Sparse matrices, so close I can almost taste it

So the sparse matrix implementation has begun (and almost ended). In the spirit of python I decided to try using python's built-in dictionaries for my sparse matrix implementation.

With limited experience in deep OOP, I've had to quickly learn the subtleties of OOP. The nature of scope really comes into play in a way that can be quite annoying.

*edit* 2 hours later, I have tasted it and it tastes good.

Circular imports

So in moving a function to solvers.py, I recently came across an interesting phenomenon in python. It's very well-illustrated here:
http://www.thescripts.com/forum/thread22561.html

It boils down to the fact that you can't do circular imports except in a specific manner. Now, I'm not one for hacking around this specific type of behaviour - I think you can just restructure the code so as not to do this - but what is the reasoning for why this works with "import *" but not with "from * import *". Interesting....

- C

Getting into the groove

Looks like I'm finally getting the hang of this project. The functionality is coming along nicely. Most of my first week was spent putting together some new manipulation functions including matrix slicing (i.e. a submatrix operator like M[0:2,:]). You can also assign values too which is handly.

This week has been focused on LU decomposition and making a solver for that (which will also yield a nice matrix inverter). I think I've finally got the pivoting working properly so I'm glad for that.

As someone who didn't do a terrible amount of coding as a undergrad I have to say that I finally see the appeal of the whole process.

Hope things are going well for the other SOC'ers,
Chris

Behind the ball!

Hello all!

Unfortunately, I've had to relocate to another city and the past few weeks have been spent finding a new home. But it seems the end is in sight - a new apartment has been found and I look forward to getting to work. Moving day is Wednesday and it's close to the local library where I'll be able to make a running start on my work.

It seems that I'm one of the last people to start on my project. Great initiative by my fellow SOCers. It has only strengthened my resolve to do a great project. My plan is to review the code again and to contact Mateusz who, I've been told, has been doing some of the LA work. Thanks Mateusz!

I hope to ramp up on my contact with the sympy group over the next week.

Thanks guys!

First post!

I'll be participating in Google's Summer of Code project for 2007. I'll be working on the linear algebra package for sympy - a symbolic math project in python.

For those other students writing python code, you might be interested to know that Wingware will give you a free copy of their editor WingIDE as a participant. That is, if you're not a vi or emacs nut...