title: gnuplot command every on row only
body: <p>I have a matrix listed in a <code>.csv</code> file of approximately 0.6 mio datapoints I would like to visualize in a 3d plot. Since my computer showed troubles with the amount of data I evolved the command line from:</p>
  
  <pre><code>splot "file.csv" matrix w pm3d
  </code></pre>
  
  <p>to</p>
  
  <pre><code>splot "file.csv" matrix every 5::50::3000 w pm3d
  </code></pre>
  
  <p>My intention was to only plot from row 50 to 3000 using only every 5th row. A row contains 100 columns btw. The command however cut the first 50 rows and columns, using every 5th row and column and ended in with line 3500.</p>
  
  <p>How do I use the every command on my rows only?</p>
  
  <p>I also tried to combine the using command with the every command in order to define my row with the every command but I couldn't get it to work properly.</p>