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<A NAME=rows_pivot>

<TITLE>rows_pivot</TITLE></A>
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<B>ROWS_PIVOT</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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 <P> <H3> 
syntax: </H3>
<em>rows_pivot</em>(&lt;matrix&gt;,&lt;r&gt;,&lt;c&gt;,{&lt;row\_list&gt;}) 
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&lt;matrix&gt; :- a namerefmatrix. 
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&lt;r&gt;,&lt;c&gt; :- positive integers such that &lt;matrix&gt;(&lt;r&gt;, 
 &lt;c&gt;) neq 0. 
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&lt;row\_list&gt; :- positive integer or a list of positive integers. 
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<em>rows_pivot</em>performs the same task as <em>pivot</em> but applies 
the pivot only to the rows specified in &lt;row\_list&gt;. 
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 <P> <H3> 
examples: </H3>
<P><PRE><TT>

N := mat((1,2,3),(4,5,6),(7,8,9),(1,2,3),(4,5,6)); 


       [1  2  3]
       [       ]
       [4  5  6]
       [       ]
  n := [7  8  9]
       [       ]
       [1  2  3]
       [       ]
       [4  5  6]



rows_pivot(N,2,3,{4,5}); 

  [1     2     3]
  [             ]
  [4     5     6]
  [             ]
  [7     8     9]
  [             ]
  [      - 1    ]
  [-1  ------  0]
  [      2      ]
  [             ]
  [0     0     0]

</TT></PRE><P>Related functions: 
<A HREF=r37_0605.html>pivot</A>. 
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