File r37/lisp/csl/html/r37_0514.html artifact 6782536fee part of check-in e1a8550313

<A NAME=ERF_extended>

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



<B>ERF EXTENDED</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
<P>
 
 <P>
<P>
The special function package supplies an extended support for the 

<A HREF=r37_0255.html>erf</A> operator which implements the <em>error function
</em> 
<P>
<P>
defint(e**(-x**2),x,0,infinity) * 2/sqrt(pi) 
<P>
<P>
. 
<P>
<P>
 <P> <H3> 
syntax: </H3>
<em>erf</em>(&lt;expression&gt;) 
<P>
<P>
<P>
 <P> <H3> 
examples: </H3>
<P><PRE><TT>
erf(-x); 

  - erf(x)


on rounded; 

erf(0.35); 

  0.379382053562

</TT></PRE><P>The numeric values for the operator <em>erf</em> are computed via 
the 
power series representation, which limits the argument range. 
<P>
<P>
<P>