Monday October 15

1. Finish the butterfly model so that it exports the plot data to a file,
as described in Section 5.4.

2. Follow the suggestions in Section 5.5 to make a new version of the model
that reads in a data file to create a real landscape.

3. If your computer is like mine, the setup step will take a long time to
generate the landscape. Think of a way to avoid this. Of course, the first
time you run setup, it will have to generate the landscape, and this will be
slow. But is there a way to restart the simulation, using the same landscape
without having to read in the data file? If you have time, try to add this
capability to your model.