Same here. I was a somewhat heavy user of gnuplot and Grace (http://plasma-gate.weizmann.ac.il/Grace/ http://plasma-gate.weizmann.ac.il/Grace/ , anybody remembe

Same here. I was a somewhat heavy user of gnuplot and Grace (http://plasma-gate.weizmann.ac.il/Grace/ http://plasma-gate.weizmann.ac.il/Grace/ , anybody remember that one, heh?), but what caused me to abandon them was that I needed much more than a plotting program. I made myself a python-based workflow/analysis environment, where I slurped in the results of simulations, did various munging on the data, some (somewhat custom) regression fits, generation of input data to other simulations etc. And yes, on-screen and later on publication quality plots too. matplotlib was a godsend here, really. Sure, I could have coded up some gnuplot/grace interface (say, generate input files and shelling out to the program), but, ugh, why?