Ok, Given that Excel isn't the right tool to plot something (except when you are lazy, or it is convenient, or ..., what is the right tool these days? Matlab? GnuPlot? Something Else?

When I was a student, I used Mathematica, and prior to that a proprietary tool written by and for the physics department that did linear regression and handled error-bars nicely. At work we use a an in-house tool that handles nicely 100,000 to 10 million points nicely, but doesn't have anything else going for it.

So what do "real" engineers use these days?

W