dormbr.f.html

来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 306 行 · 第 1/2 页
HTML
306 行
</span><span class="comment">*</span><span class="comment">     .. Intrinsic Functions ..
</span>      INTRINSIC          MAX, MIN
<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.143"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( VECT, <span class="string">'Q'</span> )
      LEFT = <a name="LSAME.144"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( SIDE, <span class="string">'L'</span> )
      NOTRAN = <a name="LSAME.145"></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( .NOT.APPLYQ .AND. .NOT.<a name="LSAME.157"></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.159"></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.161"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( TRANS, <span class="string">'T'</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( APPLYQ ) THEN
            IF( LEFT ) THEN
               NB = <a name="ILAENV.182"></a><a href="hfy-index.html#ILAENV">ILAENV</a>( 1, <span class="string">'<a name="DORMQR.182"></a><a href="dormqr.f.html#DORMQR.1">DORMQR</a>'</span>, SIDE // TRANS, M-1, N, M-1,
     $              -1 )
            ELSE
               NB = <a name="ILAENV.185"></a><a href="hfy-index.html#ILAENV">ILAENV</a>( 1, <span class="string">'<a name="DORMQR.185"></a><a href="dormqr.f.html#DORMQR.1">DORMQR</a>'</span>, SIDE // TRANS, M, N-1, N-1,
     $              -1 )
            END IF
         ELSE
            IF( LEFT ) THEN
               NB = <a name="ILAENV.190"></a><a href="hfy-index.html#ILAENV">ILAENV</a>( 1, <span class="string">'<a name="DORMLQ.190"></a><a href="dormlq.f.html#DORMLQ.1">DORMLQ</a>'</span>, SIDE // TRANS, M-1, N, M-1,
     $              -1 )
            ELSE
               NB = <a name="ILAENV.193"></a><a href="hfy-index.html#ILAENV">ILAENV</a>( 1, <span class="string">'<a name="DORMLQ.193"></a><a href="dormlq.f.html#DORMLQ.1">DORMLQ</a>'</span>, SIDE // TRANS, M, N-1, N-1,
     $              -1 )
            END IF
         END IF
         LWKOPT = MAX( 1, NW )*NB
         WORK( 1 ) = LWKOPT
      END IF
<span class="comment">*</span><span class="comment">
</span>      IF( INFO.NE.0 ) THEN
         CALL <a name="XERBLA.202"></a><a href="xerbla.f.html#XERBLA.1">XERBLA</a>( <span class="string">'<a name="DORMBR.202"></a><a href="dormbr.f.html#DORMBR.1">DORMBR</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>      WORK( 1 ) = 1
      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="DGEBRD.220"></a><a href="dgebrd.f.html#DGEBRD.1">DGEBRD</a> with nq &gt;= k
</span><span class="comment">*</span><span class="comment">
</span>            CALL <a name="DORMQR.222"></a><a href="dormqr.f.html#DORMQR.1">DORMQR</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="DGEBRD.226"></a><a href="dgebrd.f.html#DGEBRD.1">DGEBRD</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="DORMQR.239"></a><a href="dormqr.f.html#DORMQR.1">DORMQR</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">'T'</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="DGEBRD.253"></a><a href="dgebrd.f.html#DGEBRD.1">DGEBRD</a> with nq &gt; k
</span><span class="comment">*</span><span class="comment">
</span>            CALL <a name="DORMLQ.255"></a><a href="dormlq.f.html#DORMLQ.1">DORMLQ</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="DGEBRD.259"></a><a href="dgebrd.f.html#DGEBRD.1">DGEBRD</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="DORMLQ.272"></a><a href="dormlq.f.html#DORMLQ.1">DORMLQ</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="DORMBR.279"></a><a href="dormbr.f.html#DORMBR.1">DORMBR</a>
</span><span class="comment">*</span><span class="comment">
</span>      END

</pre>

 </body>
</html>
dormbr.f.html - 源码说明

本页面展示了「famous linear algebra library (LAPACK) ports to windows」中的 dormbr.f.html 源码文件，采用 HTML 编程语言编写，共 306 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。
虫虫下载站收录了大量与algebra相关的技术资源，包括源代码、技术文档、电路图等，是电子工程师和嵌入式开发者的专业学习平台。
⌨️ 快捷键说明

复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?