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<p>&nbsp;<p>
<hr noshade size="5">
<h2><a name="Eval"></a>
Eval
</h2>

Evaluates a polynomial at a value.

<p><p>

<h3>
Syntax:
</h3>
<pre>y := Eval(f, s);</pre>

<p>

<table>
<tr>
<td></td>
<td><pre>  y  </pre></td>
<td></td>
</tr>
<tr>
<td>polynomial</td>
<td><pre>  f  </pre></td>
<td></td>
</tr>
<tr>
<td></td>
<td><pre>  s  </pre></td>
<td></td>
</tr>
</table>

<p>


<h3>
Description:
</h3>
This function assumes that the arithmetic with elements of
the coefficient ring of the polynomial algebra of <tt> f</tt> and <tt> s</tt>
is defined.

<p><p>

<p>
<hr>
<p>
<h3>
Example:
</h3>
First we create a polynomial (over Z): 
<pre>

kash> f := x^2+2*x+1;
x^2 + 2*x + 1


</pre>

<p>

<p>
<hr>
<p>
<h3>
Example:
</h3>

Now we want to evalute it at 2 and \pi: 
<pre>

kash> Eval(f, 2);
9
kash> Eval(f, pi);
17.15278970826894509575977776643515690370803820599

</pre>

<p>

<p>
<hr>
<p>
<h3>
Example:
</h3>

Finally, we want to substitute x by x+1: 
<pre>

kash> Eval(f, x+1);
> x^2 + 4*x + 4

</pre>

<p>


<hr>

<p>
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