Monday, April 27, 2009


A friend of mine told me about this, a web site for trading of finantial instruments. I didn't read all the docs yet. Their client tools runs only on windows - bad start :-(

The "about" section of their home page says:
"Marketiva is a financial services corporation specialized in providing traders with high quality online trading services. With a team of dedicated financial specialists and technical support personnel, Marketiva operates globally as a market maker and principal counterparty to retail traders. ... ."
My friend told me this marketiva gives the investor 5 dollars to start, closes your position automatically if you loose more then 1%.

There are other sites for trading financial instruments, like, but as he says, marketiva is a good to start because it is the one who protects most the investors. The others, as he said, are "spanking cats" ;-)

Friday, April 24, 2009

As-Rigid-As-Possible Shape Manipulation

This morning on the animation class I am taking at grad school, a colleague had shown a paper review on "As-Rigid-As-Possible Shape Manipulation" [1]. I've found that is awesome... There are many applications for this new approach on shape manipulation. There must be someone to write a inkscape extension using this technique.

[1] Takeo Igarashi, Tomer Moscovich, John F. Hughes, "As-Rigid-As-Possible Shape Manipulation", ACM Transactions on Computer Graphics, Vol.24, No.3, ACM SIGGRAPH 2005, Los Angels, USA, 2005. PDF

Thursday, April 23, 2009

GLGlobe - free OpenGl Globe-Earth simulation for linux

I was googling around for some code to use on my next work for the visualization class at grad school, and I found this interesting code.
The web site says it could not compile on my machine, but it did! The code is not too much complex and this could be used in a variety of ways.

Here is what I've got:

Wednesday, April 15, 2009

Converting AVS .net files to DX

I was looking for some documentation on DX (Data Explorer from IBM), now OpenDX, which is a data visualization tool similar to AVS. But I have found this material:

Which, I suspect, is a tool which converts AVS .net files to be used as DX net files. I haven't tested yet, but it looks promising...

GNU R, the best free software tool for statistics

I was playing around with GNU R for distribution fitting last year for my undergraduate conclusion work, and certanly it is the best free software tool for a lot of statistical problems.

GNU R tutorial at Illinois State University

Monday, April 13, 2009

Headlines on big PHP projects on the web

Here are a couple of links listing some big and reliable projects using PHP, like Mediawiki (Wikipedia), Facebok and Wordpress.

Interesting facts on Facebook LAMP infrastructure

Slashdot came with an article which links to an QCon talk describing how Facebook use and optimize its Lamp infrastructure.

Wednesday, April 8, 2009

Converting charset enconding of a bunch o .tex files

A friend of mine came to me asking for a simple way to convert the charset encoding of a bunch o LaTeX files. He had all his files in the UFT-8 encoding and he wanted to convert all of them to "latin-1" (ISO-8859-1).

So, I saved all the files he sent me in the same folder, opened a terminal shell window and typed the following command line:

ls -1 *.tex | while read line ; do iconv -f utf-8 -t iso-8859-1 $line -o "latin1_"$line; done

And voilà, they were now encoded with ISO-8859-1.

Wednesday, April 1, 2009


Note to learn how to use wxWidgets:
On windows (and on wine ;-) we can use wxDev-C++
On Ubuntu, install the libwxgtk2.8-dev deb.