"Graph is a completely free program which may take arbitrary functions and display their values in the complex plane using domain coloring. This is a helpful technique because it makes many abstract concepts from complex analysis quite visual, and breathtakingly aesthetic.
Whether your interest in this program is from a mathematical standpoint, an artistic one, or as a fractal enthusiast, you'll find that Graph is a versatile tool which is likely meet your needs. I had originally developed the program out of frustration of the often very limited capability of the multitudes of fractal programs out there to allow versatility in both mathematics and graphics. Graph is a work which tries to overcome this inhibition."
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.