clantp.f.html

来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 311 行 · 第 1/2 页

   80          CONTINUE
            END IF
         END IF
      ELSE IF( ( <a name="LSAME.141"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( NORM, <span class="string">'O'</span> ) ) .OR. ( NORM.EQ.<span class="string">'1'</span> ) ) THEN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">        Find norm1(A).
</span><span class="comment">*</span><span class="comment">
</span>         VALUE = ZERO
         K = 1
         UDIAG = <a name="LSAME.147"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( DIAG, <span class="string">'U'</span> )
         IF( <a name="LSAME.148"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( UPLO, <span class="string">'U'</span> ) ) THEN
            DO 110 J = 1, N
               IF( UDIAG ) THEN
                  SUM = ONE
                  DO 90 I = K, K + J - 2
                     SUM = SUM + ABS( AP( I ) )
   90             CONTINUE
               ELSE
                  SUM = ZERO
                  DO 100 I = K, K + J - 1
                     SUM = SUM + ABS( AP( I ) )
  100             CONTINUE
               END IF
               K = K + J
               VALUE = MAX( VALUE, SUM )
  110       CONTINUE
         ELSE
            DO 140 J = 1, N
               IF( UDIAG ) THEN
                  SUM = ONE
                  DO 120 I = K + 1, K + N - J
                     SUM = SUM + ABS( AP( I ) )
  120             CONTINUE
               ELSE
                  SUM = ZERO
                  DO 130 I = K, K + N - J
                     SUM = SUM + ABS( AP( I ) )
  130             CONTINUE
               END IF
               K = K + N - J + 1
               VALUE = MAX( VALUE, SUM )
  140       CONTINUE
         END IF
      ELSE IF( <a name="LSAME.181"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( NORM, <span class="string">'I'</span> ) ) THEN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">        Find normI(A).
</span><span class="comment">*</span><span class="comment">
</span>         K = 1
         IF( <a name="LSAME.186"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( UPLO, <span class="string">'U'</span> ) ) THEN
            IF( <a name="LSAME.187"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( DIAG, <span class="string">'U'</span> ) ) THEN
               DO 150 I = 1, N
                  WORK( I ) = ONE
  150          CONTINUE
               DO 170 J = 1, N
                  DO 160 I = 1, J - 1
                     WORK( I ) = WORK( I ) + ABS( AP( K ) )
                     K = K + 1
  160             CONTINUE
                  K = K + 1
  170          CONTINUE
            ELSE
               DO 180 I = 1, N
                  WORK( I ) = ZERO
  180          CONTINUE
               DO 200 J = 1, N
                  DO 190 I = 1, J
                     WORK( I ) = WORK( I ) + ABS( AP( K ) )
                     K = K + 1
  190             CONTINUE
  200          CONTINUE
            END IF
         ELSE
            IF( <a name="LSAME.210"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( DIAG, <span class="string">'U'</span> ) ) THEN
               DO 210 I = 1, N
                  WORK( I ) = ONE
  210          CONTINUE
               DO 230 J = 1, N
                  K = K + 1
                  DO 220 I = J + 1, N
                     WORK( I ) = WORK( I ) + ABS( AP( K ) )
                     K = K + 1
  220             CONTINUE
  230          CONTINUE
            ELSE
               DO 240 I = 1, N
                  WORK( I ) = ZERO
  240          CONTINUE
               DO 260 J = 1, N
                  DO 250 I = J, N
                     WORK( I ) = WORK( I ) + ABS( AP( K ) )
                     K = K + 1
  250             CONTINUE
  260          CONTINUE
            END IF
         END IF
         VALUE = ZERO
         DO 270 I = 1, N
            VALUE = MAX( VALUE, WORK( I ) )
  270    CONTINUE
      ELSE IF( ( <a name="LSAME.237"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( NORM, <span class="string">'F'</span> ) ) .OR. ( <a name="LSAME.237"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( NORM, <span class="string">'E'</span> ) ) ) THEN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">        Find normF(A).
</span><span class="comment">*</span><span class="comment">
</span>         IF( <a name="LSAME.241"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( UPLO, <span class="string">'U'</span> ) ) THEN
            IF( <a name="LSAME.242"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( DIAG, <span class="string">'U'</span> ) ) THEN
               SCALE = ONE
               SUM = N
               K = 2
               DO 280 J = 2, N
                  CALL <a name="CLASSQ.247"></a><a href="classq.f.html#CLASSQ.1">CLASSQ</a>( J-1, AP( K ), 1, SCALE, SUM )
                  K = K + J
  280          CONTINUE
            ELSE
               SCALE = ZERO
               SUM = ONE
               K = 1
               DO 290 J = 1, N
                  CALL <a name="CLASSQ.255"></a><a href="classq.f.html#CLASSQ.1">CLASSQ</a>( J, AP( K ), 1, SCALE, SUM )
                  K = K + J
  290          CONTINUE
            END IF
         ELSE
            IF( <a name="LSAME.260"></a><a href="lsame.f.html#LSAME.1">LSAME</a>( DIAG, <span class="string">'U'</span> ) ) THEN
               SCALE = ONE
               SUM = N
               K = 2
               DO 300 J = 1, N - 1
                  CALL <a name="CLASSQ.265"></a><a href="classq.f.html#CLASSQ.1">CLASSQ</a>( N-J, AP( K ), 1, SCALE, SUM )
                  K = K + N - J + 1
  300          CONTINUE
            ELSE
               SCALE = ZERO
               SUM = ONE
               K = 1
               DO 310 J = 1, N
                  CALL <a name="CLASSQ.273"></a><a href="classq.f.html#CLASSQ.1">CLASSQ</a>( N-J+1, AP( K ), 1, SCALE, SUM )
                  K = K + N - J + 1
  310          CONTINUE
            END IF
         END IF
         VALUE = SCALE*SQRT( SUM )
      END IF
<span class="comment">*</span><span class="comment">
</span>      <a name="CLANTP.281"></a><a href="clantp.f.html#CLANTP.1">CLANTP</a> = VALUE
      RETURN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     End of <a name="CLANTP.284"></a><a href="clantp.f.html#CLANTP.1">CLANTP</a>
</span><span class="comment">*</span><span class="comment">
</span>      END

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