<p>You're right, that makes sense to save things as a single column, not a single row.  I made a change in  <a href="https://github.com/mlpack/mlpack/commit/5aaf0e441dd64a5de9a0210aa7a837eecf162d12" class="commit-link"><tt>5aaf0e4</tt></a> so you can update your code and rebuild, or you can modify your existing file with this quick command: <code>cat output.csv | tr ' ' '\n'</code>.  Thanks for pointing this out!</p>

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