Joaquin Peralta

My Personal weblog.

GNU/Linux

Si bien todo el mundo ya conoce gran parte de la avaricia de microsoft, creo que es realmente “irrisorio” que pretendar dominar la web, utilizando como arma su propio lenguaje XAML para sustituir el HTML.

Al menos, aun existen grupos que apoyan a GNU/Linux y que son, a mi parecer los que mejor apuestan a estas alturas del partido.

Como por ejemplo IBM :

El video y el comentario original lo obtuve en : http://rcda.wordpress.com/2007/01/29/microsoft-quiere-que-solo-se-pueda-navegar-desde-su-sistema/

JP.

January 30, 2007 Posted by jperalta | GNU/Linux, Life in general | | 3 Comments

La Peque\~na Gigante.

Santiago, Chile.

Una peque\~na de 7 a\~nos desplazandose por el centro de la capital en busca de un rinoceronte que ha destrozado todo a su paso, no por su maldad, sino mas bien por la confusion que le produjo el caos capitalino.

Gigante

Y claro, no podia ir a solo a precensiar el magno evento, desde el despertar de la ni\~na, la captura del rinoceronte y la puesta en marcha  hacia Plaza Italia sobre su monopatin.

Clau y LoreJose

Junto a la Claudia, la Lorena y Jose. Lo Pasamos Super!!!

JP.

January 28, 2007 Posted by jperalta | Life in general | | 3 Comments

Using Octave for resolv equations systems.

Octave, is a powerful software for numerical analysis. A big part of octave comands are compatible with MatLab (Matrix Laboratory). The basic element for work are the matrixs. Now i want put a sample of resolutions of equations using Octave.

We have a A matrix multiply by a vector x (the incognits), and this is equal to another vector b, i.e. Ax=b

So, first step is run octave with the command octave in a console.

octave:> A = [0, 2,0,1;2,2,3,2;4,-3,0,1;6,1,-6,-5]

and the vector :

octave:> b=[0;-2;-7;-6]

with this information, we can resolv inmediatly using :

octave:> x=A\b
-1.26923
0.38462
0.43590
-0.76923

And this is All!!! … easy :)

JP.

January 27, 2007 Posted by jperalta | GNU/Linux, Physics and Fun | | 1 Comment

Using gnuplot for fit a dataset

Gnuplot, not only a good program for plot datas and function, this program can fit your data easy.

If you have simple set of experimental data, for example a Free Fall, has here.

You can graph this easy, using gnuplot, after of type gnuplot, you can plot your data using

gnuplot> plot "freefall.dat"

So, we need the fit this data to one equationf of the form : h(x)=a*x*x + b*x + c

for a,b,c incognits, so the first step is define the function in gnuplot :

gnuplot> f(x)=a*x**2 + b*x +c

Finally we run the comand for find the values for a, b and c.

gnuplot> fit f(x) "freefall.dat" via a,b,c ;

Afther of the necesary iterarions, you have a results, has here :

Final set of parameters Asymptotic Standard Error
======================= ==========================

a = -4.9 +/- 1.67e-06 (3.409e-05%)
b = 5.01988e-06 +/- 8.632e-06 (171.9%)
c = 100 +/- 9.338e-06 (9.338e-06%)

correlation matrix of the fit parameters:

a b c
a 1.000
b -0.968 1.000
c 0.738 -0.861 1.000

With this, we have our new function : f(x) = -4.9*x*x+ 5E-6 * x + 100;

We can replot our data and the new data set with the command :

gnuplot> replot f(x)

Thanks to Claudia, for this TIP :)

JP.

January 12, 2007 Posted by jperalta | GNU/Linux, Physics and Fun | | 4 Comments

Feed in my blog.

If you want put my blog in your feed plase click here.

JP.

PD: Coming soon in the right menu.

January 9, 2007 Posted by jperalta | Life in general | | 2 Comments

Happy new Year!!!!

Feliz a\~no nuevo!!!!

Felicidades para todo el mundo!!!! que tengan muy felices fiestas y que el a\~no que se aproxima sea mejor que el que se fue, y que para eso, todos coloquen de su parte.

For others languages click here.

JP

January 1, 2007 Posted by jperalta | Life in general | | 1 Comment