User talk:LucasVB

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Archive0 (2006-01-24)

Image copyright problem with Image:CDMS_parameter_space_2004.png

Thanks for uploading Image:CDMS_parameter_space_2004.png. However, the image may soon be deleted unless we can determine the copyright holder and copyright status. The Wikimedia Foundation is very careful about the images included in Wikipedia because of copyright law (see Wikipedia's Copyright policy).

The copyright holder is usually the creator, the creator's employer, or the last person who was transferred ownership rights. Copyright information on images is signified using copyright templates. The three basic license types on Wikipedia are open content, public domain, and fair use. Find the appropriate template in Wikipedia:Image copyright tags and place it on the image page like this: {{TemplateName}}.

Please signify the copyright information on any other images you have uploaded or will upload. Remember that images without this important information can be deleted by an administrator. If you have any questions, feel free to contact me or ask for help at Wikipedia talk:Image copyright tags. Thank you. -- Carnildo 07:35, 6 February 2006 (UTC)[reply]

Copyrights on Image:CDMS_parameter_space_2004.png

If you were paying a little more attention, you'd have noticed that a help desk page is liking to it. Here it is. Basically, the original image was a fair use graphical plot, and I traced it by hand using a vector editor and created a PNG version of it. As I pointed out, I was wondering if the person can actually copyright the scientific data presented on the graphic. As far as I can see, nobody should be able to (it'd be considered trivial work, there's no creative content on it). The only reason it was fair use is because the original image was created directly by someone else, so I thought I could release my version on the PD.

So I'm aware of the copyright, but I decided to leave it as unknown until someone clears this out for sure. ☢ Ҡieff⌇↯ 14:08, 6 February 2006 (UTC)[reply]

I'm not a copyright lawyer, but I think your image can be released into the public domain. I'd be more comfortable if you'd re-created it from the original data rather than from an image. --Carnildo 08:42, 8 February 2006 (UTC)[reply]

Picture of the Day

Hi Kieff,

Just to let you know that your photo Image:Gospers glider gun.gif is due to make an appearance as Picture of the Day on the 12th February. If you get a chance, you can check and improve the caption at Wikipedia:Picture of the day/February 12, 2006. -- Solipsist 19:03, 10 February 2006 (UTC)[reply]

Great picture, indeed (even though it's not a photo, I guess :-) )... Thanks for making it! congratulations!! --BACbKA 09:13, 12 February 2006 (UTC)[reply]

Maps

Hi Kieff.

I noticed the map you made for Pangaea a year and a half ago. Would you consider making similar maps for Columbia (supercontinent), Rodinia, and/or Pannotia? Maps would add greatly to each. You can find reference material from Christopher Scotese (e.g. [1]) if you're willing. Thanks a lot. bcasterline^talk 20:40, 15 March 2006 (UTC)[reply]

Searching for 3 movies

Thank for responding for my question:Searching for 3 movies. You have suggested the first movie might be Buddy and it defitely look like it. The other two movies apparently are Shocker and Split Second if you wish to know. I would really like to say thank you for being so nice and responding to my question. Tutmosis 23:28, 16 March 2006 (UTC)[reply]

Pedido

Oi Kieff,

Tudo bem? Meu nome e' Fernanda Viégas e eu estudo a Wikipedia ja' ha' alguns anos (voce pode ver um dos meus papers aqui). Eu gostaria de lhe fazer algumas perguntas sobre a suas atividades como "illustrador" de artigos na Wikipedia. Eu estou super impressionada com o nivel das imagens, diagramas, e fotografias que eu tenho encontrado no site, e gostaria de aprender mais sobre a comunidade de pessoas que faz essas contribuicoes. Voce estaria disponivel p/ uma entrevista via email? — Fernanda 00:17, 4 April 2006 (UTC) | talk[reply]

Image:CDMS parameter space 2004.png

Hi, I re-tagged the image as {{PD-user}}. Renata 07:08, 13 May 2006 (UTC)[reply]

Category:Aspergian Wikipedians

Category:Aspergian Wikipedians which you have included on your user page has been proposed for deletion you can comment at Wikipedia:Categories for deletion#Category:Wikipedians by mental condition. The is also a proposal to create an association to meet the needs of users with mental health conditions. --Salix alba (talk) 18:49, 15 May 2006 (UTC)[reply]

Fair-use images removed from your gallery

Hello, Kieff. I've removed some images from your gallery and replaced them with links, as they are copyrighted images that are being used under claims of fair use. Unfortunately, by Wikipedia policies, no fair-use images can be used on user pages; please see Wikipedia:Removal of fair use images. These images have not been deleted from any articles. If you have any questions, please let me know. —Bkell (talk) 06:53, 1 July 2006 (UTC)[reply]

Re: Residents

Hi Kieff - I'm glad you like the Residents, and that I was at least partly responsible for you discovering them! If you like the residents, I'd also suggest you look for some music by Snakefinger and Renaldo and the Loaf :) Grutness...wha? 05:58, 6 July 2006 (UTC)[reply]

Incorrect normalization in Image:Synthesis square.gif

Hi, I noticed that you were the one who created this animation. Overall, it's a great illustration, but there is clearly an error in the normalization: the Fourier series must converge to the square wave, except at the point of discontinuity. In the image, your Fourier series is clearly converging to a square wave with a slightly smaller amplitude.

It looks like you chose the normalization so that the first harmonic has the same amplitude as the square wave, when actually the first harmonic should be slightly larger.

Can you please post a corrected plot? Thanks!

—Steven G. Johnson 19:06, 3 September 2006 (UTC)[reply]

Thanks

Thanks. Klepacki's linking all his interviews on his site made it pretty easy apart from organizing the entire thing. So far, it's the only computer / video game industry featured biography. --Zeality 13:51, 22 September 2006 (UTC)[reply]

Your user logo

Hi, Kieff!

I really did make an effort to retain the representation of your user name you seemed to prefer, namely Ҡi∊ff]]⌇; but seemingly this was not appreciated (since you changed it). I'm fairly new to Wikipedia (though not to mathematics), whence I do not know quite what is comme il faut. Should I in general try to copy the 'user logo's, or should I tend to use simpler and easier to read forms? An advice would be appreciated! JoergenB 19:18, 23 September 2006 (UTC)[reply]

sines

I think your questions about other ways of generating waveforms with iterated sines interesting. I found an iterated FM waveform that is somewhat like a saw wave (but not as sharp), that you might want to look at.

F_{0}(x)=\sin {x}

F_{i+1}(x)=\sin {(x+F_{i}(x))}

But also this can be smoothly varied with a sine quite easily by attenuating the offset:

F_{0}(x)=\sin {x}

F_{i+1}(x)=\sin {(x+cF_{i}(x))}

Which becomes a sine wave as c approaches zero, and becomes interestingly chaotic as c becomes greater than 1.

I'm thinking I could actually find an FM solution for a real saw wave (or an arbitrary wave), but I'll need some time to figure it out.

I also notice that you were interested in making a sin wave from square waves, which is an interesting idea. Ultimately, I believe it is impossible to do so in the manner you were attempting, but you asked then about the Fourier series, and whether it could work with things other than sine functions. Someone there mentioned that any "orthogonal basis" could be used, which isn't completely true. Harmonic square waves are orthogonal, but they're not a "complete orthogonal system" (in the Lebesgue sense). Basically, you need to be able to approximate any given continuous segment with your function, but with square waves this is impossible. You can approximate any given point, but in order to approximate a curve, you would need to introduce another square wave that puts a discontinuity in the middle of that approximated curve, and furthermore, any new wave you add that could better accomodate that curve adds new discontinuities. Anything that you can use for a fourier transform, on the other hand, can do so without the discontinuities. There are other ones than sin and cos; I've heard of a Fourier-Bessel series, and a Fourier-Legendre series, but I don't know offhand what they are used for. (Another way of looking at it is that sine and cosine have the relationship that any phase offest of a sine is equivalent to the sum of an appropriate sine and cosine. You can't do this with a square wave; there is no way to change the phase using just a square and a "cosquare".)

You could, however, make a sine wave out of an infinite number of square waves of the same period with variable phase and amplitude (or any function that repeates its first half in the second half as a negative), but this isn't any kind of Fourier series. (By combining a square wave with phase 0.1, with a negative square wave with phase 0.2, you get a pulse from 0.1 to 0.2, and its negative reflection in the second half of the cycle, with enough pulses in a fine enough interval, you can make any function with that same kind of symmetry).

I thought I'd offer a slightly different approximation to the sine using squares than yours. In this case I am still using the odd harmonics, but in this case,

\sin {x}\approx {\frac {\sqrt {2}}{2}}\sum _{n=1}^{\infty }{\frac {C_{n}S((2n-1)x)}{2n-1}}

Where S is the square wave function, and C_n is +1 or -1 depending on whether:

\sum _{m=1}^{n-1}{\frac {C_{m}}{(2m-1)}}<{\frac {1}{(2n-1)}}

C=+,-,-,-,-,-,-,+,-,-,+,-,+,-,+,-...

In this way, I am trying to keep the total sum around the fixed zero points somewhere near zero (so essentially, I am trying to approximate the sine wave by using the usual 1/n odd harmonics, but also trying to keep the two areas around 0 and pi well behaved. It ends up looking like this:

The bad areas around pi/2 and 3pi/2 don't really grow much more than that... I'm not sure if they'd tend to infinity, but I don't think so. At least, they get really, really insignificant after a while. If the C series is unreadable, think of it as a recurrance relationship:

C_{1}=1

{sum}_{1}={\frac {1}{1}}

{sum}_{n}={sum}_{n-1}+C_{n}{\frac {1}{2n-1}}

C_{n}={\begin{cases}1&({\frac {1}{2n-1}}<sum_{n-1})\\-1&({\frac {1}{2n-1}}>sum_{n-1})\end{cases}}

So, if sum keeps track of the amplitudes used so far, C determines whether the next amplitude should be added or subtracted to keep the sum closer to zero. - Rainwarrior 19:46, 26 September 2006 (UTC)[reply]

Also, if you're interested in smoothing out the Gibbs phenomenon, do you know about the Lanczos filter? - Rainwarrior 20:07, 26 September 2006 (UTC)[reply]

Villarceau circles

Your animation for Villarceau circles is so striking, that I thought it would be really neat to nominiate it for consideration at FPC! :-) --HappyCamper 04:01, 2 October 2006 (UTC)[reply]

Yup, I saw the new one but didn't think to voice an opinion. Is this good? :-) Anyway, I have been busy contacting all the people who voted on the previous image. It's nice to see them trickling back for support. --HappyCamper 14:40, 3 October 2006 (UTC)[reply]

Thanks for posting the POV source, it is always nice to have incase someone wants a larger version or for instructional purposes for people like me. -Ravedave ^{(help name my baby)} 03:06, 4 October 2006 (UTC)[reply]

One quibble is that I believe it might help if the inside surface of the torus is colored or textured so it is visibly distinct from the outside surface. --KSmrq^T 08:18, 8 October 2006 (UTC)[reply]

What do you mean? Isn't green inside and blue outside good enough? :S They look very distinct to me. Also, I DID experiment with a different texture (hexagons, stripes and plain colors), but it looked pretty boring or ambiguous, so I used checkered pattern inside too. ☢ Ҡi∊ff⌇↯ 08:53, 8 October 2006 (UTC)[reply]

(You can reply here; I'm watching.) Maybe it's a monitor/color-management thing, but I see little difference. In fact, I did not realize that different colors were used until you said so! Still, I supported its nomination as a FPC, where you can see the nice things I said. --KSmrq^T 00:16, 9 October 2006 (UTC)[reply]

Very nice and striking indeed ! One question/request: would it be possible to slow down the section action ? LouisBB 19:38, 8 January 2007 (UTC)[reply]

Sure. A few frames during the cut might make things even clearer! I'll get to it as soon as I can. — Kieff 20:44, 8 January 2007 (UTC)[reply]

image requests

I vaguely remember you asking for suggestions for mathematical images to do a while back, so here are a couple of possibilities:

Lakes of Wada could do with a picture (of the lakes of Wada).
Wilkinson's polynomial could do with an animation of how the roots move in the complex plane as the coefficient of x^19 is changed.

R.e.b. 05:24, 7 October 2006 (UTC)[reply]

I found a crude picture of the lakes of Wada in J. G. Hocking, G. S. Young, Topology ISBN 0486656764 on page 144, but it's probably not that much use to you. An animation of the lakes growing day by day would be even better than a picture, but this may not be worth the effort, as it's a rather obscure topic. Some of the external links already have pictures of infinite spherical reflections, so a picture of this is not needed. R.e.b. 21:07, 9 October 2006 (UTC)[reply]

I tried to draw a crude image of the lakes for you, but got carried away and ended up with something good enough to add to the Lakes of Wada article. Though it could still be animated if you are short of things to do.... R.e.b. 16:12, 11 October 2006 (UTC)[reply]

Gimbal lock figure

A single gimbal mount can be a semicircle, rather than a full circle. This may simplify the figure and make the essential features easier to notice.

The essence of physical gimbal lock is that the inner and outer axes become aligned, so that the body is free to rotate around two independent axes, but no longer around three. The essence of mathematical gimbal lock is a topological problem, discussed in this thread from news:comp.graphics.algorithms. I assume you wish to illustrate the physical version.

An inability to rotate in a certain way is a tactile phenomenon, not a visual one. A static illustration could simply show the aligned situation that corresponds to lock. An animation might show the effect of wiggling each axis in turn in a configuration away from lock, and then contrast that with a locked configuration.

However, if you want to try the tactile idea, you might somehow depict torque magnitudes. --KSmrq^T 08:05, 8 October 2006 (UTC)[reply]

Could you update the "Garden of eden" (Conway's Game of Life) picture?

Howdy! I noticed that this picture: is out of date now... somebody has found a smaller pattern. I hope you know what I'm talking about... Here is a link to the page: http://pentadecathlon.com/lifenews/2006/03/smaller_garden_of_eden_pattern.html I would do it myself, but I have no idea how.Count Olaf 21:49, 14 October 2006 (UTC)[reply]

Congrats!

I hereby award Kieff the Barnstar of Science and Mathmatics for his great contributions (including amazing .gifs) to Math articles! NauticaShades^(talk) 12:03, 8 October 2006 (UTC)[reply]

Featured picture promotion!

An image created by you has been promoted to featured picture status Your image, Image:Villarceau circles.gif, was nominated on Wikipedia:Featured picture candidates, gained a consensus of support, and has been promoted. If you would like to nominate an image, please do so at Wikipedia:Featured picture candidates. Thank you for your contribution! KFP (talk | contribs) 15:48, 9 October 2006 (UTC)[reply]

This is to let you know the Featured Picture you uploaded and/or nominated Image:Villarceau circles.gif is scheduled to be Picture of the day on January 8, 2007, when it will be featured on the Main Page. Congratulations! howch e ng {chat} 17:43, 8 December 2006 (UTC)[reply]

Pi-unrolled

I created (and linked from FPC) a gallery of all versions of this graphic. I hope you won't take it the wrong way when I say that it's really messy to have four or five versions of an animation all on one page. I don't want to kick you off but would you consider taking out not only your version but also all previous versions, leaving only Image:Pi-unrolled-720.gif? The outcome of the nom seems certain and I'd rather not see it closed and archived with so much animation on the page. If you agree, I'll ask you to do the refactoring, please, to your taste. You're also welcome, as the creator, to edit the comment attached to your version in the gallery. Thank you. John Reid 21:58, 14 October 2006 (UTC)[reply]

Image:Pattonb.jpg

hi, can you take a look at Image:Pattonb.jpg and specify which tag it should be tagged with? It is a nice little improvement of an image and would make articles look better, but if there is no tag, then other users might remove it arbitrarily. I note that the previous user mentioned public domain. Can you throw some light on it since you've worked on the image, who has the copyrights now? Idleguy 07:12, 5 November 2006 (UTC)[reply]

Stellar classification

I really liked the star catigory picture, is there any chance I can get the pov-ray source code for them? my email is [email removed] -- Blake6489 06:55, 26 November 2006 (UTC)[reply]

I'm sorry, but it won't be available for now. I'm using it in some big project and I need to finish it before I can release anything to the public. Thanks for the compliment! ☢ Ҡi∊ff⌇↯ 06:59, 26 November 2006 (UTC)[reply]

I just saw this picture. Would you mind if I nominate it at Wikipedia:Featured picture candidates? --Dgies 22:43, 11 December 2006 (UTC)[reply]

Graphics Lab

I saw your name listed on Wikiproject Illustration or the list of graphic artists, and I thought I'd let you know that a Graphics Lab has been created on EN. Based on the highly successful French and German graphics labs, it seeks to better organise and coordinate our graphic design and photo-editing efforts. Up until now, there has been no common space on EN where users could ask for maps, charts and other SVG files to be created. What's more, the Graphics Lab has discussion boards, tips, tools and links; in sum, a good common workspace. Come help us out! The infrastucture is already in place, and now we need participants. :) --Zantastik talk 02:09, 12 December 2006 (UTC)[reply]

Your signature

Just to let you know, I don't have some of the fancy fonts used in your signature, so everything you sign seems to start with a question mark, instead. This led to a misunderstanding on the Misc Ref Desk, where I thought you were unsure of your Sun Tsu answer, so added my own. If I'd known you were certain, I wouldn't have answered. Of course, fancy sigs also make edits messy, as those sigs often take up several lines of text. I can't tell you what you should or shouldn't put in your sig, but did want you to be aware of some of the issues, so you can "make an informed decision". Thanks, StuRat 15:54, 18 December 2006 (UTC)[reply]

IMDb name template

Hi -

I noticed you listed your talk page as a place to ask for help with the {{imdb name}} template. I've made extensive revisions to the instructions; this is to ask two things:

Would you please review the instructions I've revised at Template:Imdb name/doc for accuracy and clarity?, and
Do you still want to be listed as a contact for people having problems with using the template?

I'll put your talk page on my watchlist; I'd prefer that you respond here to keep the dialogue in one place. Thanks.—Chidom ^talk 19:31, 6 January 2007 (UTC)[reply]

Brazilian Portuguese Hitchhiker's fan site?

Do you happen to have a working link? I saw the link on hhgttgonline.com, but I got a domain not found error, and not a working website. --JohnDBuell 18:42, 7 January 2007 (UTC)[reply]

Well, first of all, I added the Brazilian Portuguese in that list because, as I understood, the paragraph was mentioning relevant websites from past and present.

That being said, no, I don't have a link. Not officially (but check my historical page of it). Milliways Brasil is dead. Since Milliways was the first and only DNA\HHGG website from Brazil and existed for a year with quite a few followers, I thought it qualified for the mention. I was the owner, by the way. When I was promoting the movie, the book and Douglas Adams around here, I even started a "Towel Campaign" in which people would attent to theaters with their towels (it included 42 good, humorous reasons to do so.) Back then, I was having at least 36 different Brazilian blogs linking to the website, plus some Orkut links. I think it was notable enough around here (considering the minimal fanbase we had back then), and I had a few official contacts, like the Brazilian Portuguese official book translator and the Brazilian distribution manager at Buena Vista International - who actually sent me 5 shiny Brazilian posters before anyone else. Given all this, I thought it qualified for the list (but I may be biased, of course), so I mentioned the Brazilian Portuguese language fansite on the list, even if it doesn't exist anymore.

Hope that clears everything up. In any case, I removed the mention since it looks like I misunderstood the paragraph anyway. — Kieff 20:01, 7 January 2007 (UTC)[reply]

Actually we could re-include that with a slight re-write. Wasn't there an Italian one for a while too? --JohnDBuell 21:38, 7 January 2007 (UTC)[reply]

Koch Cube

Thanks for helping me with the "Koch cube" question. Having used the great marvel that is Google, I found [2]. It seems you were correct. --AMP'd 04:35, 12 January 2007 (UTC)[reply]

How to make animations

Hi Kieff,

I saw some of your animations. So far I have made a number of 2D-animations, such as the ones in the rotational-vibrational coupling article. I also have a website of my own, this article contains some of my attempts at semi-3D animations.

I would love to create animations for the mass flow meter article, animations that match or surpass the quality of the animations on the website of a manufacturer of mass flow meters, for example the curved tube mass flow meter animation.

I'd like to ask you if you can assist me with getting started with POV-ray. --Cleonis | Talk 15:57, 14 January 2007 (UTC)[reply]

[...]

Nice to see you're interested in POV-Ray, it's quite a nice program, especially for those into mathematics and programming. :)

The thing is, POV-Ray is a lot more low-level than most people realize. You have to get your hands in a lot of math to make things move nicely and look nicely, which is exciting and challenging. But since we're talking mostly about diagrams and models here, most animations won't be too complex.

[...]

Good luck, and don't hesitate to ask for further help! — Kieff 05:12, 15 January 2007 (UTC)[reply]

Generally, I want control over what the program does rather than extensive automation. For example, I write my website in HTML. Using a WYSIWYG editor doesn't suit my way of thinking around problems. So the fact that in using POV-ray I must get my hands in the math will suit me, I think.

Thank you for the descriptions you put up on my Talk page. If I get stuck I will seek your help. --Cleonis | Talk 16:09, 15 January 2007 (UTC)[reply]

Thanks

Thanks for your Wikipedia tips after my blundering around the Tesla Coil article. I saw the "you have mail" thing and I figured it would hurt. What a nice surprise!!!

72.72.37.51 23:39, 15 January 2007 (UTC)Packer[reply]

Sculpting a sphere

Hope the comments here helped with your project!Please let me know if none of them worked and I'll set my slow but steady mind to it!Bioarchie1234 21:27, 18 January 2007 (UTC)[reply]