sdrvsy.f

来自「famous linear algebra library (LAPACK) p」· F 代码 · 共 505 行 · 第 1/2 页

*
                        DO 90 J = 1, N
                           I1 = MAX( J, IZERO )
                           DO 80 I = I1, N
                              A( IOFF+I ) = ZERO
   80                      CONTINUE
                           IOFF = IOFF + LDA
   90                   CONTINUE
                     END IF
                  END IF
               ELSE
                  IZERO = 0
               END IF
*
               DO 150 IFACT = 1, NFACT
*
*                 Do first for FACT = 'F', then for other values.
*
                  FACT = FACTS( IFACT )
*
*                 Compute the condition number for comparison with
*                 the value returned by SSYSVX.
*
                  IF( ZEROT ) THEN
                     IF( IFACT.EQ.1 )
     $                  GO TO 150
                     RCONDC = ZERO
*
                  ELSE IF( IFACT.EQ.1 ) THEN
*
*                    Compute the 1-norm of A.
*
                     ANORM = SLANSY( '1', UPLO, N, A, LDA, RWORK )
*
*                    Factor the matrix A.
*
                     CALL SLACPY( UPLO, N, N, A, LDA, AFAC, LDA )
                     CALL SSYTRF( UPLO, N, AFAC, LDA, IWORK, WORK,
     $                            LWORK, INFO )
*
*                    Compute inv(A) and take its norm.
*
                     CALL SLACPY( UPLO, N, N, AFAC, LDA, AINV, LDA )
                     CALL SSYTRI( UPLO, N, AINV, LDA, IWORK, WORK,
     $                            INFO )
                     AINVNM = SLANSY( '1', UPLO, N, AINV, LDA, RWORK )
*
*                    Compute the 1-norm condition number of A.
*
                     IF( ANORM.LE.ZERO .OR. AINVNM.LE.ZERO ) THEN
                        RCONDC = ONE
                     ELSE
                        RCONDC = ( ONE / ANORM ) / AINVNM
                     END IF
                  END IF
*
*                 Form an exact solution and set the right hand side.
*
                  SRNAMT = 'SLARHS'
                  CALL SLARHS( PATH, XTYPE, UPLO, ' ', N, N, KL, KU,
     $                         NRHS, A, LDA, XACT, LDA, B, LDA, ISEED,
     $                         INFO )
                  XTYPE = 'C'
*
*                 --- Test SSYSV  ---
*
                  IF( IFACT.EQ.2 ) THEN
                     CALL SLACPY( UPLO, N, N, A, LDA, AFAC, LDA )
                     CALL SLACPY( 'Full', N, NRHS, B, LDA, X, LDA )
*
*                    Factor the matrix and solve the system using SSYSV.
*
                     SRNAMT = 'SSYSV '
                     CALL SSYSV( UPLO, N, NRHS, AFAC, LDA, IWORK, X,
     $                           LDA, WORK, LWORK, INFO )
*
*                    Adjust the expected value of INFO to account for
*                    pivoting.
*
                     K = IZERO
                     IF( K.GT.0 ) THEN
  100                   CONTINUE
                        IF( IWORK( K ).LT.0 ) THEN
                           IF( IWORK( K ).NE.-K ) THEN
                              K = -IWORK( K )
                              GO TO 100
                           END IF
                        ELSE IF( IWORK( K ).NE.K ) THEN
                           K = IWORK( K )
                           GO TO 100
                        END IF
                     END IF
*
*                    Check error code from SSYSV .
*
                     IF( INFO.NE.K ) THEN
                        CALL ALAERH( PATH, 'SSYSV ', INFO, K, UPLO, N,
     $                               N, -1, -1, NRHS, IMAT, NFAIL,
     $                               NERRS, NOUT )
                        GO TO 120
                     ELSE IF( INFO.NE.0 ) THEN
                        GO TO 120
                     END IF
*
*                    Reconstruct matrix from factors and compute
*                    residual.
*
                     CALL SSYT01( UPLO, N, A, LDA, AFAC, LDA, IWORK,
     $                            AINV, LDA, RWORK, RESULT( 1 ) )
*
*                    Compute residual of the computed solution.
*
                     CALL SLACPY( 'Full', N, NRHS, B, LDA, WORK, LDA )
                     CALL SPOT02( UPLO, N, NRHS, A, LDA, X, LDA, WORK,
     $                            LDA, RWORK, RESULT( 2 ) )
*
*                    Check solution from generated exact solution.
*
                     CALL SGET04( N, NRHS, X, LDA, XACT, LDA, RCONDC,
     $                            RESULT( 3 ) )
                     NT = 3
*
*                    Print information about the tests that did not pass
*                    the threshold.
*
                     DO 110 K = 1, NT
                        IF( RESULT( K ).GE.THRESH ) THEN
                           IF( NFAIL.EQ.0 .AND. NERRS.EQ.0 )
     $                        CALL ALADHD( NOUT, PATH )
                           WRITE( NOUT, FMT = 9999 )'SSYSV ', UPLO, N,
     $                        IMAT, K, RESULT( K )
                           NFAIL = NFAIL + 1
                        END IF
  110                CONTINUE
                     NRUN = NRUN + NT
  120                CONTINUE
                  END IF
*
*                 --- Test SSYSVX ---
*
                  IF( IFACT.EQ.2 )
     $               CALL SLASET( UPLO, N, N, ZERO, ZERO, AFAC, LDA )
                  CALL SLASET( 'Full', N, NRHS, ZERO, ZERO, X, LDA )
*
*                 Solve the system and compute the condition number and
*                 error bounds using SSYSVX.
*
                  SRNAMT = 'SSYSVX'
                  CALL SSYSVX( FACT, UPLO, N, NRHS, A, LDA, AFAC, LDA,
     $                         IWORK, B, LDA, X, LDA, RCOND, RWORK,
     $                         RWORK( NRHS+1 ), WORK, LWORK,
     $                         IWORK( N+1 ), INFO )
*
*                 Adjust the expected value of INFO to account for
*                 pivoting.
*
                  K = IZERO
                  IF( K.GT.0 ) THEN
  130                CONTINUE
                     IF( IWORK( K ).LT.0 ) THEN
                        IF( IWORK( K ).NE.-K ) THEN
                           K = -IWORK( K )
                           GO TO 130
                        END IF
                     ELSE IF( IWORK( K ).NE.K ) THEN
                        K = IWORK( K )
                        GO TO 130
                     END IF
                  END IF
*
*                 Check the error code from SSYSVX.
*
                  IF( INFO.NE.K ) THEN
                     CALL ALAERH( PATH, 'SSYSVX', INFO, K, FACT // UPLO,
     $                            N, N, -1, -1, NRHS, IMAT, NFAIL,
     $                            NERRS, NOUT )
                     GO TO 150
                  END IF
*
                  IF( INFO.EQ.0 ) THEN
                     IF( IFACT.GE.2 ) THEN
*
*                       Reconstruct matrix from factors and compute
*                       residual.
*
                        CALL SSYT01( UPLO, N, A, LDA, AFAC, LDA, IWORK,
     $                               AINV, LDA, RWORK( 2*NRHS+1 ),
     $                               RESULT( 1 ) )
                        K1 = 1
                     ELSE
                        K1 = 2
                     END IF
*
*                    Compute residual of the computed solution.
*
                     CALL SLACPY( 'Full', N, NRHS, B, LDA, WORK, LDA )
                     CALL SPOT02( UPLO, N, NRHS, A, LDA, X, LDA, WORK,
     $                            LDA, RWORK( 2*NRHS+1 ), RESULT( 2 ) )
*
*                    Check solution from generated exact solution.
*
                     CALL SGET04( N, NRHS, X, LDA, XACT, LDA, RCONDC,
     $                            RESULT( 3 ) )
*
*                    Check the error bounds from iterative refinement.
*
                     CALL SPOT05( UPLO, N, NRHS, A, LDA, B, LDA, X, LDA,
     $                            XACT, LDA, RWORK, RWORK( NRHS+1 ),
     $                            RESULT( 4 ) )
                  ELSE
                     K1 = 6
                  END IF
*
*                 Compare RCOND from SSYSVX with the computed value
*                 in RCONDC.
*
                  RESULT( 6 ) = SGET06( RCOND, RCONDC )
*
*                 Print information about the tests that did not pass
*                 the threshold.
*
                  DO 140 K = K1, 6
                     IF( RESULT( K ).GE.THRESH ) THEN
                        IF( NFAIL.EQ.0 .AND. NERRS.EQ.0 )
     $                     CALL ALADHD( NOUT, PATH )
                        WRITE( NOUT, FMT = 9998 )'SSYSVX', FACT, UPLO,
     $                     N, IMAT, K, RESULT( K )
                        NFAIL = NFAIL + 1
                     END IF
  140             CONTINUE
                  NRUN = NRUN + 7 - K1
*
  150          CONTINUE
*
  160       CONTINUE
  170    CONTINUE
  180 CONTINUE
*
*     Print a summary of the results.
*
      CALL ALASVM( PATH, NOUT, NFAIL, NRUN, NERRS )
*
 9999 FORMAT( 1X, A6, ', UPLO=''', A1, ''', N =', I5, ', type ', I2,
     $      ', test ', I2, ', ratio =', G12.5 )
 9998 FORMAT( 1X, A6, ', FACT=''', A1, ''', UPLO=''', A1, ''', N =', I5,
     $      ', type ', I2, ', test ', I2, ', ratio =', G12.5 )
      RETURN
*
*     End of SDRVSY
*
      END