title: Testing inequalities on lists
body: <p>I have tried several different ways using different list primitives, but cannot find a way to test an inequality for each item of a list. For example, my list <code>[1 2 -1 -2]</code> could be tested for > 0, and give <code>[1 2 0 0 ]</code>. Can someone please help with this simple task. </p>