User talk:Edward Z. Yang

After encountering some users who opt to reply on their own talk pages (and for some very good reasons), I have come to a conclusion: a compromise. If you initiate a discussion on my talk page, I will reply on my talk page, but, I will notify you on your talk page via a short statement (ex. ==RE: Subject== See reply on my talk page) and will do this every time a post a reply. This way, not only are conversations not fragmented, but you will know if I've acknowledged your comment. This will not be done if the conversation will probably only consist of a question and a reply. Promote good etiquette on talk pages! (Archives: 2004, 2005, 2008)

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Annotations Extension
Hi! I am the developer of a WikiPraise UserScript. May I have a look into the sources of your extension? It may be very interesting for further research. What is the format of the data your extension provides? -- NetAction (talk) 13:38, 19 September 2011 (UTC)


 * See the attachments to https://bugzilla.wikimedia.org/show_bug.cgi?id=639 . Though it probably makes more sense to take advantage of existing annotation engines like those seen in Git. &mdash; Edward Z. Yang (Talk) 01:18, 20 September 2011 (UTC)

MSU Interview
Dear Edward Z. Yang,

My name is Jonathan Obar user:Jaobar, I'm a professor in the College of Communication Arts and Sciences at Michigan State University and a Teaching Fellow with the Wikimedia Foundation's Education Program. This semester I've been running a little experiment at MSU, a class where we teach students about becoming Wikipedia administrators. Not a lot is known about your community, and our students (who are fascinated by wiki-culture by the way!) want to learn how you do what you do, and why you do it. A while back I proposed this idea (the class) to the communityHERE, where it was met mainly with positive feedback. Anyhow, I'd like my students to speak with a few administrators to get a sense of admin experiences, training, motivations, likes, dislikes, etc. We were wondering if you'd be interested in speaking with one of our students.

So a few things about the interviews:
 * Interviews will last between 15 and 30 minutes.
 * Interviews can be conducted over skype (preferred), IRC or email. (You choose the form of communication based upon your comfort level, time, etc.)
 * All interviews will be completely anonymous, meaning that you (real name and/or pseudonym) will never be identified in any of our materials, unless you give the interviewer permission to do so.
 * All interviews will be completely voluntary. You are under no obligation to say yes to an interview, and can say no and stop or leave the interview at any time.
 * The entire interview process is being overseen by MSU's institutional review board (ethics review). This means that all questions have been approved by the university and all students have been trained how to conduct interviews ethically and properly.

Bottom line is that we really need your help, and would really appreciate the opportunity to speak with you. If interested, please send me an email at obar@msu.edu (to maintain anonymity) and I will add your name to my offline contact list. If you feel comfortable doing so, you can post your nameHERE instead.

If you have questions or concerns at any time, feel free to email me at obar@msu.edu. I will be more than happy to speak with you.

Thanks in advance for your help. We have a lot to learn from you.

Sincerely,

Jonathan Obar --Jaobar (talk) — Preceding unsigned comment added by Chlopeck (talk • contribs) 23:16, 14 February 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) 22:14, 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.

Notification of pending suspension of administrative permissions due to inactivity
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An RfC that you may be interested in...
As one of the previous contributors to Infobox film or as one of the commenters on it's talk page, I would like to inform you that there has been a RfC started on the talk page as to implementation of previously deprecated parameters. Your comments and thoughts on the matter would be welcomed. Happy editing!
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Following a community discussion in June 2011, consensus was reached to provisionally suspend the administrative permissions of users who have been inactive for one year (i.e. administrators who have not made any edits or logged actions in over one year). As a result of this discussion, your administrative permissions will be removed pending your return if you do not return to activity within the next several days. If you wish to have these permissions reinstated should this occur, please post to the Bureaucrats' noticeboard and the userright will be restored per the re-sysopping process (i.e. as long as the attending bureaucrats are reasonably satisfied that your account has not been compromised, that your inactivity did not have the effect of evading scrutiny of any actions which might have led to sanctions, and that you have not been inactive for a three year period of time). If you remain inactive for a three year period of time, including the present year you have been inactive, you will need to request reinstatement at WP:RFA. This removal of access is procedural only, and not intended to reflect negatively upon you in any way. We wish you the best in future endeavors, and thank you for your past administrative efforts. MadmanBot (talk) 00:51, 27 March 2014 (UTC)

Suspension of administrative permissions due to inactivity
Following a community discussion in June 2011, consensus was reached to provisionally suspend the administrative permissions of users who have been inactive for one year (i.e. administrators who have not made any edits or logged actions in over one year). As a result of this discussion, your administrative permissions have been removed pending your return. If you wish to have these permissions reinstated, please post to the Bureaucrats' noticeboard and the userright will be restored per the re-sysopping process (i.e. as long as the attending bureaucrats are reasonably satisfied that your account has not been compromised, that your inactivity did not have the effect of evading scrutiny of any actions which might have led to sanctions, and that you have not been inactive for a three year period of time). If you remain inactive for a three year period of time, including the present year you have been inactive, you will need to request reinstatement at WP:RFA. This removal of access is procedural only, and not intended to reflect negatively upon you in any way. We wish you the best in future endeavors, and thank you for your past administrative efforts. –xeno talk  17:30, 7 April 2014 (UTC)

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ArbCom elections are now open!
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