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Media Loves Apple and Its Army of Fans

sir99 Re:MS is hurting (356 comments)

I still haven't found a player for my Mac (or Linux laptop) that can run songs/movies at double speed without making everyone sound like chipmunks.

MPlayer can supposedly do it, though I haven't tried.

mplayer -speed 2 -af scaletempo foo.avi

more than 4 years ago

US Tests System To Evade Foreign Web Censorship

sir99 Re:Dear US Government (219 comments)

It's the great firewall of America, duh.

more than 5 years ago

Parents Baffled By Science Questions

sir99 More science questions (656 comments)

How is babby formed? how girl get pragnent?

more than 5 years ago

SMS Hack Could Make iPhones Vulnerable

sir99 Re:In other news... (254 comments)

-1, Troll, I assume?

more than 5 years ago

Rude Drivers Reduce Traffic Jams

sir99 Re:and yet NYC still has traffic jams (882 comments)

Your father probably could have beat that ticket. PA Title 75, 3368(c)(4) says,

No person may be convicted upon evidence obtained through the use of devices authorized by paragraphs (2) and (3) unless the speed recorded is six or more miles per hour in excess of the legal speed limit. Furthermore, no person may be convicted upon evidence obtained through the use of devices authorized by paragraph (3) in an area where the legal speed limit is less than 55 miles per hour if the speed recorded is less than ten miles per hour in excess of the legal speed limit. This paragraph shall not apply to evidence obtained through the use of devices authorized by paragraph (2) or (3) within a school zone or an active work zone.

Paragraph (2) refers to radar, and paragraph (3) refers to timing a car between two points. Strangely, this doesn't seem to cover a cop pacing you and looking at his speedometer. Also, I think that if you admit to speeding, you can still be convicted regardless of the above.

more than 5 years ago

CFLs Causing Utility Woes

sir99 Re:Harshness is all about color temperature (859 comments)

According to Wikipedia, heat pumps are often 300-400% efficient, compared to 100% for resistive heating. This means that a heat pump could add 3-4 Joules of heat to your house while only taking 1 Joule of electric energy from the grid (most of the heat comes from the outside air, the rest from resistive heating, etc.).

OTOH, a resistive heater adds 1 Joule of heat by consuming 1 Joule from the grid (minus a smidge lost in your outside wiring).

more than 5 years ago

Raytheon Exoskeleton Brings "Iron Man" to Life

sir99 Re:In Soviet Russia... (199 comments)

No, that would be an endoskeleton.

more than 6 years ago


sir99 hasn't submitted any stories.



Affine Arithmetic Library

sir99 sir99 writes  |  more than 11 years ago Anyone interested in helping to write an Affine Arithmetic library? It's quite challenging, and requires a good understanding of floating-point math and calculus.

Right now I'm trying to make what I have so far suitable for distribution. I have the basic library and several (mathematical) functions implemented, but I need to go through and implement rounding-error control in all of the functions. My interval arithmetic library is a little more complete. My main focus right now is to make it a little more portable and distributable with autoconf and automake, but I don't have any experience with those.

I do have a neat implicit function grapher that uses the library, but it's rather hackish at the moment, and requires you to use postfix notation. I also have a bit of a testsuite written.

I would love to hear from anybody who's interested in the library. Unfortunately I haven't gotten around to posting the library publically yet, but I'll try to post some pictures generated by the function grapher on my web site some time.

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