Operation Manual

Chapter 6: Sequence Graphing 106
Chapter 6:
Sequence Graphing
Getting Started: Forest and Trees
Note: Getting Started is a fast-paced introduction. Read the chapter for details.
A small forest of 4,000 trees is under a new forestry plan. Each year 20 percent of the trees will be
harvested and 1,000 new trees will be planted. Will the forest eventually disappear? Will the forest size
stabilize? If so, in how many years and with how many trees?
1. Press z. Press † † † ~ ~ ~ Í to select
Seq
graphing mode.
2. Press y . and select
Time axes format and
ExprOn format if necessary.
3. Press o.
If the graph-style icon is not ç (Dot-Thick), follow
these steps to change it to Dot-Thick.
• Press || Í. Press † to go to the Line
Spinner menu. Press | or ~ until ç (Dot-Thick) is
displayed. Press † Í, and then press ~~.
Note: You can also use Dot-Thin to see a sequence
point as one pixel (1 x1).
4. Press  ~
3 to select iPart( (integer part) because
only whole trees are harvested. After each annual
harvest, 80 percent (.80) of the trees remain.
Press Ë
8 y [u] £ „ ¹ 1 ¤ to define the
number of trees after each harvest. Press Ã
1000 ¤
to define the new trees. Press †
4000 to define the
number of trees at the beginning of the program.
Note: You can also press t
a 1 to select [u].