'op'>$</span><span class='va'>x</span> <span class='op'>+</span> <span class='va'>allcoef</span><span class='op'>$</span><span class='va'>Q</span><span class='op'>[</span><span class='va'>i</span><span class='op'>]</span> <span class='op'>*</span> <span class='va'>out</span><span class='op'>$</span><span class='va'>x</span><span class='op'>^</span><span class='fl'>2</span>,
    sd <span class='op'>=</span> <span class='fl'>.1</span><span class='op'>)</span>
  <span class='kw'><a href='https://rdrr.io/r/base