Texas Instruments PLUS TI-89 - Manual (Page 161)

144 Chapter 9: Sequence Graphing
09SEQUEN.DOC TI-89/TI-92 Plus: Sequence Graphing (English) Susan Gullord Revised: 02/23/01 10:59 AM Printed: 02/23/01 2:14 PM Page 144 of 14
Standard values (set when you select 6:ZoomStd from the „ Zoom
toolbar menu) are:
nmin = 1. xmin = ë 10. ymin = ë 10.
nmax = 10. xmax = 10. ymax = 10.
plotStrt = 1. xscl = 1. yscl = 1.
plotStep = 1.
You may need to change the standard values for the n and plot
variables to ensure that sufficient points are plotted.
To see how plotstrt affects a graph, look at the following examples of
a recursive sequence.
This graph is plotted beginning
with the 1st term.
This graph is plotted beginning
with the 9th term.
With TIME axes (from Axes on the Y= Editor), you can set plotstrt = 1
and still graph only a selected part of the sequence. Simply define a
viewing window that shows only the area of the coordinate plane
you want to view.
You could set:
¦ xmin = first n value to graph
¦ xmax = nmax (although you
can use other values)
¦ ymin and ymax = expected
values for the sequence
The Graph Order format is not available.
¦ With TIME or CUSTOM axes, multiple sequences are always
plotted simultaneously.
¦ With WEB axes, multiple sequences are always plotted
sequentially.
Window Variables
(Continued)
Note: Both of these graphs
use the same Window
variables, except for plotstrt.
Changing the Graph
Format
plotStrt=1
plotStrt=9
plotStrt=1 nmax