Iterative method. In computational mathematics, an iterative method is a mathematical procedure that generates a sequence of improving approximate solutions for a class of problems.
A specific implementation of an iterative method, including the termination criteria, is an algorithm of the iterative method. An iterative method is called convergent if the corresponding sequence converges for given initial approximations. A mathematically rigorous convergence analysis of an iterative method is usually performed; however, heuristic-based iterative methods are also common. In the problems of finding the root of an equation (or a solution of a system of equations), an iterative method uses an initial guess to generate successive approximations to a solution. In contrast, direct methods attempt to solve the problem by a finite sequence of operations. Attractive fixed points[edit] Linear systems[edit]
Méthode itérative. Un article de Wikipédia, l'encyclopédie libre.
Tit for tat. In Western business cultures, a handshake when meeting someone is an example of initial cooperation.
Tit for tat is an English saying meaning "equivalent retaliation". It is also a highly effective strategy in game theory for the iterated prisoner's dilemma. The strategy was first introduced by Anatol Rapoport in Robert Axelrod's two tournaments,[1] held around 1980. Notably, it was (on both occasions) both the simplest strategy and the most successful.[2] An agent using this strategy will first cooperate, then subsequently replicate an opponent's previous action.
Implications[edit] The success of the tit-for-tat (TFT) strategy, which is largely cooperative despite that its name emphasizes an adversarial nature, took many by surprise. Moreover, the TFT strategy has been of beneficial use to social psychologists and sociologists in studying effective techniques to reduce conflict. Problems[edit]
Coopération-réciprocité-pardon. Un article de Wikipédia, l'encyclopédie libre.
COMPARATIF Pearltrees Racine V1 & V2 ;-( Recherche Images - pearltrees. Pearltrees releases a new version, without any pearls nor trees. The Paris-based startup founded in 2009 once declared: “We focus on the visual potential of Pearltrees to let people dive deeply into their interests and nearly feel them”.
Their product, offering a digital curation tool, was unique because of the visual interface voluntareely original: links and folders symbolized by rounded pearls attached together like the branches of a tree. Today, pearls and trees have disappeared to make room for a brand new and larger organisation tool. Two years ago, everyone wanted to build products around “curation” and “interest graph”. Today the keywords have shifted to “collaborative SaaS tool” and “organizing data”. Pearltrees, who has raised €8,5 million in two rounds, is renewing itself to match the new trends by releasing a new version focused on organization of collections in a more “obvious” way. Why giving up the core of the product, after 4,5 years of existence and 1,7 million users? Pearltrees helps you to organize the web - visually.
Pearltree de la petite souris. PT2S Members. Pearltrees 2 sucks! Angry / disappointed users. Passage PEARLTREES V1 à V2 -Mai 2014. Pt 2.0 WTF?!!! What do they mean by "Democratize"? PEARLTREES, et si c'était l'outil de curation par excellence ? G-translate: Petition for the return of Pearltrees 1. Pearltrees, the brain of the web? Something doesn't add up. Pearltrees V1 - No New Users. Square pearls. Pearltrees Alternatives. Rendez-nous nos perles ! Pearls galaxy...0.0.1. Espace3. Histoire de Perles. Users feedback team @loomio. Beyond pearltrees... Users for ideas... Team. Loomio - An Occupy-Inspired App That Helps Groups Make Actual Group Decisions. If you've ever tried to make a tough decision with a group of people online, then you've most likely done one of two things.
You may have had a discussion over email, in which case the conversation has gotten very messy and it becomes difficult to suss out exactly where everyone stands. Or, you could have tried a poll, which doesn't give the opportunity for re-working proposals based on feedback. Neither of these options really unleashes the creative power of individuals working collaboratively to solve a problem. And there are no existing online tools that really fit the bill. IBM says Learn From Your Customers! for usable Web apps. Imagine the following scenario: You go shopping to buy a loaf of bread.
The shops look gorgeous, decked out in vivid colors and stunning artwork. Trouble is, you can't always tell from the window displays what sort of products are on sale inside. Eventually, you find a shop that looks promising and ignore advice that this store's expertise is with a gadget you don't own. You find the front door and wander in. Now you enter a maze of aisles containing products organized in an apparently random manner. Before paying, you attempt to ascertain that you can use your credit card safely, but the inscrutable small print has more to say about your legal obligations than reassurance about your security.
The Democratization of Content « The Connected Wire. (This post originally appeared on The Connected Wire) As the internet becomes even more ubiquitous, more services are becoming available that make it even easier to create and distribute content.
Services like Google Music, iTunes, and cdbaby allow anyone to sell their music with no obstacles and as computers become even more powerful, anyone can create professional level content easily. This is going to (and in many cases already is) radically change the way we consume content. Every type of media is going to have a few changes that will completely change the industry. 1. 2. 3. It is becoming even easier to make great videos, since the prices for quality cameras plummeting and computer software is becoming increasingly powerful. Now that anyone can make great videos, it becomes extremely difficult to find ones of good quality. Take TWiT.tv as an example. Music This is an industry where the affects of the internet is much more obvious. Then came the internet. Books The future.