## Saturday, 19 December 2009

### New repository

New mercurial repository on google code for my toy projects:

## Friday, 29 May 2009

### Lisp/Scheme interpreter with Python

I wrote a simple Scheme/Lisp like interpreter some time ago. It was just a dumb idea after hours of of Scheme programming at university ;)
It currently supports define, quote, cdr, car, some arithmetical operations and even lambda functions.
If you want to extend the interpreter, you have to bind a new function to the global environment.

For car it looks like that:
def car_builtin(l, env, interp):     assert len(l) == 1     v = l.head().visit(interp, env)     return v.head()env = Environment()env.bind("car", Function(car_builtin))

There is a simple example script in the SVN repository to calculate the faculty of a given number.
(define fac (lambda (f)  (if (< f 2) 1 (* (fac (- f 1)) f)) ))

Call fac with
(fac 11)

and you you'll get the correct result: 39916800. hehe.

The complete python script can be downloaded from Google Code (http://code.google.com/p/dev-null). It only consists of a few lines of code for scanner, parser, AST, "runtime library" and interpreter.

## Thursday, 28 May 2009

### LaTeX & Blogger

After some time tinkering with blogger, I found a simple solution to get LaTeX working (http://www.botcyb.org/2008/10/rendering-latex-in-blogger.html).

Looks nice ;)
\int_{0}^{1}\frac{x^{4}\left(1-x\right)^{4}}{1+x^{2}}dx=\frac{22}{7}-\pi

Edit: Latex rendering is not available anymore :(

### Programming & CG Blog

This blog is about programming and computer graphics (especially raytracing and gi algorithms).
From time to time, I'll post some articles in this blog.