User talk:RapidR

Greece earthquake
No problem. If you are more experienced than me in the subject I believe you. Just correct the main article as well and not only the infobox. -- Magioladitis (talk) 17:51, 6 January 2008 (UTC)

Greenpeace
How did I vandalise? I clearly stated what they are.

77.86.119.209 (talk) 15:34, 20 May 2008 (UTC)

Neutral?
I edited the article because it seemed to insult uncyclopedia. Which would mean the article isn't neutral. (Bbarth26 (talk) 21:29, 1 July 2008 (UTC))

Earthquake article
Thanks for removing the earthquake list from the article. I felt that as Editorofthewiki had removed the list originally without discussion, albeit that I agreed with him 100%, it would be good to have some sort of consensus so that, if it reappears in the future, we can remove immediately with reference to the talk page. Mikenorton (talk) 10:12, 19 July 2008 (UTC)

You are invited...
to join the Earthquakes Wiki! Any questions can be directed to my talk page. -- Meldshal  (§peak to me)  14:10, 30 July 2008 (UTC)

Railway electrification in Great Britain
I have reverted the edit that you made becuase of a lack of a source for your information. The majority of the system is a 650 V system. The only section that might be operated at 750V is the section from Hooton to Chester/Ellesmere Port. If you can provide a reference for your claim, then please feel free to change the article.Olana North (talk) 08:04, 31 July 2008 (UTC)


 * Thanks for your reply. I am willing to give you the benefit of the doubt, but I remain unconvinced. The Class 507/508's might be 750V units, but they will run quite happily on 650V. In fact, the voltage of the inner area of London is actually a 660V system, it changes to a 750V system as you leave the capital.   Similarly, the 507/508's will also run on 650V, but perhaps a little slower. I shall do some digging myself, and see if I can find something more conclusive.  Regards. Olana North (talk) 18:41, 31 July 2008 (UTC)

You may wish to know
Since you are a member of WikiProject Earthquakes, you may wish to know about this. --I'm an Editorofthewiki[citation needed] 18:37, 5 August 2008 (UTC)

WikiProject Earthquakes Newsletter (August 2008)

 * Newsletter delivery by -- Lord   ₪   Sunday   20:10, 26 August 2008 (UTC)

Oxford Wikimania 2010 and Wikimedia UK v2.0 Notice
Hi,

As a regularly contributing UK Wikipedian, we were wondering if you wanted to contribute to the Oxford bid to host the 2010 Wikimania conference. Please see here for details of how to get involved, we need all the help we can get if we are to put in a compelling bid.

We are also in the process of forming a new UK Wikimedia chapter to replace the soon to be folded old one. If you are interested in helping shape our plans, showing your support or becoming a future member or board member, please head over to the Wikimedia UK v2.0 page and let us know. We plan on holding an election in the next month to find the initial board, who will oversee the process of founding the company and accepting membership applications. They will then call an AGM to formally elect a new board who after obtaining charitable status will start the fund raising, promotion and active support for the UK Wikimedian community for which the chapter is being founded.

You may also wish to attend the next London meet-up at which both of these issues will be discussed. If you can't attend this meetup, you may want to watch Meetup, for updates on future meets.

We look forward to hearing from you soon, and we send our apologies for this automated intrusion onto your talk page!

Addbot (talk) 21:17, 30 August 2008 (UTC)

September Newsletter
The September version of the WikiProject Earthquakes newsletter has been posted! Be sure to check it out! &mdash; Ceran  thor  [Formerly LordSunday] 14:13, 4 October 2008 (UTC)

Earthquakes Newsletter
Be sure to check out the October version of the WikiProject Earthquakes Newsletter for updates and news. Thanks, &mdash;  Ceranthor   ( Sing ) 23:17, 30 October 2008 (UTC)

1556 Shaanxi earthquake
I don't dispute that the date for the 1556 Shaanxi earthquake is January 23 rather than February 14, which is the date that was on the article until today, but could you provide some citation? Thanks. Inter lingua 05:01, 24 January 2009 (UTC)

List of recent earthquakes
Hi RapidR, Thanks for your help in sorting out this list. If you want to rename it '21st century' I've no real objection although I don't see an urgent need only nine years into the century. I was beginning to wonder if anyone had noticed the fairly major changes I was making to the various earthquake lists, so your contribution came as a relief.

The last change I have planned is to the List of earthquakes which is now almost completely redundant. My suggestion is to remove the USGS significant quake list (now fully duplicated), perhaps keep the two top ten lists but otherwise just keep it as a 'list of lists' for earthquakes, renaming it as Lists of earthquakes. I would appreciate your views on this. Cheers, Mikenorton (talk) 15:10, 1 June 2009 (UTC)


 * OK, that's all fine with me, pretty much what I was thinking. Have fun with the 2008 list, I almost lost the will to live going through that:-), I think that there's a lot of non-notable stuff there, at least for a global list, Cheers Mikenorton (talk) 20:20, 1 June 2009 (UTC)

20-year anniversary of Loma Prieta
I'm going to try and hurry the 1989 Loma Prieta earthquake article through both GA and FA to see if I can get it as the Featured Article on the Main Page in time for its 20-year anniversary on October 18, 2009. Care to help a little or a lot? Binksternet (talk) 02:40, 30 August 2009 (UTC)

Earthquakes Project Newsletter
The WikiProject Earthquakes newsletter for September 2009 has been released. Be sure to check on our status.  ceran  thor 11:42, 31 August 2009 (UTC)

Dead link in article 'Railway electrification in Great Britain'
Hi. I tried to fix the dead links in 'Railway electrification in Great Britain', but there was one that I couldn't fix. I marked it with Dead link. Can you help fix the last dead link?

Dead: http://www.nedrailways.com/html/merseyrailkeyfacts.html Please take a look at that article and fix what you can. Thank you!
 * You added this in July 2008.
 * I tried to load this link on 30 March, 1 April, 3 April and today, but it never worked.
 * I looked in The Wayback Machine and WebCite but I couldn't find a suitable replacement.

PS- you can opt-out of these notifications by adding to your user page or user talk page. BlevintronBot (talk) 03:08, 7 April 2012 (UTC)

Examples of convolution
I saw the wiki page, but I couldn't find any examples using actual numbers evaluating the formula. Could you give some examples of convolution, please? Mathijs Krijzer (talk) 22:13, 9 March 2013 (UTC)

Definition
The convolution of f and g is written f∗g, using an asterisk or star. It is defined as the integral of the product of the two functions after one is reversed and shifted. As such, it is a particular kind of integral transform:




 * $$(f * g )(t)\ \ \,$$
 * $$\stackrel{\mathrm{def}}{=}\ \int_{-\infty}^\infty f(\tau)\, g(t - \tau)\, d\tau$$
 * $$= \int_{-\infty}^\infty f(t-\tau)\, g(\tau)\, d\tau.$$      (commutativity)
 * }
 * $$= \int_{-\infty}^\infty f(t-\tau)\, g(\tau)\, d\tau.$$      (commutativity)
 * }

Domain of definition
The convolution of two complex-valued functions on Rd
 * $$(f*g)(x) = \int_{\mathbf{R}^d}f(y)g(x-y)\,dy$$

is well-defined only if f and g decay sufficiently rapidly at infinity in order for the integral to exist. Conditions for the existence of the convolution may be tricky, since a blow-up in g at infinity can be easily offset by sufficiently rapid decay in f. The question of existence thus may involve different conditions on f and g.

Circular discrete convolution
When a function gN is periodic, with period N, then for functions, f, such that f∗gN exists, the convolution is also periodic and identical to:


 * $$(f * g_N)[n] \equiv \sum_{m=0}^{N-1} \left(\sum_{k=-\infty}^\infty {f}[m+kN] \right) g_N[n-m].\,$$

Circular convolution
When a function gT is periodic, with period T, then for functions, f, such that f∗gT exists, the convolution is also periodic and identical to:


 * $$(f * g_T)(t) \equiv \int_{t_0}^{t_0+T} \left[\sum_{k=-\infty}^\infty f(\tau + kT)\right] g_T(t - \tau)\, d\tau,$$

where to is an arbitrary choice. The summation is called a periodic summation of the function f.

Discrete convolution
For complex-valued functions f, g defined on the set Z of integers, the discrete convolution of f and g is given by:


 * $$(f * g)[n]\ \stackrel{\mathrm{def}}{=}\ \sum_{m=-\infty}^\infty f[m]\, g[n - m]$$
 * $$= \sum_{m=-\infty}^\infty f[n-m]\, g[m].$$      (commutativity)

When multiplying two polynomials, the coefficients of the product are given by the convolution of the original coefficient sequences, extended with zeros where necessary to avoid undefined terms; this is known as the Cauchy product of the coefficients of the two polynomials.

ArbCom elections are now open!
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