A number of people have asked about submitting assignments and how it is to be done, whether through a hard copy handed in to the TA's, or electronically. The official line is that a hard copy can be turned in and accepted, and will count. But if you still want to submit it electronically, you have 2 options.
Either use xfig and submit the output file electronically to the TA, or use some other drawing program with which you are familiar. If you do the latter, you must save the output file as either a GIF or a PostScript file. If you submit it electronically, we still want you to hand in a hard copy in case something happens.