schktr.f

来自「famous linear algebra library (LAPACK) p」· F 代码 · 共 486 行 · 第 1/2 页

*
                  IF( INB.NE.1 )
     $               GO TO 60
*
                  DO 40 IRHS = 1, NNS
                     NRHS = NSVAL( IRHS )
                     XTYPE = 'N'
*
                     DO 30 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 2
*                       Solve and compute residual for op(A)*x = b.
*
                        SRNAMT = 'SLARHS'
                        CALL SLARHS( PATH, XTYPE, UPLO, TRANS, N, N, 0,
     $                               IDIAG, NRHS, A, LDA, XACT, LDA, B,
     $                               LDA, ISEED, INFO )
                        XTYPE = 'C'
                        CALL SLACPY( 'Full', N, NRHS, B, LDA, X, LDA )
*
                        SRNAMT = 'STRTRS'
                        CALL STRTRS( UPLO, TRANS, DIAG, N, NRHS, A, LDA,
     $                               X, LDA, INFO )
*
*                       Check error code from STRTRS.
*
                        IF( INFO.NE.0 )
     $                     CALL ALAERH( PATH, 'STRTRS', INFO, 0,
     $                                  UPLO // TRANS // DIAG, N, N, -1,
     $                                  -1, NRHS, IMAT, NFAIL, NERRS,
     $                                  NOUT )
*
*                       This line is needed on a Sun SPARCstation.
*
                        IF( N.GT.0 )
     $                     DUMMY = A( 1 )
*
                        CALL STRT02( UPLO, TRANS, DIAG, N, NRHS, A, LDA,
     $                               X, LDA, B, LDA, WORK, RESULT( 2 ) )
*
*+    TEST 3
*                       Check solution from generated exact solution.
*
                        CALL SGET04( N, NRHS, X, LDA, XACT, LDA, RCONDC,
     $                               RESULT( 3 ) )
*
*+    TESTS 4, 5, and 6
*                       Use iterative refinement to improve the solution
*                       and compute error bounds.
*
                        SRNAMT = 'STRRFS'
                        CALL STRRFS( UPLO, TRANS, DIAG, N, NRHS, A, LDA,
     $                               B, LDA, X, LDA, RWORK,
     $                               RWORK( NRHS+1 ), WORK, IWORK,
     $                               INFO )
*
*                       Check error code from STRRFS.
*
                        IF( INFO.NE.0 )
     $                     CALL ALAERH( PATH, 'STRRFS', INFO, 0,
     $                                  UPLO // TRANS // DIAG, N, N, -1,
     $                                  -1, NRHS, IMAT, NFAIL, NERRS,
     $                                  NOUT )
*
                        CALL SGET04( N, NRHS, X, LDA, XACT, LDA, RCONDC,
     $                               RESULT( 4 ) )
                        CALL STRT05( UPLO, TRANS, DIAG, N, NRHS, A, LDA,
     $                               B, LDA, X, LDA, XACT, LDA, RWORK,
     $                               RWORK( NRHS+1 ), RESULT( 5 ) )
*
*                       Print information about the tests that did not
*                       pass the threshold.
*
                        DO 20 K = 2, 6
                           IF( RESULT( K ).GE.THRESH ) THEN
                              IF( NFAIL.EQ.0 .AND. NERRS.EQ.0 )
     $                           CALL ALAHD( NOUT, PATH )
                              WRITE( NOUT, FMT = 9998 )UPLO, TRANS,
     $                           DIAG, N, NRHS, IMAT, K, RESULT( K )
                              NFAIL = NFAIL + 1
                           END IF
   20                   CONTINUE
                        NRUN = NRUN + 5
   30                CONTINUE
   40             CONTINUE
*
*+    TEST 7
*                       Get an estimate of RCOND = 1/CNDNUM.
*
                  DO 50 ITRAN = 1, 2
                     IF( ITRAN.EQ.1 ) THEN
                        NORM = 'O'
                        RCONDC = RCONDO
                     ELSE
                        NORM = 'I'
                        RCONDC = RCONDI
                     END IF
                     SRNAMT = 'STRCON'
                     CALL STRCON( NORM, UPLO, DIAG, N, A, LDA, RCOND,
     $                            WORK, IWORK, INFO )
*
*                       Check error code from STRCON.
*
                     IF( INFO.NE.0 )
     $                  CALL ALAERH( PATH, 'STRCON', INFO, 0,
     $                               NORM // UPLO // DIAG, N, N, -1, -1,
     $                               -1, IMAT, NFAIL, NERRS, NOUT )
*
                     CALL STRT06( RCOND, RCONDC, UPLO, DIAG, N, A, LDA,
     $                            RWORK, RESULT( 7 ) )
*
*                    Print the test ratio if it is .GE. THRESH.
*
                     IF( RESULT( 7 ).GE.THRESH ) THEN
                        IF( NFAIL.EQ.0 .AND. NERRS.EQ.0 )
     $                     CALL ALAHD( NOUT, PATH )
                        WRITE( NOUT, FMT = 9997 )NORM, UPLO, N, IMAT,
     $                     7, RESULT( 7 )
                        NFAIL = NFAIL + 1
                     END IF
                     NRUN = NRUN + 1
   50             CONTINUE
   60          CONTINUE
   70       CONTINUE
   80    CONTINUE
*
*        Use pathological test matrices to test SLATRS.
*
         DO 110 IMAT = NTYPE1 + 1, NTYPES
*
*           Do the tests only if DOTYPE( IMAT ) is true.
*
            IF( .NOT.DOTYPE( IMAT ) )
     $         GO TO 110
*
            DO 100 IUPLO = 1, 2
*
*              Do first for UPLO = 'U', then for UPLO = 'L'
*
               UPLO = UPLOS( IUPLO )
               DO 90 ITRAN = 1, NTRAN
*
*                 Do for op(A) = A, A**T, and A**H.
*
                  TRANS = TRANSS( ITRAN )
*
*                 Call SLATTR to generate a triangular test matrix.
*
                  SRNAMT = 'SLATTR'
                  CALL SLATTR( IMAT, UPLO, TRANS, DIAG, ISEED, N, A,
     $                         LDA, X, WORK, INFO )
*
*+    TEST 8
*                 Solve the system op(A)*x = b.
*
                  SRNAMT = 'SLATRS'
                  CALL SCOPY( N, X, 1, B, 1 )
                  CALL SLATRS( UPLO, TRANS, DIAG, 'N', N, A, LDA, B,
     $                         SCALE, RWORK, INFO )
*
*                 Check error code from SLATRS.
*
                  IF( INFO.NE.0 )
     $               CALL ALAERH( PATH, 'SLATRS', INFO, 0,
     $                            UPLO // TRANS // DIAG // 'N', N, N,
     $                            -1, -1, -1, IMAT, NFAIL, NERRS, NOUT )
*
                  CALL STRT03( UPLO, TRANS, DIAG, N, 1, A, LDA, SCALE,
     $                         RWORK, ONE, B, LDA, X, LDA, WORK,
     $                         RESULT( 8 ) )
*
*+    TEST 9
*                 Solve op(A)*X = b again with NORMIN = 'Y'.
*
                  CALL SCOPY( N, X, 1, B( N+1 ), 1 )
                  CALL SLATRS( UPLO, TRANS, DIAG, 'Y', N, A, LDA,
     $                         B( N+1 ), SCALE, RWORK, INFO )
*
*                 Check error code from SLATRS.
*
                  IF( INFO.NE.0 )
     $               CALL ALAERH( PATH, 'SLATRS', INFO, 0,
     $                            UPLO // TRANS // DIAG // 'Y', N, N,
     $                            -1, -1, -1, IMAT, NFAIL, NERRS, NOUT )
*
                  CALL STRT03( UPLO, TRANS, DIAG, N, 1, A, LDA, SCALE,
     $                         RWORK, ONE, B( N+1 ), LDA, X, LDA, WORK,
     $                         RESULT( 9 ) )
*
*                 Print information about the tests that did not pass
*                 the threshold.
*
                  IF( RESULT( 8 ).GE.THRESH ) THEN
                     IF( NFAIL.EQ.0 .AND. NERRS.EQ.0 )
     $                  CALL ALAHD( NOUT, PATH )
                     WRITE( NOUT, FMT = 9996 )'SLATRS', UPLO, TRANS,
     $                  DIAG, 'N', N, IMAT, 8, RESULT( 8 )
                     NFAIL = NFAIL + 1
                  END IF
                  IF( RESULT( 9 ).GE.THRESH ) THEN
                     IF( NFAIL.EQ.0 .AND. NERRS.EQ.0 )
     $                  CALL ALAHD( NOUT, PATH )
                     WRITE( NOUT, FMT = 9996 )'SLATRS', UPLO, TRANS,
     $                  DIAG, 'Y', N, IMAT, 9, RESULT( 9 )
                     NFAIL = NFAIL + 1
                  END IF
                  NRUN = NRUN + 2
   90          CONTINUE
  100       CONTINUE
  110    CONTINUE
  120 CONTINUE
*
*     Print a summary of the results.
*
      CALL ALASUM( PATH, NOUT, NFAIL, NRUN, NERRS )
*
 9999 FORMAT( ' UPLO=''', A1, ''', DIAG=''', A1, ''', N=', I5, ', NB=',
     $      I4, ', type ', I2, ', test(', I2, ')= ', G12.5 )
 9998 FORMAT( ' UPLO=''', A1, ''', TRANS=''', A1, ''', DIAG=''', A1,
     $      ''', N=', I5, ', NB=', I4, ', type ', I2, ',
     $      test(', I2, ')= ', G12.5 )
 9997 FORMAT( ' NORM=''', A1, ''', UPLO =''', A1, ''', N=', I5, ',',
     $      11X, ' type ', I2, ', test(', I2, ')=', G12.5 )
 9996 FORMAT( 1X, A6, '( ''', A1, ''', ''', A1, ''', ''', A1, ''', ''',
     $      A1, ''',', I5, ', ... ), type ', I2, ', test(', I2, ')=',
     $      G12.5 )
      RETURN
*
*     End of SCHKTR
*
      END