
<A NAME=add_columns>

<TITLE>add_columns</TITLE></A>
<b><a href=r37_idx.html>INDEX</a></b><p><p>



<B>ADD_COLUMNS</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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Add columns, add rows: 
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syntax: </H3>
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<em>add_columns</em>(&lt;matrix&gt;,&lt;c1&gt;,&lt;c2&gt;,&lt;expr&gt;) 
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&lt;matrix&gt; :- a 
<A HREF=r37_0345.html>matrix</A>. 
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&lt;c1&gt;,&lt;c2&gt; :- positive integers. 
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&lt;expr&gt; :- a scalar expression. 
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The Operator <em>add_columns</em> replaces column &lt;\meta{c2&gt;} of 
&lt;matrix&gt; by &lt;expr&gt; * column(&lt;matrix&gt;,&lt;c1&gt;) + 
column(&lt;matrix&gt;,&lt;c2&gt;). 
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<em>add_rows</em>performs the equivalent task on the rows of 
&lt;matrix&gt;. 
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 <P> <H3> 
examples: </H3>
<P><PRE><TT>

add_columns(A,1,2,x); 

  [1   x + 2   3]
  [             ]
  [4  4*x + 5  6]
  [             ]
  [7  7*x + 8  9]



add_rows(A,2,3,5); 

  [1   2   3 ]
  [          ]
  [4   5   6 ]
  [          ]
  [27  33  39]

</TT></PRE><P>Related functions: 
<A HREF=r37_0574.html>add_to_columns</A>, 

<A HREF=r37_0575.html>add_to_rows</A>, 
<A HREF=r37_0603.html>mult_columns</A>, 

<A HREF=r37_0604.html>mult_rows</A>. 
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