Copyto does not only keep urls of your bookmarks. You will be able to select all or some of the content on your bookmarked page to save it as long as you want. This way you will never lose the content on your bookmarked page even if the original page goes down or gets updated. We give you three lovely browser extensions, for Google Chrome, Mozilla Firefox and Safari. While you are browsing you wil

平均値 $n$ 個の数値 $x_1$，$x_2$，...，$x_n$ が与えられたとき，これらの値を代表する値（代表値）として最もよく使われるのが平均値（mean，average） \[ \bar{x} = \frac{x_1 + x_2 + \cdots + x_n}{n} \] です。$\bar{x}$（エックス・バー）は $x$ の平均値を意味します。 平均値を意味する英語は mean と average の二通りがあります。平均値を求めるのにExcelでは average() という関数を使いますが，Rでは短いほうの mean() が関数名になっています。 > x = c(0, 7, 8, 9, 100) > mean(x) [1] 24.8 上で定義したものを相加平均または算術平均（arithmetic mean）ともいいます。これに対して，積の $n$ 乗根 \[ \sqrt[

Abstract: We study several longstanding questions in media communications research, in the context of the microblogging service Twitter, regarding the production, flow, and consumption of information. To do so, we exploit a recently introduced feature of Twitter---known as Twitter lists---to distinguish between elite users, by which we mean specifically celebrities, bloggers, and representatives o

Okay.. fair warning: I'm venting. I just had an long and very frustrating conversation with a young programmer who recently discovered functional programming, and thinks it can solve every problem in the world. Before I go any farther, let me make one thing clear: I do not hate functional programming. On the contrary, I agree with every guru out there who says that you can't become a Real Programm

That’s awesome! But maybe you don’t know where to start. So here we go! Wait, the what? Structure and Interpretation of Computer Programs, a.k.a. the SICP, is an MIT class teaching computer languages turned into a book. Why should you care? I’ll let Stack Overflow answer: Some classics […] teach you the effective working habits and the painstaking details of the trade. Others […] delve into the ps