title: Exclude data in gnuplot with a condition
body: <p>I have a data file with 3 column and I want to plot with 2 of them. But I want to use the third with a condition to exclude or not the line from the plot (For example, if $3 &lt; 10 the data line isn't valid). I know there is set datafile missing but this case is somewhat peculiar and I don't know how to do that. Any help is appreciated...</p>