<p>In <a href="https://github.com/mlpack/mlpack/pull/680#discussion_r66188192">src/mlpack/methods/emst/emst_main.cpp</a>:</p>
<pre style='color:#555'>> @@ -34,8 +34,8 @@ PROGRAM_INFO("Fast Euclidean Minimum Spanning Tree", "This program can compute "
> "column corresponds to the distance between the two points.");
>
> PARAM_STRING_REQ("input_file", "Data input file.", "i");
> -PARAM_STRING("output_file", "Data output file. Stored as an edge list.", "o",
> - "emst_output.csv");
> +PARAM_STRING_REQ("output_file", "Data output file. Stored as an edge list.",
> + "o");
</pre>
<p>We shouldn't require the user to specify and output file, but we should print a warning ("output will not be saved", I think mlpack_knn does this) if they don't specify -o.</p>
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