mputes the output of a wheatstone bridge where two strain gages are placed in series in each leg. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">fg</td><td>The gage factor of each strain gage [1a, 1b, ... 4a, 4b]. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">r</td><td>The resistance of each strain gage [1a, 1b, ... 4a, 4b]. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">str