An ag(e)ing hacker - posts tagged as "gnu"

Luca Saiu's blog

Posts tagged as "gnu" (10 posts)
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Happy pi Approximation Day 20142014-07-22 00:10
Updated: 2015-01-23 22:59
It’s 22/7 again. Last year on pi Approximation Day I published a simple Forth program based on an intuitive geometrical idea: see Happy pi approximation day 2013 (<>). I’ve been thinking about what to do in 2014 for some time, without finding anything as nice from the programming point of view. Sure, you can find series and continued fractions converging to pi, even rapidly; these methods work, but the corresponding programs are trivial to code and don’t provide any insight. So I chose another route: a practical experiment to approximate pi by cutting and weighing metal. The result turned out [...] Read more
Tags: english, experiment, gnu, guile, hacking, pi, science

A practical GNU epsilon tutorial2013-08-23 12:54
Updated: 2013-12-27 19:39
A practical GNU epsilon tutorial Audience Lexical conventions Rationale and introduction My PhD thesis Implementation, and the relation beteen epsilon0 and epsilon1 The bootstrap problem Setup Writing more comfortably, from ‘guile+whatever’ and Emacs Basics of epsilon1 The stuff values are made of: fixnums, pointers, buffers Error situations in epsilon1 Slightly higher-level data structures: vectors, strings, boxes, tuples, records Equality and boxedness tags Lists, and simple programming examples Digression: a look at epsilon0 Practical programming in epsilon1 Sums A programming example: structural equality with boxedness tags A look at reflective data structures ‘e1:define’ is just a macro! S-expressions What’s the point [...] Read more
Tags: english, epsilon, gnu, guile, hacking, tutorial

Hello from the GHM2013-08-22 16:13
Updated: 2013-08-31 21:15
Posting during a quiet time at the GHM pre-meeting, before most people arrive. We have something new to show: [ghm-t-shirt] I went to get the t-shirt at the shop this morning, with José; they did a nice job in the end. This post is just for bragging a little, and to make the people who aren’t here envious. — Luca Saiu, 2013-08-22 16:13 (last update: 2013-08-31 21:15) [...] Read more
Tags: english, gnu, hacking

Playing with graphics2013-08-12 02:40
Updated: 2015-01-26 19:43
I’m not good at graphics. Or rather, don’t think I have particularly good taste. Now that I’m thinking of it, in the remote past as part of my first big job I was actually paid to do photo touch-ups. It was my driving school job. Old graphic hacks The screenshot below belongs to that project; what we would call now an e-learning system, to be used locally on the driving school computers. [a simple touch up I did] The driving school owner went around taking photos of the roads in the neighborhood, so that his customers could recognize familiar places, [...] Read more
Tags: english, gimp, gnu, graphics, hacking

Privacy 2013: Why. When. How --- a talk by Werner Koch2013-08-05 23:05
Updated: 2013-08-26 12:16
A couple days ago Sylvain (<>) asked me to proofread his transcription of the latest talk by Werner Koch (<>). That was an occasion for listening carefully to what Werner has to say about electronic communication privacy in the global police state. Following his speech while paying attention to the text was instructive for me and, I think, a good use of my time. Werner is very competent on the subject: he’s a security expert and, as you probably know, the main author of GPG (<>). [Werner Koch speaking] Werner speaking: a frame from the video, CC-BY-SA <>. I’ve known [...] Read more
Tags: english, gnu, politics, privacy, security, talk

Happy pi approximation day 20132013-07-21 12:34
Updated: 2014-07-21 21:14
The fraction 22/7 has been known since antiquity as a simple rational approximation of pi. The fraction decimal expansion is 3.(142857); since pi is about 3.141592653589793, the approximation has three correct digits. Of course nowadays we can compute much better approximations with computers, and billions of digits are known: <π> is a nice review also explaining some efficient computation methods. For example if you want to obtain a lot of pi digits in a short time you may like the series by Ramanujan, yielding very good approximations even with a small number of terms; but that’s not the point now. [...] Read more
Tags: forth, gnu, hacking, pi, tutorial

GNU Hackers Meeting 2013 in Paris, France2013-05-17 20:39
Updated: 2013-10-10 21:36
Thanks to a kind offer by Sylvestre Ledru (<>) from IRILL (<>) we have a venue for this year’s GNU Hackers Meeting: we will be in Paris, France, for the second time at IRILL after the very successful 2011 edition. Since I live near Paris and I also happen to work at IRILL once or twice a week I’ve decided to do something to help organize the event, along with Sylvestre and Dodji Seketeli (<>) who graciously volunteered as well. The meeting will take place in late August 2013: right now we’re deciding whether to have talks on Friday 23 [...] Read more
Tags: english, ghm, gnu, hacking, paris

European unitary patent amendments2012-12-10 13:17
Updated: 2012-12-11 19:40
Please call the Members of the European Parliament right now, asking them to support amendments 74 and 76 on the Unitary Patent directive. <> • Amendment 74 restates that software is not patentable, as already expressed by the European Parliament in 2003 and 2005; • amendment 76 makes explicit the legislator’s control, in particular the European Parliament’s. Without this amendment the European Patent Office would not be accountable to enforce any limit on patentability, thus opening the door to unlimited US-style patenting of abstract ideas including pure software. All amendments, including 74 and 76: <> The plenary vote will take [...] Read more
Tags: english, europe, gnu, politics, software-patents

Meta-update and GNU epsilon news2012-08-29 23:33
Updated: 2012-09-16 13:38
This little diary of mine needed some love. A good excuse to motivate myself to write more often comes from the idea of syndication in the GNU Planet (<>); to make that possible without adding off-topic stuff to the GNU site I’ve recently improved trivalblog to also support per-tag RSS and Atom feeds — the idea being, of course, to have only posts explicitly tagged as “gnu” linked from the planet. My little blog system is described in The trivialblog software (<>). It’s just a quick unpolished hack with no documentation built upon bash and Texinfo, but I find it [...] Read more
Tags: english, epsilon, gnu, hacking, meta

The trivialblog software2011-09-08 08:45
Updated: 2011-09-08 14:44
I’ve written the software running this blog myself, in Bash; in fact it’s mostly a simple combination of GNU command-line utilities, producing completely static HTML. Texinfo renders the post source text into HTML; my scripts generate indices, links and other minor things. I will probably add a PDF export feature later. I’ve put together the software very quickly, for myself; the source is crude and there’s no documentation, but since I guess somebody might want a copy anyway I’m publicly releasing it. trivialblog is free software, released under the GNU GPL version 3 or later. Most icons were not drawn [...] Read more
Tags: english, gnu, hacking, meta, software-by-myself

Posts tagged as "gnu" (10 posts)

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Luca Saiu

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