GRAPHPREC: Command to set the default graphing interval precision for
graphing functions which defaults to .0001 if not explicitly set.

syntax: GRAPHPREC=.fv, where .fv is a floating point value less than .02

Command to adjust the graphing interval precision value in cases where the user wants to decrease the interval precsion to a lower value to speed up the graphing function by increasing the precision between graph intervals as a trade off or in cases where the user wants to increase the interval precsion to a higher value to get a more detailed graph of an equation by performing more and longer graphing calculations. This value cannot be adjusted greater than or equal to .02 otherwise it is ignored. NOTE: algorithm for finding the graphing interval may adjust to a larger and less precise interval value if overflow conditions are encountered.