File r37/lisp/csl/html/r37_0603.html artifact bbc3c4a5d0 part of check-in 808e24217a

<A NAME=mult_columns>

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



<B>MULT_COLUMNS</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
<P>
 
Mult columns, mult rows: 
<P>
<P>
 <P> <H3> 
syntax: </H3>
<em>mult_columns</em>(&lt;matrix&gt;,&lt;column\_list&gt;,&lt;expr&gt;) 
<P>
<P>
<P>
&lt;matrix&gt; :- a 
<A HREF=r37_0345.html>matrix</A>. 
<P>
<P>
&lt;column\_list&gt; :- a positive integer or a list of positive 
 integers. 
<P>
<P>
&lt;expr&gt; :- an algebraic expression. 
<P>
<P>
<em>mult_columns</em>returns a copy of &lt;matrix&gt; in which the 
columns specified in &lt;column\_list&gt; have been multiplied by 
&lt;expr&gt;. 
<P>
<P>
<em>mult_rows</em>performs the same task on the rows of &lt;matrix&gt;. 
<P>
<P>
 <P> <H3> 
examples: </H3>
<P><PRE><TT>

mult_columns(A,{1,3},x); 

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



mult_rows(A,2,10); 

  [1   2   3 ]
  [          ]
  [40  50  60]
  [          ]
  [7   8   9 ]

</TT></PRE><P>Related functions: 
<A HREF=r37_0574.html>add_to_columns</A>, 
<A HREF=r37_0575.html>add_to_rows</A>. 
<P>
<P>