<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r68706266">src/mlpack/core/data/imputation_methods/mean_imputation.hpp</a>:</p>
<pre style='color:#555'>&gt; +      for (size_t i = 0; i &lt; input.n_cols; ++i)
&gt; +      {
&gt; +        if (input(dimension, i) == mappedValue)
&gt; +        {
&gt; +          targets.push_back(std::make_pair(dimension, i));
&gt; +        }
&gt; +        else
&gt; +        {
&gt; +          elems++;
&gt; +          sum += input(i, dimension);
&gt; +        }
&gt; +      }
&gt; +    }
&gt; +
&gt; +    // calculate mean;
&gt; +    double mean = sum / elems;
</pre>
<p>updated</p>

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