2D_grapher

draw_graph 1.0
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REQUIREMENTS: VMD Version 1.0 or greater
DESCRIPTION:
	draw_graph generates sample points of a function 'f' passed
	to it and then draws a smooth curve through those points.
	Arguments to draw graph include the name of the function, 
	a starting point for calculations, an ending point, and a
	step size between start and end to determine how many points
	will be used to form the curve. These parameters must be
	given in the order just specified.
	To start the user off, a sample function, called 'f' has been
	provided. You may want to just alter this function when
	plotting your own data to be sure that the syntax is correct.
	
PROCEDURES:
	f - definition of the function to graph
	draw_graph - calculates points of f and plots them
EXAMPLE USAGE:
	To plot the function f from -5 to 4 with a step
	 size of 0.2
		draw_graph f -5 4 0.2
EXAMPLE OUTPUT:
	Image of the parabolic function
	which is included with the script.	
DOWNLOAD FILE:
	2dgraph.tcl
AUTHOR:
	Andrew Dalke (dalke@ks.uiuc.edu)