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

Returns the argument of a complex number.

<p><p>

<h3>
Syntax:
</h3>
<pre>phi := Arg(z);</pre>

<p>

<table>
<tr>
<td>real</td>
<td><pre>  phi  </pre></td>
<td></td>
</tr>
<tr>
<td>complex</td>
<td><pre>  z  </pre></td>
<td></td>
</tr>
</table>

<p>


<h3>
Description:
</h3>
Returns \phi\in(-\pi,\pi] for z=|z|e^{i\phi}\inC.

<p><p>

<p>
<hr>
<p>
<h3>
Example:
</h3>
Compute the argument of i
<pre>

kash> z := Comp(0, 1);
1*i
kash> Arg(z);
1.570796326794896619231321691639751442098584699688


</pre>

<p>

<p>
<hr>
<p>
<h3>
Example:
</h3>
Compute the argument of -1
<pre>

kash> z := Comp(-1, 0);
-1
kash> Arg(z);
> 3.141592653589793238462643383279502884197169399375

</pre>

<p>


<hr>

<p>
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