n><span class="fu">thaw</span><span class="op">(</span><span class="va">input</span>, <span class="va">frozen</span><span class="op">)</span></span></code></pre></div>
    </div>

    <div id="details">
    <h2>Details</h2>
    <p>A frozen matrix specifies which variables to fix in a projection matrix.
Warm variables should be missing (<code>NA</code>) while frozen variables should
be set to their fixed values.</p>
    </div>

    <div id="ref-examples">
    <h2>Examples</h2>
    <div class="sourceCode"><pr