floorIVUSGS</a></span><span class="op">(</span><span class="va">yaak_river_dv</span><span class="op">)</span></span>
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<span class="r-in"><span class="co">#change floor method</span></span>
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<span class="r-in"><span class="va">yaak_river_iv</span> <span class="op">&lt;-</span> <span class="fu"><a href="ww_floorIVUSGS.html">ww_floorIVUSGS</a></span><span class="op">(</span><span class="va">yaak_river_dv</span>,</span>
<span class="r-in">                     