You can also create your own rules to the data in Vect. In Convert Data panel, there is a rule under Insert Button, called "To write simple Perl code to convert data from other rule."

If you select the Perl code rule, and give it a name, it will bring a new rule to the Convert Data panel.

If you click on user rule, it will bring up a new window. There are already some simple perl scripts written in it. So, go ahead put in the data for input 1 and input 2. The data should looks like this:

You can write your own Perl script in user rule, look for other documents for more information about using perl. Let's say if you want to calculate the average of rule <15LessData>, here is an example of how to write such perl script.

The results are: