Advogato: Personal info for vicious

vicious is currently certified at Master level.

Name: Jiri (George) Lebl
Member since: N/A
Last Login: 2008-01-26 02:23:29

Notes: Math geek, formerly software geek. This exhibits itself by putting latex code into C programs by mistake, rather than vice versa as used to happen previously.

Credentials: Mathematics: I have successfully used the Baire Category Theorem in actual research. See my UIUC page for more.
Coder: I have created more easter eggs in gnome software than anyone else at the time. For example, Wanda the fish, which appears in more than one place if you know where to look and what to press, gdm computing square root of 2 or pi by monte carlo method, asking for coins on login, killer gegls from outer space, and more... At various times I was actually paid for this by Eazel and RedHat.

Below it says I'm a developer in a buttload of projects, but I'm not really anymore on anything by genius, since I don't have much hacking time these days.

Projects

Lead Developer on GOB
Lead Developer on Dr Genius
Developer on GNOME Libs
Lead Developer on GnoP
Contributor on GConf
Contributor on Nautilus
Contributor on GNOME VFS
Contributor on GNOME i18n Project
Developer on gnome-utils
Contributor on GDM
Contributor on GNOME Panel
Lead Developer on Grapevine
Lead Developer on genius

Articles Posted by vicious

Miscategorization and Science 28 Oct 2007 at 14:38 UTC
Killing vs. Copying 24 May 2002 at 16:45 UTC
Initial Announcement of OFSET 16 Jun 2000 at 04:30 UTC

Recent blog entries by vicious

Syndication: RSS 2.0

23 Jan 2008 »

My palm is blinking red and I hear I should go to some carousel.

13 Nov 2007 »

I thought people would be able to drive better in the rain in Urbana. But it is just as bad as it was in California, where it was excusable for general lack of rain. I was actually passing cars on my bike because they were going too slowly. I guess people think that driving slow, erratically and breaking at very unexpected moments is much safer in rain. So 90% of drivers are driving in a horrible way and the other 10% have road rage and weave through traffic angrily because they are pissed of at the other 90%. I actually saw a traffic jam yesterday because locals seem to be unable to move through an all way stop sign, a problem made worse by the rain.

I guess I am more pissed off about the inability of people to move on the road when it is raining and I am on a bike and thus trying to get home quickly. When bike is faster than cars and you are not in a big city where that would be expected, than something is wrong.

8 Nov 2007 (updated 8 Nov 2007 at 03:44 UTC) »

Had a talk at UW-Madison yesterday. I think it went pretty well. Walter Rudin came and seemed interested as well, I think that has to count for quite a bit in the ego boost category.

18 Oct 2007 »

Looking at the freedesktop.org vfolder menu spec, I am getting the feeling that the original intention got totally derailed. The reason I looked at it since I needed to fix up the genius .desktop file. Anyway, the original intention was not to enforce any particular menu structure, and to allow arbitrary queries based on exhaustive set of keywords (categories). The way most menus nowdays work is that if you define two main categories which do overlap for your application, you might appear in two badly designed menus. Some arbitrarily badly picked "main categories" subset of all categories was chosen, and most menus just treat those as basically menu titles. The OnlyUnallocated query is totally screwed up now according to spec, since it doesn't make a distinction from excluded and deleted. That means that if your queries are only slightly tougher than normal, some .desktops might not appear even if OnlyUnallocated was used for some submenu.

The intention of the original implementation was that all installed apps appear unless the user intentionally turns off the icons in some menu editor. Why would I ever install something unless I wanted to run it. Any other behavior is a critical bug in my opinion.

Picking "main categories" was exactly what the menu spec was supposed to avoid. That is, you should pick the CORRECT categories, not miscategorize your application just in order for it to appear in some currently badly designed menu. The set of category keywords was supposed to be independent of the menu structure!

Example of total miscategorization: Science/Mathematics apps. There's quite a bit of them, but they will never appear in a proper category, so they are all miscategorized just so that they appear. Properly, something like Octave or Maxima should include Application;Science;Math; and should appear in "Other" or in "Science" or "Science & Math" submenu. As it is, Maxima for example, appears in "Education" in fedora.

In any case the situation is no better (and it may in fact be worse) than it was before the vfolder menu spec. Stupid arbitrary submenus are pretty much enforced and you MUST categorize your application within these in order for your app to appear. So even if a good implementation came along, it wouldn't correctly categorize your menus since the .desktop files have bogus (or not enough) information in them. At least in the way things were done before all apps were at least displayed.

Anyway, I just felt like ranting.

16 Oct 2007 »

For about the past week, I am finally a proper Illinoisan, having at last gotten my local drivers license. It is quite a different experience from California, where they send you everything by mail usually much later than they promise. Here we got our licenses and the plates and all on the spot. I have to admit the test and application had some logically nonsensical questions. For example there is a question that says something to the effect of "Do you drink alcohol such that it inhibits your driving ability?" Now you have to answer no to this else they won't give you the license. Some idiot didn't think the question through logically. Of course I drink to the point where it would inhibit my driving ability. The question is: do I drive after that? But what they asked didn't have this component, thus anybody but an abstinent must lie to get an Illinois drivers license. Or if you are sure that drinking does not affect your driving ability, then you can answer no to the question, and still get hammered and drive drunk without having lied on your application. Hmmm...

After several weeks of not being able to produce anything useful, I've made a whole bunch of updates to genius and made a 1.0.0 release. It's not that it's so much more featureful than 0.7.7, but hell, it's been 10 years now, there ought to be a 1.0.0 release one of these days. I know I made a pledge to not release until it can do eigenvalues/eigenvectors in general, but I'm not sure when I will implement that. There is RQI code in there now, so you can get an eigenvalue and an eqigenvector for a general matrix, but I suppose the correct solution is to hook it up to some lapack code or some such. libgsl has some matrix stuff for double precision which I suppose would be fine, but it doesn't yet do arbitrary complex matrices either and I was too lazy to hook it up. Plus I'd need to depend on fairly new libgsl ...

I've made them install genius and maxima on all the linux boxes in the UIUC math department even though most people here use Mathematica since Wolfram is here in town. Strange as it seems, there are actual genius users out there, so perhaps it is time to make their ranks larger (no pun intended).

I'm also still working on a paper on which I was working when I last wrote a blog entry. I've yet again made the theorems slightly stronger in hopes of improving exposition (doesn't that sound weird). So it's still not arxiv ready I don't think for another week or so. So far people that have seen it like it.

151 older entries...

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