# No subject

Niels Waller ngwaller at ucdavis.edu
Sat Nov 28 20:42:04 CET 1998

```Dear Friends,

Yesterday I posed a question to the list concerning the possibility of doing
animation examples in R.  Here is an example S-Plus (4.5 for Windows ) that
I wrote to illustrate my problem.  If I try this in R (comment out the
graphsheet and guilocator calls) I don't see my results until after the
function has iterated through the 100 trials.  I would like to plot each
iteration.

Any suggestions would be greatly appreciated.  I am running R 63.0 (Guido's

Niels

> Quincunx.prg
function(trials = 100)
{
graphsheet(pages = "Off")
par(mfrow = c(1, 2))
xpoints <- seq(1, 25, 1)
ypoints <- seq(1, 25, 1)
xheights <- rep(0, 25)
mcol <- 2
xy <- expand.grid(xpoints, ypoints)
xx <- seq(1, 25, 2)
yy <- rep(0, 25)
ypos <- ypoints + 0.4
HT <- c("H", "T")
for(j in 1:trials) {
plot(xpoints, ypoints, type = "n", xlab = "", ylab = "", axes = F, main =
"Galton's Quincunx")
points(x = xy[, 1], y = xy[, 2], pch = 5, col = 1)
marble.path <- sample(HT, 25, replace = T)
xpos <- 13
points(xpos, ypos[25], pch = 16, col = 8)
for(i in 1:24) {
if(marble.path[i] == "H")
xpos <- xpos + 1
else xpos <- xpos - 1
if(xpos > 25)
xpos <- 25
if(xpos < 0)
xpos <- 0
points(xpos, ypos[25 - i], pch = 16, col = 8)
}
xheights[xpos] <- xheights[xpos] + 1
text(x = xpoints[xx], y = yy[xx], labels = as.character(xheights)[xx])
plot(xpoints[xx], xheights[xx], ylim = c(0, trials/2), type = "h", main =
paste("Trials = ", j, sep = ""), ylab = "Frequency",
xlab = "X")
guiLocator(-1)
}
}

********************************************************************
Niels Waller, Ph.D.
Associate Professor

Address: One Shields Avenue      Phone: (530) 752-4459
Department of Psychology
University of California
Davis, CA 95616

Internet:
http://psychology.ucdavis.edu/waller/default.html

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```