File r37/lisp/csl/html/r37_0088.html artifact 1c7b50a6e0 part of check-in 1b32ca91d4

<A NAME=LOG>

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



<B>LOG</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
<P>
 
 <P>
<P>
The <em>log</em> operator returns the natural logarithm of its argument. 
 <P> <H3> 
syntax: </H3>
<P>
<P>
<em>log</em>(&lt;expression&gt;) or <em>log</em> &lt;expression&gt; 
<P>
<P>
<P>
&lt;expression&gt; can be any valid scalar REDUCE expression. 
<P>
<P>
 <P> <H3> 
examples: </H3>
<P><PRE><TT>
log(x); 

  LOG(X) 


log 4; 

  LOG(4) 


log(e); 

  1 


on rounded; 

log 4; 

  1.38629436112

</TT></PRE><P><em>log</em>returns a numeric value only when 
<A HREF=r37_0330.html>rounded</A> is on. In that 
case, use of a negative argument for <em>log</em> results in an error 
message. No error is given on a negative argument when REDUCE is not in 
that mode. 
<P>
<P>
<P>