Texas Instruments TI-84 - Manual (Page 169)

Chapter 6: Sequence Graphing 166
Valid Functions for Web Plots Valid Functions for Web Plots Valid Functions for Web Plots Valid Functions for Web Plots
When Web axes format is selected, a sequence will not graph properly or will generate
an error.
• It must be recursive with only one recursion level ( u(n
N
1) but not u(n
N
2) ).
• It cannot reference n directly.
• It cannot reference any defined sequence except itself.
Displaying the Graph Screen Displaying the Graph Screen Displaying the Graph Screen Displaying the Graph Screen
In Web format, press
s to display the graph screen. The TI-84 Plus:
• Draws a y=x reference line in AxesOn format.
• Plots the selected sequences with u(n N 1) as the independent variable.
Note: A potential convergence point occurs whenever a sequence intersects the y=x
reference line. However, the sequence may or may not actually converge at that point,
depending on the sequence’s initial value.
Drawing the Web Drawing the Web Drawing the Web Drawing the Web
To activate the trace cursor, press
r. The screen displays the sequence and the
current n , X, and Y values (X represents u(n N 1) and Y represents u(n) ). Press
~
repeatedly to draw the web step by step, starting at nMin . In Web format, the trace cursor
follows this course.
1. It starts on the x-axis at the initial value u(nMin) (when PlotStart=1 ).