With gPlot++ your PSP will be now a function plotter.
Developer GeeckoDev has just released a new homebrew app for your Psp: gPlot++.
gPlot++ is a function plotter for your Psp. With it, you can plot and display 4 concurrent functions and allows you to move them around using zoom and panning. You can also output an array of predefined functions such as the trigonometric ones. You can even use it as a graphic calculator. If you use this kind of functions it could be useful to you.