6-5-1

Drawing a Cobweb Diagram

6-5 Drawing a Cobweb Diagram

You can use the procedure described here to input a sequence and draw a cobweb diagram.

Example: To graph an+1 = an2 – 1 , a1 = 0.5 2

SClassPad Operation

(1)Start up the Sequence Editor.

• If you have another application running, tap /and then .

• If you have the Sequence application running, tap

and then [Sequence Editor].

(2)Tap the [Recursive] tab.

(3)Specify the recursion type by tapping [Type] and then [an+1Type a1].

(4)Input the recursion expression.

Tap the input box to the right of an+1:, and then use the procedures under “6-2 Inputting an Expression in the Sequence Application” to input the following.

[n,an] [an] : 

(5)Input the initial value.



(6) Tap

and then [View Window].

• This displays a dialog box for configuring View Window settings.

(7)Configure View Window settings as shown below.
xmin = –2

xmax = 3

xscale = 1

xdot: (Specify auto setting.)

ymin = –1

ymax = 1

yscale = 1

ydot: (Specify auto setting.)

(8)After everything is the way you want, tap [OK].

(9)Tap .(10)Press for each step of the web.

Tip

On the cobweb graph window, you can draw the cobweb diagram again by selecting Trace on the Analysis menu.

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