File r37/lisp/csl/html/r37_0140.html artifact 8423e01360 part of check-in a57e59ec0d

<A NAME=ARGLENGTH>

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



<B>ARGLENGTH</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
<P>
 
 <P>
<P>
The operator <em>arglength</em> returns the number of arguments of the top-level
 
operator in its argument. 
<P>
<P>
 <P> <H3> 
syntax: </H3>
<em>arglength</em>(&lt;expression&gt;) 
<P>
<P>
<P>
&lt;expression&gt; can be any valid REDUCE algebraic expression. 
<P>
<P>
 <P> <H3> 
examples: </H3>
<P><PRE><TT>
arglength(a + b + c + d); 

  4 


arglength(a/b/c); 

  2 


arglength(log(sin(df(r**3*x,x)))); 


  1

</TT></PRE><P>In the first example, <em>+</em> is an n-ary operator, so the numb
er of terms 
is returned. In the second example, since <em>/</em> is a binary operator, the 
argument is actually (a/b)/c, so there are two terms at the top level. In 
the last example, no matter how deeply the operators are nested, there is 
still only one argument at the top level. 
<P>
<P>
<P>