Rick Wagner - Lab Zero

Creating a Branch

Since this is my first time accessing the repository, I'm going to create a folder for my code. I could just create the folder, but instead I'll make a copy of the trunk, so that I get whatever's there.

cable:~/Software rpwagner$ svn copy -m "Creating branch for personal work" \ 
> svn://mngrid.ucsd.edu/scicomp/trunk svn://mngrid.ucsd.edu/scicomp/branches/rpwagner

Committed revision 3.
cable:~/Software rpwagner$ 

The -m puts a message in the repository log, a very useful feature.

Checking Out a Branch

Now, I'll check out my branch, so I can get to work. (I can actually do a check from anywhere in the repository structure.)

cable:~/Software rpwagner$ svn co svn://mngrid.ucsd.edu/scicomp/branches/rpwagner
Checked out revision 3.
cable:~/Software rpwagner$ 

Writing a Function

For this, I'm going to make a Python module called fibonacci.py, and write the function in there. Here's the function:

def F(n):
    if n == 0 or n == 1:
        return n
    else:
        return F(n-1) + F(n-2)

Plotting

First, I'll need to start up the interpreter, and import the modules I need:

cable:~/Software/rpwagner rpwagner$ python
Python 2.4.3 (#1, Apr  7 2006, 10:54:33) 
[GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import scipy
>>> import pylab as p
>>> import fibonacci

Next, I'll generate the first 20 Fibonacci numbers:

>>> x = scipy.arange(0,19)
>>> fibs = []
>>> for val in x:
...     fibs.append(fibonacci.F(val))
... 
>>> fibs = scipy.array(fibs)

And finally, the plot:

>>> p.semilogy(x,fibs)
[<matplotlib.lines.Line2D instance at 0x354b7b0>]
>>> p.show()

Submitting to the Repository

And now, I get my work into the repository. Since I've made a new file, this is a two step process:

Tell Subversion you want to add the file

cable:~/Software/rpwagner rpwagner$ svn add fibonacci.py
A         fibonacci.py

And then commit any changes

cable:~/Software/rpwagner rpwagner$ svn commit -m "Fibonacci calculator for Lab Zero" 
Adding         fibonacci.py
Transmitting file data .
Committed revision 4.
cable:~/Software/rpwagner rpwagner$ 

Fin!