appendix hcomplete programs the plotdata program this is the plot program that is used throughout the text to plot experimentally gathered data so it can be visualized this program can be downloaded from the text' website import import import import import import import turtle tkinter colorchooser tkinter filedialog xml dom minidom math sys frame def =none =none super self datafile datafile pack buildwindow def buildwindow master menu menu bar def =none =none filename askopenfilename = et penup goto pendown update et color black xmldoc xml dom minidom xmldoc getelementsbytagname plotelement master value getelementsbytagname axes getelementsbytagname xaxiselement data getelementsbytagname yaxiselement data xattr xaxiselement yattr yaxiselement minx maxx miny maxy min max min max maxx minx maxy miny minx miny this copy belongs to 'acha