<p>In <a href="https://github.com/mlpack/mlpack/pull/716#discussion_r69672305">src/mlpack/methods/pca/pca_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -33,10 +35,10 @@ PCA&lt;DecompositionPolicy&gt;::PCA(const bool scaleData,
&gt;   * @param coeff - PCA Loadings/Coeffs/EigenVectors
&gt;   */
&gt;  template&lt;typename DecompositionPolicy&gt;
&gt; -void PCA&lt;DecompositionPolicy&gt;::Apply(const arma::mat&amp; data,
&gt; -                arma::mat&amp; transformedData,
&gt; -                arma::vec&amp; eigVal,
&gt; -                arma::mat&amp; coeff)
&gt; +void PCAType&lt;DecompositionPolicy&gt;::Apply(const arma::mat&amp; data,
&gt; +                                         arma::mat&amp; transformedData,
&gt; +                                         arma::vec&amp; eigVal,
&gt; +                                         arma::mat&amp; coeff)
</pre>
<p>This parameter should call "eigvec" or "coeff", they are different in pca.hpp and pca_impl.hpp</p>

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