dtgsy2.f.html

来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 981 行 · 第 1/5 页

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                  Z( 3, 2 ) = ZERO
                  Z( 4, 2 ) = D( IS, IS )
<span class="comment">*</span><span class="comment">
</span>                  Z( 1, 3 ) = -B( JS, JS )
                  Z( 2, 3 ) = -B( JS, JSP1 )
                  Z( 3, 3 ) = -E( JS, JS )
                  Z( 4, 3 ) = -E( JS, JSP1 )
<span class="comment">*</span><span class="comment">
</span>                  Z( 1, 4 ) = -B( JSP1, JS )
                  Z( 2, 4 ) = -B( JSP1, JSP1 )
                  Z( 3, 4 ) = ZERO
                  Z( 4, 4 ) = -E( JSP1, JSP1 )
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">                 Set up right hand side(s)
</span><span class="comment">*</span><span class="comment">
</span>                  RHS( 1 ) = C( IS, JS )
                  RHS( 2 ) = C( IS, JSP1 )
                  RHS( 3 ) = F( IS, JS )
                  RHS( 4 ) = F( IS, JSP1 )
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">                 Solve Z * x = RHS
</span><span class="comment">*</span><span class="comment">
</span>                  CALL <a name="DGETC2.398"></a><a href="dgetc2.f.html#DGETC2.1">DGETC2</a>( ZDIM, Z, LDZ, IPIV, JPIV, IERR )
                  IF( IERR.GT.0 )
     $               INFO = IERR
<span class="comment">*</span><span class="comment">
</span>                  IF( IJOB.EQ.0 ) THEN
                     CALL <a name="DGESC2.403"></a><a href="dgesc2.f.html#DGESC2.1">DGESC2</a>( ZDIM, Z, LDZ, RHS, IPIV, JPIV,
     $                            SCALOC )
                     IF( SCALOC.NE.ONE ) THEN
                        DO 60 K = 1, N
                           CALL DSCAL( M, SCALOC, C( 1, K ), 1 )
                           CALL DSCAL( M, SCALOC, F( 1, K ), 1 )
   60                   CONTINUE
                        SCALE = SCALE*SCALOC
                     END IF
                  ELSE
                     CALL <a name="DLATDF.413"></a><a href="dlatdf.f.html#DLATDF.1">DLATDF</a>( IJOB, ZDIM, Z, LDZ, RHS, RDSUM,
     $                            RDSCAL, IPIV, JPIV )
                  END IF
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">                 Unpack solution vector(s)
</span><span class="comment">*</span><span class="comment">
</span>                  C( IS, JS ) = RHS( 1 )
                  C( IS, JSP1 ) = RHS( 2 )
                  F( IS, JS ) = RHS( 3 )
                  F( IS, JSP1 ) = RHS( 4 )
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">                 Substitute R(I, J) and L(I, J) into remaining
</span><span class="comment">*</span><span class="comment">                 equation.
</span><span class="comment">*</span><span class="comment">
</span>                  IF( I.GT.1 ) THEN
                     CALL DGER( IS-1, NB, -ONE, A( 1, IS ), 1, RHS( 1 ),
     $                          1, C( 1, JS ), LDC )
                     CALL DGER( IS-1, NB, -ONE, D( 1, IS ), 1, RHS( 1 ),
     $                          1, F( 1, JS ), LDF )
                  END IF
                  IF( J.LT.Q ) THEN
                     CALL DAXPY( N-JE, RHS( 3 ), B( JS, JE+1 ), LDB,
     $                           C( IS, JE+1 ), LDC )
                     CALL DAXPY( N-JE, RHS( 3 ), E( JS, JE+1 ), LDE,
     $                           F( IS, JE+1 ), LDF )
                     CALL DAXPY( N-JE, RHS( 4 ), B( JSP1, JE+1 ), LDB,
     $                           C( IS, JE+1 ), LDC )
                     CALL DAXPY( N-JE, RHS( 4 ), E( JSP1, JE+1 ), LDE,
     $                           F( IS, JE+1 ), LDF )
                  END IF
<span class="comment">*</span><span class="comment">
</span>               ELSE IF( ( MB.EQ.2 ) .AND. ( NB.EQ.1 ) ) THEN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">                 Build a 4-by-4 system Z * x = RHS
</span><span class="comment">*</span><span class="comment">
</span>                  Z( 1, 1 ) = A( IS, IS )
                  Z( 2, 1 ) = A( ISP1, IS )
                  Z( 3, 1 ) = D( IS, IS )
                  Z( 4, 1 ) = ZERO
<span class="comment">*</span><span class="comment">
</span>                  Z( 1, 2 ) = A( IS, ISP1 )
                  Z( 2, 2 ) = A( ISP1, ISP1 )
                  Z( 3, 2 ) = D( IS, ISP1 )
                  Z( 4, 2 ) = D( ISP1, ISP1 )
<span class="comment">*</span><span class="comment">
</span>                  Z( 1, 3 ) = -B( JS, JS )
                  Z( 2, 3 ) = ZERO
                  Z( 3, 3 ) = -E( JS, JS )
                  Z( 4, 3 ) = ZERO
<span class="comment">*</span><span class="comment">
</span>                  Z( 1, 4 ) = ZERO
                  Z( 2, 4 ) = -B( JS, JS )
                  Z( 3, 4 ) = ZERO
                  Z( 4, 4 ) = -E( JS, JS )
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">                 Set up right hand side(s)
</span><span class="comment">*</span><span class="comment">
</span>                  RHS( 1 ) = C( IS, JS )
                  RHS( 2 ) = C( ISP1, JS )
                  RHS( 3 ) = F( IS, JS )
                  RHS( 4 ) = F( ISP1, JS )
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">                 Solve Z * x = RHS
</span><span class="comment">*</span><span class="comment">
</span>                  CALL <a name="DGETC2.477"></a><a href="dgetc2.f.html#DGETC2.1">DGETC2</a>( ZDIM, Z, LDZ, IPIV, JPIV, IERR )
                  IF( IERR.GT.0 )
     $               INFO = IERR
                  IF( IJOB.EQ.0 ) THEN
                     CALL <a name="DGESC2.481"></a><a href="dgesc2.f.html#DGESC2.1">DGESC2</a>( ZDIM, Z, LDZ, RHS, IPIV, JPIV,
     $                            SCALOC )
                     IF( SCALOC.NE.ONE ) THEN
                        DO 70 K = 1, N
                           CALL DSCAL( M, SCALOC, C( 1, K ), 1 )
                           CALL DSCAL( M, SCALOC, F( 1, K ), 1 )
   70                   CONTINUE
                        SCALE = SCALE*SCALOC
                     END IF
                  ELSE
                     CALL <a name="DLATDF.491"></a><a href="dlatdf.f.html#DLATDF.1">DLATDF</a>( IJOB, ZDIM, Z, LDZ, RHS, RDSUM,
     $                            RDSCAL, IPIV, JPIV )
                  END IF
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">                 Unpack solution vector(s)
</span><span class="comment">*</span><span class="comment">
</span>                  C( IS, JS ) = RHS( 1 )
                  C( ISP1, JS ) = RHS( 2 )
                  F( IS, JS ) = RHS( 3 )
                  F( ISP1, JS ) = RHS( 4 )
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">                 Substitute R(I, J) and L(I, J) into remaining
</span><span class="comment">*</span><span class="comment">                 equation.
</span><span class="comment">*</span><span class="comment">
</span>                  IF( I.GT.1 ) THEN
                     CALL DGEMV( <span class="string">'N'</span>, IS-1, MB, -ONE, A( 1, IS ), LDA,
     $                           RHS( 1 ), 1, ONE, C( 1, JS ), 1 )
                     CALL DGEMV( <span class="string">'N'</span>, IS-1, MB, -ONE, D( 1, IS ), LDD,
     $                           RHS( 1 ), 1, ONE, F( 1, JS ), 1 )
                  END IF
                  IF( J.LT.Q ) THEN
                     CALL DGER( MB, N-JE, ONE, RHS( 3 ), 1,
     $                          B( JS, JE+1 ), LDB, C( IS, JE+1 ), LDC )
                     CALL DGER( MB, N-JE, ONE, RHS( 3 ), 1,
     $                          E( JS, JE+1 ), LDE, F( IS, JE+1 ), LDF )
                  END IF
<span class="comment">*</span><span class="comment">
</span>               ELSE IF( ( MB.EQ.2 ) .AND. ( NB.EQ.2 ) ) THEN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">                 Build an 8-by-8 system Z * x = RHS
</span><span class="comment">*</span><span class="comment">
</span>                  CALL <a name="DLASET.522"></a><a href="dlaset.f.html#DLASET.1">DLASET</a>( <span class="string">'F'</span>, LDZ, LDZ, ZERO, ZERO, Z, LDZ )
<span class="comment">*</span><span class="comment">
</span>                  Z( 1, 1 ) = A( IS, IS )
                  Z( 2, 1 ) = A( ISP1, IS )
                  Z( 5, 1 ) = D( IS, IS )
<span class="comment">*</span><span class="comment">
</span>                  Z( 1, 2 ) = A( IS, ISP1 )
                  Z( 2, 2 ) = A( ISP1, ISP1 )
                  Z( 5, 2 ) = D( IS, ISP1 )
                  Z( 6, 2 ) = D( ISP1, ISP1 )
<span class="comment">*</span><span class="comment">
</span>                  Z( 3, 3 ) = A( IS, IS )
                  Z( 4, 3 ) = A( ISP1, IS )
                  Z( 7, 3 ) = D( IS, IS )
<span class="comment">*</span><span class="comment">
</span>                  Z( 3, 4 ) = A( IS, ISP1 )
                  Z( 4, 4 ) = A( ISP1, ISP1 )
                  Z( 7, 4 ) = D( IS, ISP1 )
                  Z( 8, 4 ) = D( ISP1, ISP1 )
<span class="comment">*</span><span class="comment">
</span>                  Z( 1, 5 ) = -B( JS, JS )
                  Z( 3, 5 ) = -B( JS, JSP1 )
                  Z( 5, 5 ) = -E( JS, JS )
                  Z( 7, 5 ) = -E( JS, JSP1 )
<span class="comment">*</span><span class="comment">
</span>                  Z( 2, 6 ) = -B( JS, JS )
                  Z( 4, 6 ) = -B( JS, JSP1 )
                  Z( 6, 6 ) = -E( JS, JS )
                  Z( 8, 6 ) = -E( JS, JSP1 )
<span class="comment">*</span><span class="comment">
</span>                  Z( 1, 7 ) = -B( JSP1, JS )
                  Z( 3, 7 ) = -B( JSP1, JSP1 )
                  Z( 7, 7 ) = -E( JSP1, JSP1 )
<span class="comment">*</span><span class="comment">
</span>                  Z( 2, 8 ) = -B( JSP1, JS )
                  Z( 4, 8 ) = -B( JSP1, JSP1 )
                  Z( 8, 8 ) = -E( JSP1, JSP1 )
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">                 Set up right hand side(s)
</span><span class="comment">*</span><span class="comment">
</span>                  K = 1
                  II = MB*NB + 1
                  DO 80 JJ = 0, NB - 1
                     CALL DCOPY( MB, C( IS, JS+JJ ), 1, RHS( K ), 1 )
                     CALL DCOPY( MB, F( IS, JS+JJ ), 1, RHS( II ), 1 )
                     K = K + MB
                     II = II + MB
   80             CONTINUE
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">                 Solve Z * x = RHS
</span><span class="comment">*</span><span class="comment">
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dtgsy2.f.html - 源码说明

本页面展示了「famous linear algebra library (LAPACK) ports to windows」中的 dtgsy2.f.html 源码文件，采用 HTML 编程语言编写，共 981 行代码。您可以在线阅读完整代码内容，也可以返回资源详情页下载完整源码包进行本地学习和开发。

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