title: R subsetting data according to non zeros in row
body: <p>I have a dataset like this:</p>
  
  <pre><code>     1    2    3    4    5
  
  1    1    0    0    0    0
  
  2    1    0    0    2    0
  
  3    0    0    0    1    5
  
  4    2    0    0    0    0
  </code></pre>
  
  <p>I want to subset the rows with more than one column beeing non-zero (means rows 2,3)</p>
  
  <p>I know that it has to be something like <strong>dataset[... dataset ...]</strong> but I did not find out how to access rows as such without using a for-loop</p>