dlasda.f.html

来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 415 行 · 第 1/3 页

         NR = IWORK( NDIMR+I1 )
         NLF = IC - NL
         NRF = IC + 1
         IDXQI = IDXQ + NLF - 2
         VFI = VF + NLF - 1
         VLI = VL + NLF - 1
         SQREI = 1
         IF( ICOMPQ.EQ.0 ) THEN
            CALL <a name="DLASET.268"></a><a href="dlaset.f.html#DLASET.1">DLASET</a>( <span class="string">'A'</span>, NLP1, NLP1, ZERO, ONE, WORK( NWORK1 ),
     $                   SMLSZP )
            CALL <a name="DLASDQ.270"></a><a href="dlasdq.f.html#DLASDQ.1">DLASDQ</a>( <span class="string">'U'</span>, SQREI, NL, NLP1, NRU, NCC, D( NLF ),
     $                   E( NLF ), WORK( NWORK1 ), SMLSZP,
     $                   WORK( NWORK2 ), NL, WORK( NWORK2 ), NL,
     $                   WORK( NWORK2 ), INFO )
            ITEMP = NWORK1 + NL*SMLSZP
            CALL DCOPY( NLP1, WORK( NWORK1 ), 1, WORK( VFI ), 1 )
            CALL DCOPY( NLP1, WORK( ITEMP ), 1, WORK( VLI ), 1 )
         ELSE
            CALL <a name="DLASET.278"></a><a href="dlaset.f.html#DLASET.1">DLASET</a>( <span class="string">'A'</span>, NL, NL, ZERO, ONE, U( NLF, 1 ), LDU )
            CALL <a name="DLASET.279"></a><a href="dlaset.f.html#DLASET.1">DLASET</a>( <span class="string">'A'</span>, NLP1, NLP1, ZERO, ONE, VT( NLF, 1 ), LDU )
            CALL <a name="DLASDQ.280"></a><a href="dlasdq.f.html#DLASDQ.1">DLASDQ</a>( <span class="string">'U'</span>, SQREI, NL, NLP1, NL, NCC, D( NLF ),
     $                   E( NLF ), VT( NLF, 1 ), LDU, U( NLF, 1 ), LDU,
     $                   U( NLF, 1 ), LDU, WORK( NWORK1 ), INFO )
            CALL DCOPY( NLP1, VT( NLF, 1 ), 1, WORK( VFI ), 1 )
            CALL DCOPY( NLP1, VT( NLF, NLP1 ), 1, WORK( VLI ), 1 )
         END IF
         IF( INFO.NE.0 ) THEN
            RETURN
         END IF
         DO 10 J = 1, NL
            IWORK( IDXQI+J ) = J
   10    CONTINUE
         IF( ( I.EQ.ND ) .AND. ( SQRE.EQ.0 ) ) THEN
            SQREI = 0
         ELSE
            SQREI = 1
         END IF
         IDXQI = IDXQI + NLP1
         VFI = VFI + NLP1
         VLI = VLI + NLP1
         NRP1 = NR + SQREI
         IF( ICOMPQ.EQ.0 ) THEN
            CALL <a name="DLASET.302"></a><a href="dlaset.f.html#DLASET.1">DLASET</a>( <span class="string">'A'</span>, NRP1, NRP1, ZERO, ONE, WORK( NWORK1 ),
     $                   SMLSZP )
            CALL <a name="DLASDQ.304"></a><a href="dlasdq.f.html#DLASDQ.1">DLASDQ</a>( <span class="string">'U'</span>, SQREI, NR, NRP1, NRU, NCC, D( NRF ),
     $                   E( NRF ), WORK( NWORK1 ), SMLSZP,
     $                   WORK( NWORK2 ), NR, WORK( NWORK2 ), NR,
     $                   WORK( NWORK2 ), INFO )
            ITEMP = NWORK1 + ( NRP1-1 )*SMLSZP
            CALL DCOPY( NRP1, WORK( NWORK1 ), 1, WORK( VFI ), 1 )
            CALL DCOPY( NRP1, WORK( ITEMP ), 1, WORK( VLI ), 1 )
         ELSE
            CALL <a name="DLASET.312"></a><a href="dlaset.f.html#DLASET.1">DLASET</a>( <span class="string">'A'</span>, NR, NR, ZERO, ONE, U( NRF, 1 ), LDU )
            CALL <a name="DLASET.313"></a><a href="dlaset.f.html#DLASET.1">DLASET</a>( <span class="string">'A'</span>, NRP1, NRP1, ZERO, ONE, VT( NRF, 1 ), LDU )
            CALL <a name="DLASDQ.314"></a><a href="dlasdq.f.html#DLASDQ.1">DLASDQ</a>( <span class="string">'U'</span>, SQREI, NR, NRP1, NR, NCC, D( NRF ),
     $                   E( NRF ), VT( NRF, 1 ), LDU, U( NRF, 1 ), LDU,
     $                   U( NRF, 1 ), LDU, WORK( NWORK1 ), INFO )
            CALL DCOPY( NRP1, VT( NRF, 1 ), 1, WORK( VFI ), 1 )
            CALL DCOPY( NRP1, VT( NRF, NRP1 ), 1, WORK( VLI ), 1 )
         END IF
         IF( INFO.NE.0 ) THEN
            RETURN
         END IF
         DO 20 J = 1, NR
            IWORK( IDXQI+J ) = J
   20    CONTINUE
   30 CONTINUE
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     Now conquer each subproblem bottom-up.
</span><span class="comment">*</span><span class="comment">
</span>      J = 2**NLVL
      DO 50 LVL = NLVL, 1, -1
         LVL2 = LVL*2 - 1
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">        Find the first node LF and last node LL on
</span><span class="comment">*</span><span class="comment">        the current level LVL.
</span><span class="comment">*</span><span class="comment">
</span>         IF( LVL.EQ.1 ) THEN
            LF = 1
            LL = 1
         ELSE
            LF = 2**( LVL-1 )
            LL = 2*LF - 1
         END IF
         DO 40 I = LF, LL
            IM1 = I - 1
            IC = IWORK( INODE+IM1 )
            NL = IWORK( NDIML+IM1 )
            NR = IWORK( NDIMR+IM1 )
            NLF = IC - NL
            NRF = IC + 1
            IF( I.EQ.LL ) THEN
               SQREI = SQRE
            ELSE
               SQREI = 1
            END IF
            VFI = VF + NLF - 1
            VLI = VL + NLF - 1
            IDXQI = IDXQ + NLF - 1
            ALPHA = D( IC )
            BETA = E( IC )
            IF( ICOMPQ.EQ.0 ) THEN
               CALL <a name="DLASD6.362"></a><a href="dlasd6.f.html#DLASD6.1">DLASD6</a>( ICOMPQ, NL, NR, SQREI, D( NLF ),
     $                      WORK( VFI ), WORK( VLI ), ALPHA, BETA,
     $                      IWORK( IDXQI ), PERM, GIVPTR( 1 ), GIVCOL,
     $                      LDGCOL, GIVNUM, LDU, POLES, DIFL, DIFR, Z,
     $                      K( 1 ), C( 1 ), S( 1 ), WORK( NWORK1 ),
     $                      IWORK( IWK ), INFO )
            ELSE
               J = J - 1
               CALL <a name="DLASD6.370"></a><a href="dlasd6.f.html#DLASD6.1">DLASD6</a>( ICOMPQ, NL, NR, SQREI, D( NLF ),
     $                      WORK( VFI ), WORK( VLI ), ALPHA, BETA,
     $                      IWORK( IDXQI ), PERM( NLF, LVL ),
     $                      GIVPTR( J ), GIVCOL( NLF, LVL2 ), LDGCOL,
     $                      GIVNUM( NLF, LVL2 ), LDU,
     $                      POLES( NLF, LVL2 ), DIFL( NLF, LVL ),
     $                      DIFR( NLF, LVL2 ), Z( NLF, LVL ), K( J ),
     $                      C( J ), S( J ), WORK( NWORK1 ),
     $                      IWORK( IWK ), INFO )
            END IF
            IF( INFO.NE.0 ) THEN
               RETURN
            END IF
   40    CONTINUE
   50 CONTINUE
<span class="comment">*</span><span class="comment">
</span>      RETURN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     End of <a name="DLASDA.388"></a><a href="dlasda.f.html#DLASDA.1">DLASDA</a>
</span><span class="comment">*</span><span class="comment">
</span>      END

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