Typo and hints on f2py in Ex2

Dear class-

There is a typo in the global minimum energy for N=9. It should read 24.1134, not 21.1134.

Also, if you are having trouble getting f2py working on Windows, here are some potential troubleshooting steps:

(1) Close out and re-open your command prompt after any change to the system (e.g., environment variables).

(2) Re-download libpython25.a from the course website and install it in c:\python25\libs (plural).

(3) When running f2py at the command line, try "python c:\python25\scripts\f2py.py" instead of just "f2py".

(4) If all else fails, reinstall Python. First, uninstall VPython, SciPy, NumPy, and Python from Add/Remove Programs. Then, delete the folder c:\python25 entirely. Next reinstall these utilities in this order: Python, NumPy, SciPy, and VPython. You may want to hold off installing VPython until you've tried to get f2py to work.

I apologize for any headaches here, but once you have everything installed, it will be smooth-sailing from now on. Moreover, rest assured the Python/SciPy/NumPy development communities are working to automate /streamline installs so that you shouldn't have to worry about these issues down the road.

-MSS