Texas Instruments TI89TITANIUM User Manual - Page 420
tstep, tplot, ZoomStd, Trace, ncurves, Value, For Differential Equation Graphs
UPC - 033317191833
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Tool „ Zoom ... Trace ‡ Math For Differential Equation Graphs: Works just as it does for function graphs. • Only x (xmin, xmax, xscl) and y (ymin, ymax, yscl) Window variables are affected. • The t Window variables (t0, tmax, tstep, tplot) are not affected unless you select 6:ZoomStd (which sets all Window variables to their standard values). Lets you move the cursor along the curve one tstep at a time. To move approximately ten plotted points at a time, press 2 B or 2 A. If you enter initial conditions in the Y= Editor or let the ncurves Window variable plot curves automatically, you can trace the curves. If you use: @ 2Š IC from the Graph screen to select initial conditions interactively, you cannot trace the curves. QuickCenter applies to all directions. If you move the cursor off the screen (top or bottom, left or right), press ¸ to center the viewing window on the cursor location. Use C or D to view results on all plotted curves. Only 1:Value is available. • With TIME axes, the y(t) solution value (represented by yc) is displayed for a specified t value. • With CUSTOM axes, the values that correspond to x and y depend on the axes you choose. Note: During a trace, you can move the cursor to a particular point by typing a value for t and pressing ¸. You can use QuickCenter at any time during a trace, even if the cursor is still on the screen. Differential Equation Graphing 420