Texas Instruments TI89TITANIUM User Manual - Page 419
The fldpic System Variable, Exploring a Graph
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Standard values (set when you select 6:ZoomStd from the „ Zoom toolbar menu) are: t0 = 0. tmax = 10. tstep = .1 tplot = 0. xmin = L1. xmax = 10. xscl = 1. ymin = L10. ymax = 10. yscl = 1. ncurves = 0. diftol = .001 Estep = 1. fldres = 14. dtime = 0. You may need to change the standard values for the t variables to ensure that sufficient points are plotted. The fldpic System Variable When a slope or direction field is drawn, a picture of the field is stored automatically to a system variable named fldpic. If you perform an operation that regraphs the plotted equations but does not affect the field, the TI-89 Titanium reuses the picture in fldpic instead of having to redraw the field. This can speed up the regraphing time significantly. fldpic is deleted automatically when you exit the differential equation graphing mode or when you display a graph with Fields = FLDOFF. Exploring a Graph As in function graphing, you can explore a graph by using the following tools. Any displayed coordinates are shown in rectangular or polar form as set in the graph format. Tool Free-Moving Cursor For Differential Equation Graphs: Works just as it does for function graphs. Differential Equation Graphing 419