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    <h1>trend.line</h1>
    <small class="dont-index">Source: <a href='https://github.com/jeffreyevans/spatialEco/blob/master/R/trend.line.R'><code>R/trend.line.R</code></a></small>
    <div class="hidden name"><code>trend.line.Rd</code></div>
    </div>

    <div class="ref-description">
    <p>Calculated specified trend line of x,y</p>
    </div>

    <pre class="usage"><span class='fu'>trend.line</span><span class='op'>(</span><span class='va'>x</span>, <span class='va'>y</span>, type <span class='op'>=</span> <span class='st'>"linear"</span>, plot <span class='op'>=</span> <span class='cn'>TRUE</span>, <span class='va'>...</span><span class='op'>)</span></pre>

    <h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
    <table class="ref-arguments">
    <colgroup><col class="name" /><col class="desc" /></colgroup>
    <tr>
      <th>x</th>
      <td><p>Vector of x</p></td>
    </tr>
    <tr>
      <th>y</th>
      <td><p>Vector of y</p></td>
    </tr>
    <tr>
      <th>type</th>
      <td><p>Trend line types are: 'linear', 'exponential',
'logarithmic', 'polynomial'</p></td>
    </tr>
    <tr>
      <th>plot</th>
      <td><p>plot results (TRUE/FALSE)</p></td>
    </tr>
    <tr>
      <th>...</th>
      <td><p>Additional arguments passed to plot</p></td>
    </tr>
    </table>

    <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>

    <p>A list class object with the following components:</p><ul>
<li><p>for type = 'linear'  x is slope and y is intercept</p></li>
<li><p>for type = 'exponential', 'logarithmic', or 'polynomial'
x is original x variable and y is vector of fit
regression line</p></li>
</ul>

    <h2 class="hasAnchor" id="author"><a class="anchor" href="#author"></a>Author</h2>

    <p>Jeffrey S. Evans  <a href='mailto:jeffrey_evans@tnc.org'>jeffrey_evans@tnc.org</a></p>

    <h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
    <pre class="examples"><div class='input'><span class='va'>x</span> <span class='op'>&lt;-</span> <span class='fl'>1</span><span class='op'>:</span><span class='fl'>10</span>
<span class='va'>y</span> <span class='op'>&lt;-</span> <span class='fu'><a href='https://rdrr.io/r/base/jitter.html'>jitter</a></span><span class='op'>(</span><span class='va'>x</span><span class='op'>^</span><span class='fl'>2</span><span class='op'>)</span>

<span class='va'>opar</span> <span class='op'>&lt;-</span> <span class='fu'><a href='https://rdrr.io/r/graphics/par.html'>par</a></span><span class='op'>(</span>no.readonly<span class='op'>=</span><span class='cn'>TRUE</span><span class='op'>)</span>
  <span class='fu'><a href='https://rdrr.io/r/graphics/par.html'>par</a></span><span class='op'>(</span>mfcol<span class='op'>=</span><span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span><span class='op'>(</span><span class='fl'>2</span>,<span class='fl'>2</span><span class='op'>)</span><span class='op'>)</span>
    <span class='fu'>trend.line</span><span class='op'>(</span><span class='va'>x</span>,<span class='va'>y</span>,type<span class='op'>=</span><span class='st'>'linear'</span>,plot<span class='op'>=</span><span class='cn'>TRUE</span>,pch<span class='op'>=</span><span class='fl'>20</span>,main<span class='op'>=</span><span class='st'>'Linear'</span><span class='op'>)</span>
</div><div class='output co'>#&gt; $x
#&gt; [1] -21.9637
#&gt; 
#&gt; $y
#&gt; [1] 10.99748
#&gt; </div><div class='input'>    <span class='fu'>trend.line</span><span class='op'>(</span><span class='va'>x</span>,<span class='va'>y</span>,type<span class='op'>=</span><span class='st'>'exponential'</span>,plot<span class='op'>=</span><span class='cn'>TRUE</span>,pch<span class='op'>=</span><span class='fl'>20</span>,main<span class='op'>=</span><span class='st'>'Exponential'</span><span class='op'>)</span>
</div><div class='output co'>#&gt; $x
#&gt;  [1]  1  2  3  4  5  6  7  8  9 10
#&gt; 
#&gt; $y
#&gt;  [1]   7.923561  10.557305  14.066489  18.742105  24.971866  33.272363
#&gt;  [7]  44.331894  59.067546  78.701239 104.861052
#&gt; </div><div class='input'>    <span class='fu'>trend.line</span><span class='op'>(</span><span class='va'>x</span>,<span class='va'>y</span>,type<span class='op'>=</span><span class='st'>'logarithmic'</span>,plot<span class='op'>=</span><span class='cn'>TRUE</span>,pch<span class='op'>=</span><span class='fl'>20</span>,main<span class='op'>=</span><span class='st'>'Logarithmic'</span><span class='op'>)</span>
</div><div class='output co'>#&gt; $x
#&gt;  [1]  1  2  3  4  5  6  7  8  9 10
#&gt; 
#&gt; $y
#&gt;  [1] -22.355830   5.581428  21.923676  33.518686  42.512474  49.860934
#&gt;  [7]  56.073968  61.455943  66.203182  70.449731
#&gt; </div><div class='input'>    <span class='fu'>trend.line</span><span class='op'>(</span><span class='va'>x</span>,<span class='va'>y</span>,type<span class='op'>=</span><span class='st'>'polynomial'</span>,plot<span class='op'>=</span><span class='cn'>TRUE</span>,pch<span class='op'>=</span><span class='fl'>20</span>,main<span class='op'>=</span><span class='st'>'Polynomial'</span><span class='op'>)</span>
</div><div class='img'><img src='trend.line-1.png' alt='' width='700' height='433' /></div><div class='output co'>#&gt; $x
#&gt;  [1]  1  2  3  4  5  6  7  8  9 10
#&gt; 
#&gt; $y
#&gt;  [1]  0.7344235  3.9314696  9.0786230 16.1758838 25.2232519 36.2207274
#&gt;  [7] 49.1683102 64.0660003 80.9137978 99.7117026
#&gt; </div><div class='input'> <span class='fu'><a href='https://rdrr.io/r/graphics/par.html'>par</a></span><span class='op'>(</span><span class='va'>opar</span><span class='op'>)</span>

</div></pre>
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