from SLATBS.
*
                     IF( INFO.NE.0 )
     $                  CALL ALAERH( PATH, 'SLATBS', INFO, 0,
     $                               UPLO // TRANS // DIAG // 'Y', N, N,
     $                               KD, KD, -1, IMAT, NFAIL, NERRS,
     $                               NOUT )
*
                     CALL STBT03( UPLO, TRANS, DIAG, N, KD, 1, AB, LDAB,
     $                            SCALE, RWORK, ONE, B, LDA, X, LDA,
     $                            WORK, RESULT( 8 ) )
*
*                    Print information about the tests that did not pass
*                    the threshold.
*
                     IF( RESULT( 7 ).GE.THRESH ) THEN
                        IF( NFAIL.EQ.0 .AND. NERRS.EQ.0 )
     $                     CALL ALAHD( NOUT, PATH )
                        WRITE( NOUT, FMT = 9997 )'SLATBS', UPLO, TRANS,
     $                     DIAG, 'N', N, KD, IMAT, 7, RESULT( 7 )
                        NFAIL = NFAIL + 1
                     END IF
                     IF( RESULT( 8 ).GE.THRESH ) THEN
                        IF( NFAIL.EQ.0 .AND. NERRS.EQ.0 )
     $                     CALL ALAHD( NOUT, PATH )
                        WRITE( NOUT, FMT = 9997 )'SLATBS', UPLO, TRANS,
     $                     DIAG, 'Y', N, KD, IMAT, 8, RESULT( 8 )
                        NFAIL = NFAIL + 1
                     END IF
                     NRUN = NRUN + 2
  100             CONTINUE
  110          CONTINUE
  120       CONTINUE
  130    CONTINUE
  140 CONTINUE
*
*     Print a summary of the results.
*
      CALL ALASUM( PATH, NOUT, NFAIL, NRUN, NERRS )
*
 9999 FORMAT( ' UPLO=''', A1, ''', TRANS=''', A1, ''',
     $      DIAG=''', A1, ''', N=', I5, ', KD=', I5, ', NRHS=', I5,
     $      ', type ', I2, ', test(', I2, ')=', G12.5 )
 9998 FORMAT( 1X, A6, '( ''', A1, ''', ''', A1, ''', ''', A1, ''',',
     $      I5, ',', I5, ',  ... ), type ', I2, ', test(', I2, ')=',
     $      G12.5 )
 9997 FORMAT( 1X, A6, '( ''', A1, ''', ''', A1, ''', ''', A1, ''', ''',
     $      A1, ''',', I5, ',', I5, ', ...  ),  type ', I2, ', test(',
     $      I1, ')=', G12.5 )
      RETURN
*
*     End of SCHKTB
*
      END