title: R - Subset rows of a data frame on a condition in all the columns
body: <p>I want to subset rows of a data frame on a single condition in all the columns, avoiding the use of <code>subset</code>.</p>
  
  <p>I understand how to subset a single column but I cannot generalize for all columns (without call all the columns).</p>
  
  <p>Initial data frame :</p>
  
  <pre><code>  V1 V2 V3
  1  1  8 15
  2  2  0 16
  3  3 10 17
  4  4 11 18
  5  5  0 19
  6  0 13 20
  7  7 14 21
  </code></pre>
  
  <p>In this example, I want to subset the rows without zeros.</p>
  
  <p>Expected output :</p>
  
  <pre><code>  V1 V2 V3
  1  1  8 15
  2  3 10 17
  3  4 11 18
  4  7 14 21
  </code></pre>
  
  <p>Thanks</p>