Texas Instruments TINSPIRE Teacher Software Guidebook - Page 406

After you type a different step increment, the Graph Trace tool moves across the graph in steps of that size, instead of moving at the default step automatically defined with a function. 3. Use Graph Trace to explore a graphed function in the following ways: • Move to a point and hover to move the trace cursor to that point. • Press 7 or 8 to move from point to point on the function's graph. The coordinates of each point traced displays. • Press 9 or : to move from one function's graph to another, or to a scatter plot. The point's coordinates update to reflect the new location of the trace. The trace cursor is positioned on the point of the new graph or plot with the closest x value to the last point identified on the previously traced function or graph. You can trace multiple functions as described in Tracing all graphs. • Type a number and press · to move the trace cursor to that value on the function's graph. • Create a persistent point that remains on the graph while in Graph Trace mode by pressing · when the trace point reaches the point you want to label. • Trace through and identify the points at which the function has no defined x or y value (a discontinuity). The string undef displays instead of a value when you move over a point that is not defined for the function. Notes: • When you select or trace a function on the work area, that function displays on the Edit Line. • When you trace beyond the initially visible graph, the screen pans to show the area being traced. 4. Exit Graph Trace by pressing d or by choosing another tool. Finding points of interest You can use the tools on the Analyze Graph menu to find a point of interest in a specified range of any graphed function. Choose a tool to find zero, the minimum or maximum, the point of intersection or inflection, or the numeric derivative (dy/dx) or Integral on the graph. 1. Select the point of interest that you want to find on the Analyze Graph menu. For example, to find a zero, press b 6 1. 394 Using the Scratchpad