What simple plotting software would you recommend?
I have a second year undergraduate student working with me on a research project. He needs to start producing some simple plots of one dimensional graphs, of publication quality. The plots will be of comparable complexity/simplicity to the figure below. What freeware would you recommend? There is a long list of options on Wikipedia. The main criteria are -free -can be used on a PC and a Mac - easy to learn and to use The figure is from this paper.