Texas Instruments TI-82 User Manual - Page 104
Exploring a Sequence Graph
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Exploring a Sequence Graph As in Function graphing, three tools are available for exploring a graph: using the free-moving cursor, tracing a function, and zooming. Free-Moving Cursor The free-moving cursor works in Seq graphing just as it does in Func graphing. In RectGC FORMAT, moving the cursor updates and displays (if FORMAT is CoordOn) the values of X and Y. (In PolarGC Web FORMAT, X, Y, R, and q are updated, and R and q are displayed.) TRACE In Time FORMAT, when you begin a trace, the cursor is on the first selected function at nMin. TRACE displays (if FORMAT is CoordOn) the values of Un or Vn and n. ~ moves the cursor forward along the function one n at a time. It updates Un, n, X, and Y. In Web FORMAT, the trail left by the TRACE cursor helps identify points with attracting and repelling behavior in the sequence. When you begin a trace, the cursor is on the X axis at the value of Unstart or Vnstart (the first selected function). TRACE displays and updates (if FORMAT is CoordOn) the values of n, X, and Y (or R and q). X and Y (or R and q) are calculated from n. ~ moves the cursor between the function and the graph of Y=X, displaying both for n before incrementing n. If the cursor moves off the top or bottom of the screen, the coordinate values at the bottom of the screen continue to change appropriately. In Seq, | or y | moves the TRACE cursor to n=nMin. QuickZoom and panning are available in Seq graphing. ZOOM ZOOM operations works in Seq graphing as they do in Func graphing. Only the X (Xmin, Xmax, and Xscl) and Y (Ymin, Ymax, and Yscl) WINDOW variables are affected. Unstart, Vnstart, nStart, nMin, and nMax are not affected, except when you select ZStandard (UnStart=0, VnStart=0, nStart=0, nMin=0 and nMax=10). The ZOOM MEMORY variables in Seq graphing include ZUnStart, ZVnStart, ZnStart, ZnMin, and ZnMax. CALC value is the only CALC operation available in Seq graphing. It is not available in Web FORMAT. 6-6 Sequence Graphing