<p>In <a href="https://github.com/mlpack/mlpack/pull/374#discussion-diff-22746913">src/mlpack/methods/matrix_completion/matrix_completion.hpp</a>:</p>
<pre style='color:#555'>&gt; +   * @param m Number of rows of original matrix.
&gt; +   * @param n Number of columns of original matrix.
&gt; +   * @param indices Matrix containing the indices of the known entries (must be
&gt; +   *    [2 x p]).
&gt; +   * @param values Vector containing the values of the known entries (must be
&gt; +   *    length p).
&gt; +   */
&gt; +  MatrixCompletion(const size_t m,
&gt; +                   const size_t n,
&gt; +                   const arma::umat&amp; indices,
&gt; +                   const arma::vec&amp; values);
&gt; +
&gt; +  /**
&gt; +   * Solve the underlying SDP to fill in the remaining values.
&gt; +   */
&gt; +  void Recover();
</pre>
<p><code>void Recover(arma::mat&amp; output)</code> seems reasonable. Give me a day or two to think about CF. I'll either decide to put it aside for a separate pull request, or refactor it right away. </p>

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