formatting link
A couple things you can do to make life easier when using the excellent LTSpice simulator:
1) When you're happy with your equation in the Expression Editor copy and paste it into the schematic with a note.Example: Edit>Text>[CTRL-V of] V(N001,N002)*I(R1) ;Power into circuit. That way, you can copy and paste the equation back into the rawfile editor to see how power has changed without having to type it in for each simulation generation.
2) You can delete all of the uninteresting test points on the schematic by placing another test point and double-clicking instead of single-clicking. Only your new test point remains! This is way faster than deleting them individually in the rawfile editor.:)
--Winston