cunmbr.f.html

来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 314 行 · 第 1/2 页
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314 行
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Executable Statements ..
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     Test the input arguments
</span><span class="comment">*</span><span class="comment">
</span>      INFO = 0
      APPLYQ = <a name="LSAME.145"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( VECT, <span class="string">'Q'</span> )
      LEFT = <a name="LSAME.146"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( SIDE, <span class="string">'L'</span> )
      NOTRAN = <a name="LSAME.147"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( TRANS, <span class="string">'N'</span> )
      LQUERY = ( LWORK.EQ.-1 )
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     NQ is the order of Q or P and NW is the minimum dimension of WORK
</span><span class="comment">*</span><span class="comment">
</span>      IF( LEFT ) THEN
         NQ = M
         NW = N
      ELSE
         NQ = N
         NW = M
      END IF
      IF( M.EQ.0 .OR. N.EQ.0 ) THEN
         NW = 0
      END IF
      IF( .NOT.APPLYQ .AND. .NOT.<a name="LSAME.162"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( VECT, <span class="string">'P'</span> ) ) THEN
         INFO = -1
      ELSE IF( .NOT.LEFT .AND. .NOT.<a name="LSAME.164"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( SIDE, <span class="string">'R'</span> ) ) THEN
         INFO = -2
      ELSE IF( .NOT.NOTRAN .AND. .NOT.<a name="LSAME.166"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( TRANS, <span class="string">'C'</span> ) ) THEN
         INFO = -3
      ELSE IF( M.LT.0 ) THEN
         INFO = -4
      ELSE IF( N.LT.0 ) THEN
         INFO = -5
      ELSE IF( K.LT.0 ) THEN
         INFO = -6
      ELSE IF( ( APPLYQ .AND. LDA.LT.MAX( 1, NQ ) ) .OR.
     $         ( .NOT.APPLYQ .AND. LDA.LT.MAX( 1, MIN( NQ, K ) ) ) )
     $          THEN
         INFO = -8
      ELSE IF( LDC.LT.MAX( 1, M ) ) THEN
         INFO = -11
      ELSE IF( LWORK.LT.MAX( 1, NW ) .AND. .NOT.LQUERY ) THEN
         INFO = -13
      END IF
<span class="comment">*</span><span class="comment">
</span>      IF( INFO.EQ.0 ) THEN
         IF( NW.GT.0 ) THEN
            IF( APPLYQ ) THEN
               IF( LEFT ) THEN
                  NB = <a name="ILAENV.188"></a><a href="hfy-index.html#ILAENV">ILAENV</a>( 1, <span class="string">'<a name="CUNMQR.188"></a><a href="cunmqr.f.html#CUNMQR.1">CUNMQR</a>'</span>, SIDE // TRANS, M-1, N, M-1,
     $                         -1 )
               ELSE
                  NB = <a name="ILAENV.191"></a><a href="hfy-index.html#ILAENV">ILAENV</a>( 1, <span class="string">'<a name="CUNMQR.191"></a><a href="cunmqr.f.html#CUNMQR.1">CUNMQR</a>'</span>, SIDE // TRANS, M, N-1, N-1,
     $                         -1 )
               END IF
            ELSE
               IF( LEFT ) THEN
                  NB = <a name="ILAENV.196"></a><a href="hfy-index.html#ILAENV">ILAENV</a>( 1, <span class="string">'<a name="CUNMLQ.196"></a><a href="cunmlq.f.html#CUNMLQ.1">CUNMLQ</a>'</span>, SIDE // TRANS, M-1, N, M-1,
     $                         -1 )
               ELSE
                  NB = <a name="ILAENV.199"></a><a href="hfy-index.html#ILAENV">ILAENV</a>( 1, <span class="string">'<a name="CUNMLQ.199"></a><a href="cunmlq.f.html#CUNMLQ.1">CUNMLQ</a>'</span>, SIDE // TRANS, M, N-1, N-1,
     $                         -1 )
               END IF
            END IF
            LWKOPT = MAX( 1, NW*NB )
         ELSE
            LWKOPT = 1
         END IF
         WORK( 1 ) = LWKOPT
      END IF
<span class="comment">*</span><span class="comment">
</span>      IF( INFO.NE.0 ) THEN
         CALL <a name="XERBLA.211"></a><a href="xerbla.f.html#XERBLA.1">XERBLA</a>( <span class="string">'<a name="CUNMBR.211"></a><a href="cunmbr.f.html#CUNMBR.1">CUNMBR</a>'</span>, -INFO )
         RETURN
      ELSE IF( LQUERY ) THEN
         RETURN
      END IF
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     Quick return if possible
</span><span class="comment">*</span><span class="comment">
</span>      IF( M.EQ.0 .OR. N.EQ.0 )
     $   RETURN
<span class="comment">*</span><span class="comment">
</span>      IF( APPLYQ ) THEN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">        Apply Q
</span><span class="comment">*</span><span class="comment">
</span>         IF( NQ.GE.K ) THEN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">           Q was determined by a call to <a name="CGEBRD.228"></a><a href="cgebrd.f.html#CGEBRD.1">CGEBRD</a> with nq &gt;= k
</span><span class="comment">*</span><span class="comment">
</span>            CALL <a name="CUNMQR.230"></a><a href="cunmqr.f.html#CUNMQR.1">CUNMQR</a>( SIDE, TRANS, M, N, K, A, LDA, TAU, C, LDC,
     $                   WORK, LWORK, IINFO )
         ELSE IF( NQ.GT.1 ) THEN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">           Q was determined by a call to <a name="CGEBRD.234"></a><a href="cgebrd.f.html#CGEBRD.1">CGEBRD</a> with nq &lt; k
</span><span class="comment">*</span><span class="comment">
</span>            IF( LEFT ) THEN
               MI = M - 1
               NI = N
               I1 = 2
               I2 = 1
            ELSE
               MI = M
               NI = N - 1
               I1 = 1
               I2 = 2
            END IF
            CALL <a name="CUNMQR.247"></a><a href="cunmqr.f.html#CUNMQR.1">CUNMQR</a>( SIDE, TRANS, MI, NI, NQ-1, A( 2, 1 ), LDA, TAU,
     $                   C( I1, I2 ), LDC, WORK, LWORK, IINFO )
         END IF
      ELSE
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">        Apply P
</span><span class="comment">*</span><span class="comment">
</span>         IF( NOTRAN ) THEN
            TRANST = <span class="string">'C'</span>
         ELSE
            TRANST = <span class="string">'N'</span>
         END IF
         IF( NQ.GT.K ) THEN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">           P was determined by a call to <a name="CGEBRD.261"></a><a href="cgebrd.f.html#CGEBRD.1">CGEBRD</a> with nq &gt; k
</span><span class="comment">*</span><span class="comment">
</span>            CALL <a name="CUNMLQ.263"></a><a href="cunmlq.f.html#CUNMLQ.1">CUNMLQ</a>( SIDE, TRANST, M, N, K, A, LDA, TAU, C, LDC,
     $                   WORK, LWORK, IINFO )
         ELSE IF( NQ.GT.1 ) THEN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">           P was determined by a call to <a name="CGEBRD.267"></a><a href="cgebrd.f.html#CGEBRD.1">CGEBRD</a> with nq &lt;= k
</span><span class="comment">*</span><span class="comment">
</span>            IF( LEFT ) THEN
               MI = M - 1
               NI = N
               I1 = 2
               I2 = 1
            ELSE
               MI = M
               NI = N - 1
               I1 = 1
               I2 = 2
            END IF
            CALL <a name="CUNMLQ.280"></a><a href="cunmlq.f.html#CUNMLQ.1">CUNMLQ</a>( SIDE, TRANST, MI, NI, NQ-1, A( 1, 2 ), LDA,
     $                   TAU, C( I1, I2 ), LDC, WORK, LWORK, IINFO )
         END IF
      END IF
      WORK( 1 ) = LWKOPT
      RETURN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     End of <a name="CUNMBR.287"></a><a href="cunmbr.f.html#CUNMBR.1">CUNMBR</a>
</span><span class="comment">*</span><span class="comment">
</span>      END

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