User talk:FlyingLeopard2014/Archives/2013/FY

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Wikipedia Day Celebration and Mini-Conference in NYC Saturday Feb 23

Doing the "Open Space" thing at one of our earlier NYC Wiki-Conferences.

You are invited to celebrate Wikipedia Day and the 12th anniversary (!) of the founding of the site at Wikipedia Day NYC on Saturday February 23, 2013 at New York University; sign up for Wikipedia Day NYC here, or at bit.ly/wikidaynyu. Newcomers are very welcome! Bring your friends and colleagues!

We especially encourage folks to add your 5-minute lightning talks to our roster, and otherwise join in the "open space" experience!--Pharos (talk) 02:53, 2 January 2013 (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) 22:22, 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)

Domain of definition

The convolution of two complex-valued functions on R^d

$(f*g)(x)=\int _{\mathbf {R} ^{d}}f(y)g(x-y)\,dy$

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 g_N is periodic, with period N, then for functions, f, such that f∗g_N 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

Main article: Circular convolution

When a function g_T is periodic, with period T, then for functions, f, such that f∗g_T 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 t_o 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.

Wikipedia Meetup NYC this Sunday April 14

Hi NHRHS2010! You're invited to our next meeting for Wikipedia Meetup NYC on Sunday April 14 -this weekend- at Symposium Greek Restaurant @ 544 W 113th St (in the back room), on the Upper West Side in the Columbia University area.

Please sign up, and add your ideas to the agenda for Sunday. Thanks!

Delivered on behalf of User:Pharos, 17:50, 10 April 2013 (UTC)

Citing references

How do I cite a reference? I have had error messages regarding this. Ribonucleicacid563 02:35, 6 May 2013 (UTC)Ribonucleicacid563 — Preceding unsigned comment added by Ribonucleicacid563 (talk • contribs)

RfC:Infobox Road proposal

WP:AURD (Australian Roads), is inviting comment on a proposal to convert Australian road articles to {{infobox road}}. Please come and discuss. The vote will be after concerns have been looked into.

• Wikipedia:WikiProject Australian Roads/RfC:Infobox Road proposal

You are being notified as a member on the list of WP:HWY

Nbound (talk) 22:57, 8 May 2013 (UTC)

Love history & culture? Get involved in WikiProject World Digital Library!

World Digital Library Wikipedia Partnership - We need you!

Hi FlyingLeopard2014! I'm the Wikipedian In Residence at the World Digital Library, a project of the Library of Congress and UNESCO. I'm recruiting Wikipedians who are passionate about history & culture to participate in improving Wikipedia using the WDL's vast free online resources. Participants can earn our awesome WDL barnstar and help to disseminate free knowledge from over 100 libraries in 7 different languages. Multilingual editing encouraged!!! But being multilingual is not a necessity to make this project a success. Please sign up to participate here. Thanks for editing Wikipedia and I look forward to working with you! 20:02, 24 May 2013 (UTC)

NYC Wiki-Picnic: Saturday June 22

	Great American Wiknic NYC at Prospect Park
	You are invited to the Great American Wiknic NYC in Brooklyn's green and lovely Prospect Park, on this Saturday June 22! We would love to see you there, so sign up and bring something fun for the potluck :) -- User:Pharos (talk)

Hello

Hi, my name is User:ArsenalFan700 (on wiki only of course) and the reason I am here on your talk page is because, like you, I am also a Highlander and honestly I never thought I see another Highlander on wiki. Currently I am an incoming senior, so, ya... Class of 2014 is automatically better than yours :p. But seriously, it is great to know that I am not the only highlander here on wiki and I thought I say hi. Okay, cheers. (PS: You were in the same graduating class as my sister so I may have seen you before.) --ArsenalFan700 (talk) 01:12, 4 July 2013 (UTC)

Ha, I actually have the 2010 April/May Fling edition (which has the seniors and their uni's) so I can probably find out if I wanted (I won't, don't worry). And yes, I have dealt with many Highlander vandals here sadly. I almost got blocked by one during an edit war (I was in the room at the time as well, somehow the kid did not know it was me undoing his edits. I even left hints). Clever username though, represent that tough yet pleasant building. Cheers and good luck with what I suspect will also be your senior year, but in college. --ArsenalFan700 (talk) 16:56, 4 July 2013 (UTC)

Nah, I don't want to do that. I mean, first of all, the IP Address is already blocked last time I checked, and secondly, it is not that bad of vandalism. Cluebot has that sorted out easy. I do find people though at the school making a fake account and then doing something stupid like making themselves some fake page or something like that. For some reason, they usually edit using the IP and that is how I know. --ArsenalFan700 (talk) 19:19, 4 July 2013 (UTC)