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<p>Class constructor. </p>
<p>Constructs an object of type pwr. Example: </p><div class="fragment"><div class="line">P1 = <a class="code" href="classpwr.html#a206af127b867c41215a106449d34f571">pwr</a>(50, 0);</div><div class="line">P2 = <a class="code" href="classpwr.html#a206af127b867c41215a106449d34f571">pwr</a>(50, {1, <span class="stringliteral">&#39;mw&#39;</span>});</div><div class="line">P3 = <a class="code" href="classpwr.html#a206af127b867c41215a106449d34f571">pwr</a>({1e5, <span class=