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 = a2n2 – 1 , a1 = 0.5

uClassPad Operation

(1)Start up the Sequence Editor.

•If you have another application running, tap mand then H.

•If you have the Sequence application running, tap Oand 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] {2/2-1E

(5)Input the initial value.

0.5E

(6)Tap Oand 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 Efor 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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