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After you execute the program above, you can recall and display the
picture with the instruction RecallPic 6.
Graphing Cobweb Attractors
Problem
Using Web format, you can identify points with attracting and repelling
behavior in sequence graphing.
Procedure
1. Press z. Select Seq and the default mode settings. Press y
.. Select Web format and the default format settings.
2. Press o. Clear all functions and turn off all stat plots. Enter the
sequence that corresponds to the expression Y = K X(1NX).
u(n)=Ku(nN1)(1Nu(nN1))
u(
nMin)=.01
3. Press y 5 to return to the home screen, and then store 2.9 to K.
4. Press p. Set the window variables.
5. Press r to display the graph, and then press ~ to trace the
cobweb. This is a cobweb with one attractor.
:Pt-On(X,Y)
:End
:StorePic 6
Draw point.
End of For group.
Store picture.
nMin=0
nMax=10
PlotStart=1
PlotStep=1
Xmin=0
Xmax=1
Xscl=1
Ymin=
M.26
Ymax=1.1
Yscl=1