span></dt><dd><code>f</code> - the integer data array to be transformed (signal)</dd>
<dt><span class="strong">Returns:</span></dt><dd>the integer transformed array (spectrum)</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/commons/math3/exception/MathIllegalArgumentException.html" title="class in org.apache.commons.math3.exception">MathIllegalArgumentException</a></code> - if the length of the data array is not a power of two</dd></dl>
</li>
</ul>
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