Excel - plot for multiple values of x

[scooterscot]

Sorry Yes, exactly. It takes a while to learn, since it's all script-based, but it's incredibly powerful and widely used, with an excellent user/support community. It's pretty much the standard for statistical computing (the proprietary equivalent of the R language is S-plus in case that rings any bells..).

Already getting results using R. Like Matlab, sort of. Feels intuitive. Good recommend, thanks..

[jamesbrown]

Yes, if you come from a Matlab background it should be no problem at all. It can be infuriating sometimes, but it's extremely powerful (aside from the base packages, there are hundreds of contributed packages) and, perhaps most importantly, has a very large user base and good online documentation. See ?points to add other datasets to the same plot. Anyway, good luck and I hope if works out for you.