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Revision as of 10:14, 5 November 2008

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Gauss–Newton algorithm

I found R very useful. I would appreciate if you could improve the readability, but its nice to have a working computer example as a basis for coding. Please don't remove, but feel free to improve. —Preceding unsigned comment added by 216.165.95.64 (talk) 18:19, 8 September 2008 (UTC)

Misplaced Pages is not a put-here-everything kind of thing. That code adds nothing at all really, it is not even a properly written algorithm, but more a "how I can reword this article from plain English and math to using R". You're very welcome to do that kind of exercise on the side, but it adds nothing to the article. Oleg Alexandrov (talk) 20:05, 14 September 2008 (UTC)

hi

hi oleg. I am interested in non-linear differential equations. Is there a thread on this anywhere?

Bruce rout (talk) 22:43, 17 September 2008 (UTC)

We do not have threads for general discussion of topics. However, talk pages dedicated to improving an article or group of articles do exist. You might want to look at Talk:Nonlinear system. JRSpriggs (talk) 03:47, 18 September 2008 (UTC)

Square root of sum of squares?

Hi Oleg,

I am trying to implement Gauss Newton, based on the Misplaced Pages article:

http://en.wikipedia.org/Gauss%E2%80%93Newton_algorithm

and I thought that I should at least make sure that I can do the example. I used an Excel spread sheet to duplicate the algorithm given in the article. (It is amazing how poor the Excel math routines are!) In the example section, near the bottom, it says:

"The sum of squares of residuals decreased from the initial value of 1.202 to 0.0886 after the fifth iteration."

When I calculate the initial value for "sum of squares of residuals", I get 1.445497... I have to take the "square root" of that value to get the same number as stated in the article. (Then I get 1.202288.)

Is the article wrong, or am I wrong?

Thanks,

Mike --68.148.148.75 (talk) 20:15, 20 September 2008 (UTC)

You are right, in the code used to generate those numbers I was plotting the norm of the residual, so there was an extra square root. I fixed that now. Thanks. Oleg Alexandrov (talk) 08:56, 21 September 2008 (UTC)

Mathbot missing?

I was trying to manually update the list of old open AfDs, and got an error stating that "The requested URL /~mathbot/cgi-bin/wp/afd/afd.cgi was not found on this server." Did something happen to Mathbot? ···日本穣 19:13, 4 October 2008 (UTC)

Now it works. I guess the server was down. Oleg Alexandrov (talk) 21:38, 5 October 2008 (UTC)

Typoes in Mathbot's edit summaries

In Misplaced Pages:Articles for deletion/Old, Mathbot says "There are 0 open discusions in 1 days". The word "discusion" should be "discussion" with the extra "s", and it should probably say "1 day" instead of "1 days". Graham87 16:03, 24 October 2008 (UTC)

I modified the text to say

"There are 0 open discusion(s) in 1 day(s)"

Not perfect, but that's just a bot report page, could be good enough. :) Oleg Alexandrov (talk) 23:30, 1 November 2008 (UTC)

I completely forgot about this until I checked the what links here page for my username. Can you also fix the spelling error in the edit summary? "Discusions" should be "discussions", with two s's between the "u" and "i". The grammar is good enough now. Graham87 10:14, 5 November 2008 (UTC)

Gandalf's antics

Hi Oleg, user Gandalf found it fit to recommend my new article Ghosts of departed quantities for incorporation on the day it was created, and is now giving me a hard time at Uniform continuity based on a mathematical error. Could you please comment? Katzmik (talk) 10:07, 27 October 2008 (UTC)

I see a pretty lively discussion at Talk:Uniform continuity. I hope it goes well. Usually, if you want input from other editors, you can try asking at WT:WPM. Cheers, Oleg Alexandrov (talk) 23:34, 1 November 2008 (UTC)

Nice exponential function graph!

Hi. Excellent work with Image:Exp_series.gif! I feel it truly adds to the Taylor series article as it makes it much easier to understand. Keep up the good work! Greetings from Athens, Greece. --dionyziz (talk) 14:43, 30 October 2008 (UTC).

You're welcome. :) Oleg Alexandrov (talk) 23:35, 1 November 2008 (UTC)

Misplaced Pages's Expert Peer Review process (or lack of such) for Science related articles

Hi - I posted the section with the same name on my talk page. Could you take part in discussion ? User: Shotwell suggested (on my talk page) "I would endorse a WP:EXPERTADVICE page that outlined the wikipedia policies and goals for researchers in a way that enticed them to edit here in an appropriate fashion. Perhaps a well-maintained list of expert editors with institutional affiliation would facilitate this sort of highly informal review process. I don't think anyone would object to a well-maintained list of highly-qualified researchers with institutional affiliation (but then again, everyone seems to object to something)." We could start with that if you would agree ... - could you help to push his idea through Misplaced Pages bureaucracy ? Cheers, Apovolot (talk) 15:47, 1 November 2008 (UTC)

Arbcom Elections 2008

Good afternoon, Oleg. It's a slow day for me today, so I'm running through my checklist of Arbcom Election items for next month's voting. I know Mathbot has updated voting data for the last three elections, and I wanted to check and see if you planned to run it again this time around. If that's the case, is there any assistance I can provide in formatting vote pages / setting up templates / etc? Thanks in advance, UltraExactZZ ~ Evidence 18:12, 4 November 2008 (UTC)

I'll be happy to run the bot again. I hope the format is the same as last year, if not please let me know and I'll tweak the bot.

I am not that frequently on Misplaced Pages lately, so I'd appreciate a reminder say a day before the elections to get the bot set up. Cheers, Oleg Alexandrov (talk) 06:42, 5 November 2008 (UTC)