<p>Hi,<br>
I mean something like this. With zero as value in a cell.<br>
<a href="https://github.com/mlpack/mlpack/files/42471/observationPKM.csv.txt">observationPKM.csv.txt</a><br>
or something like<br>
3 2 54 2 34 0 0 0 0 0 0 <br>
as first row. The columns with the zero will be ignored.</p>

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