## R gets some -E-S-P-E-C-T

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NEW YORK TIMES STORY ON THE APPEAL OF R

(click to view movie)

It is no secret that Decision Science News is crazy about the R language for statistical computing. Find out why R is so great in this New York Times article. Then start to teach yourself R with our short series of video tutorials.

- Decision Science News R Video Tutorial Number 1
- Decision Science News R Video Tutorial Number 2

Addendum: Check out the hordes of R supporters in this comments of this Freakonomics blog post, correcting an assumption by Ayers that happens to be 180 degrees in the wrong direction.

Animation credit: Friend of Decision Science News Yihui Xie.

Yihui Xiesays:I’d like to contribute the draft source code for the Quincunx here (which will be included in the R package “animation” later):

par(mar = c(1, 0.1, 0.1, 0.1))

balls = 200

layers = 15

pch.layers = 2

pch.balls = 19

col.balls = sample(colors(), balls, TRUE)

cex.balls = 2

nmax = balls + layers – 2

interval = 0.05

layerx = layery = NULL

for (i in 1:layers) {

layerx = c(layerx, seq(0.5 * (i + 1), layers – 0.5 * (i –

1), 1))

layery = c(layery, rep(i, layers – i + 1))

}

ballx = bally = directx = matrix(nrow = balls, ncol = nmax)

finalx = numeric(balls)

for (i in 1:balls) {

directx[i, i] = 0

ballx[i, i] = (1 + layers)/2

if (layers > 2) {

tmp = rbinom(layers – 2, 1, 0.5) * 2 – 1

directx[i, i + 1:(layers - 2)] = tmp

ballx[i, i + 1:(layers - 2)] = cumsum(tmp) * 0.5 + (1 +

layers)/2

}

bally[i, (i - 1) + 1:(layers - 1)] = (layers – 1):1

finalx[i] = ballx[i, i + layers - 2]

}

rgx = c(1, layers)

rgy = c(0, max(table(finalx)))

for (i in 1:nmax) {

par(mfrow = c(2, 1))

plot(1:layers, type = “n”, ann = FALSE, axes = FALSE)

points(layerx, layery, pch = pch.layers)

points(ballx[, i], bally[, i], pch = pch.balls, col = col.balls, cex = cex.balls)

par(bty = “u”)

if (i < layers – 1)

plot.new()

else hist(finalx[1:(i - layers + 2)], breaks = 1:layers,

xlim = rgx, ylim = rgy, main = “”, xlab = “”, ylab = “”,

ann = FALSE, axes = FALSE)

Sys.sleep(interval)

}

January 12, 2009 @ 3:55 pm

dansays:Thanks, Yihui

January 12, 2009 @ 6:41 pm

David Smithsays:There was also a follow-up posting by the same author at the New York Times’ blog, and it has generated some lively discussion in the comments. You can find it here:

http://bits.blogs.nytimes.com/2009/01/08/r-you-ready-for-r/

January 13, 2009 @ 7:50 pm