 and
negative differences.</p>
<p>$$\theta_{a,b,r} = \sum_d \phi_{d,r} * 1(a-b == d)$$</p>
    </div>
    <div id="-free-">
    <h2>'free'</h2>
    

<p>No additional restriction, all parameters other than \(\theta_{0,0,r}\)
vary freely.</p>
    </div>
    <div id="see-also">
    <h2>See also</h2>
    <div class="dont-index"><p><code><a href="../articles/mrf2d-family.html">vignette("mrf2d-family", package = "mrf2d")</a></code></p>
<p>A paper with detailed description of the package can be found at
doi: <a h