Physics Services

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I'm sorry, but I won't provide anymore support on the packages I was once happy to share. After years I became very skeptic about the true openness of Scilab, and decided to drop my involvment in it. This page is historical.

Scilab stuff:

Scilab is a nice and free graphics/numerics/system simulation package. The main reasons for me to use it for my work and to prefer it to a commercial equivalent, like what could have been e.g. Matlab, PV-Wave, AVS, etc., were that a) it is free, b) it is quite sophisticated, c) it is multiplatform, d) it leans Toward open sourcish.
Being under developement, though, not everything is perfect. I'm oriented toward graphical postprocessing, and I felt some lack of nice looking, publication quality plotting primitives. Then I started to write my few own ones. What came out is a toolbox of mainly 2D and 3D graphics macros, which I contributed to the development tree and submitted to the scilab user group . Maybe they're not that much, but I was definitely missing them at some point or another. The current stable version of this toolbox is 0.10 (6/10/2005). The contribution used to be known as ENRICO from the very beginning. It's a stupid name, but I was too lazy for thinking to a better one. Here you can get:

The main graphics/rendering/data manipulation toolbox:

the .tgz file (128Kb). [older versions and the bleeding edge (23/7/2007) can be retrieved here ]
the README of the package, which contains a short description of all the routines, and installation instructions (these, courtesy of the Scilab team).
the changelog of the package.

You might also want to check out:

my specialized contribution for Particle Image Velocimetry with Scilab (v 0.3.2, 26/9/2005). Cross correlation method, subpixel interpolation, multipass refinement, anti-aliasing window shifting. Old versions archived here . You can also see the README and the changelog.
my (old) work in progress on integration between Scilab and FEATFLOW . Featflow is an academic, multi pourpose, public domain finite element solver for fluid dynamics. The toolbox cares for visualization and postprocessing of the flow fields.
a small set of helper functions, supposed to help in building tk user interfaces a la scilab (ancillary to the set figure(), uicontrol(), get(), set(), close(), that is): they help to stack objects together, to align labels to buttons, to draw frames around groups of objects without becoming crazy with ...,"position",[x,x,x,x]...
a toolbox for accessing the serial ports in Scilab [12/1/2009: corrected bug 3829]. Differently than other ones, this is a portable, all-Scilab toolbox (in fact, via tcl). Tested so far under linux, win98 and winxp, various versions of scilab 4+, but reported to work with Scilab 5 as well.
the slides of a talk I've given at the SCILAB2004 conference on Scilab for Fluid dynamics (pdf, 1.3MB).

Copyleft for all this is that, if you download it, it would be very nice if you drop me an email to tell me if you think the work was worth.

Examples of the main graphical toolbox:

(click here for more)

This is something which can be done with some of these macros. It is an isosurface of some computer-generated 3d data (let's skip for the moment what sort of), plotted with lighting shading.

Click on the picture to retrieve a foggy 278Kb MPEG animation

Here is the script which produced the movie:

stacksize(12e6)
exec ../sciscript/F2.sc; // retrieves my data in a hypermatrix w
timer();
[xx,yy,zz]=isosurf3d(w(:,:,30:$),20); // <-- a routine of mine
timer()
b=(-180:8:180)+5;
setcmap(-10) // <-- another routine of mine
driver('GIF');
for k=1:length(b);
a=%pi*b(k)/180+1;
xinit ('A'+string(1000+k)+'.gif'); xset('wdim', 300, 300); xbasc()
shadesurf(xx,-yy,10*zz,-sin(a),cos(a),b(k),80); // <-- another routine of mine
xend()
end
disp 'calling ImageMagick to create the animated file...'
unix('convert -delay 100 -loop 50 A*.gif rosario.mpg; rm A*.gif');

This is a sampler of colormaps (routine setcmap() ):

More examples (rendered 3d objects)

Comments and suggestions to enrico.segre AT weizmann.ac.il

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