File r37/lisp/csl/html/r37_0158.html artifact 7cfcb997ab part of check-in a57e59ec0d

<A NAME=LHS>

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



<B>LHS</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
<P>
 
 <P>
<P>
The <em>lhs</em> operator returns the left-hand side of an 
<A HREF=r37_0045.html>equation</A>, 
such as those 
returned in a list by 
<A HREF=r37_0179.html>solve</A>. 
 <P> <H3> 
syntax: </H3>
<P>
<P>
<em>lhs</em>(&lt;equation&gt;) or <em>lhs</em> &lt;equation&gt; 
<P>
<P>
<P>
<P>
&lt;equation&gt; must be an equation of the form 
<P>
<P>
<em>left-hand side</em><em>=</em><em>right-hand side</em>. 
<P>
<P>
 <P> <H3> 
examples: </H3>
<P><PRE><TT>
polly := (x+3)*(x^4+2x+1); 

            5      4      2
  POLLY := X  + 3*X  + 2*X  + 7*X + 3 


pollyroots := solve(polly,x); 

  POLLYROOTS := {X=ROOT F(X3 - X2 + X + 1,X ,
                       O                   )
                 X=-1,
                 X=-3}


variable := lhs first pollyroots; 

  VARIABLE := X

</TT></PRE><P>