File r37/lisp/csl/html/r37_0453.html artifact 6f584c4bbb part of check-in 2f3b3fd537

<A NAME=HANKEL1>

<TITLE>HANKEL1</TITLE></A>
<b><a href=r37_idx.html>INDEX</a></b><p><p>



<B>HANKEL1</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
<P>
 
The <em>Hankel1</em> operator returns the Hankel function of the first kind. 
<P>
<P>
 <P> <H3> 
syntax: </H3>
<em>Hankel1</em>(&lt;order&gt;,&lt;argument&gt;) 
<P>
<P>
<P>
 <P> <H3> 
examples: </H3>
<P><PRE><TT>
on complex; 

Hankel1 (1/2,pi); 

  - i * sqrt(2) / pi 


Hankel1 (1,pi); 

  besselj(1,pi) + i*bessely(1,pi)

</TT></PRE><P>The operator <em>Hankel1</em> is also called Bessel function of th
e third kind. 
There is currently no numeric evaluation of Hankel functions. 
<P>
<P>
<P>