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Programming

What Every Programmer Should Know About Floating-Point Arithmetic 359

Posted by Soulskill
from the gaining-understanding-bit-by-bit dept.
-brazil- writes "Every programmer forum gets a steady stream of novice questions about numbers not 'adding up.' Apart from repetitive explanations, SOP is to link to a paper by David Goldberg which, while very thorough, is not very accessible for novices. To alleviate this, I wrote The Floating-Point Guide, as a floating-point equivalent to Joel Spolsky's excellent introduction to Unicode. In doing so, I learned quite a few things about the intricacies of the IEEE 754 standard, and just how difficult it is to compare floating-point numbers using an epsilon. If you find any errors or omissions, you can suggest corrections."

Comment: I live in the same neighborhood as the Centre (Score 1) 890

by icantblvitsnotbutter (#28145271) Attached to: Church of Scientology On Trial In France

I pass by it every morning when I take my son to daycare. There's always a group in front, having their morning smoke. They all look pretty unexcited to start their day, probably no more or less than a typical office worker. Makes me wonder how much it's a belief for them, and how much it's just a job.

Nothing too special to add, just wanted to comment. And to say that it'd be nice to have them move out, if that ends up happening.

Space

+ - Blue Origin building DC-X lookalike

Submitted by
rrohbeck
rrohbeck writes "The New York Times has a story on what Blue Origin, [Amazon.com founder] Jeff Bezos' space company is up to after his Texas land grab. A couple of Flash videos show a short successful test hop of the "Goddard" test vehicle.

The Goddard has a science-fiction sleekness. Videos show the craft taking off and landing again with a loud whooshing sound. In one view, one of the nine rocket nozzles jitters as it maintains the ship's attitude. Goddard resembles the DC-X, another vertical-takeoff-and-landing craft under development in the 1990s by McDonnell Douglas for the Defense Department and NASA until the government pulled the plug.
And in case you're an aerospace engineer, they're hiring."
Announcements

+ - Solar powered car attempts to break record

Submitted by
Snowdon
Snowdon writes "Jaycar Sunswift III today started on its 4000km across the Australian outback, in an attempt to beat the 8.5 day record from Perth to Sydney. The team expects to complete the journey in 6 days, depending on the weather. It is a seriously innovative machine, with the aerodynamic design iteratively optimised on 80 CS lab computers over three months, custom-built carbon-fibre wheels, chassis, suspension and steering components, and custom-built power electronics and telemetry/control systems (components of which presently use Linux, but will soon run Iguana/Wombat). It is the result of several years' work by both undergraduate and postgraduate students at UNSW. Keep track of the team's progress by visiting www.sunswift.com."
Spam

+ - Dispose of your spam properly!

Submitted by
Anonymous Coward
Anonymous Coward writes "My domain name is periodically being stolen by spammers; they forge outgoing mail using my poor innocent domain name. First, I'd like to plead with mail server administrators out there: please REJECT spam and undeliverable mail. If you reject instead of bouncing then legitimate mail senders will still know there is a problem. Second, do you have any tips for dealing with a flood of spam bounces? Exim is pitching the bounces pretty quickly, but my server is still getting overwhelmed."
Networking

+ - BitTorrent vs. Usenet Rivalry

Submitted by Anonymous Coward
An anonymous reader writes "There's a lot going on in the file-sharing world, and P2P news site Slyck.com has an interesting comparison of two methods of online distribution: Usenet (the newsgroups) and BitTorrent. Slyck concludes that because of its fast speed, large selection and relatively anonymity, Usenet beats out BitTorrent."

Pound for pound, the amoeba is the most vicious animal on earth.

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