[R] Re:

[Kjetil Halvorsen]

Try the following:

 Quincunx.prg  <-  
function(trials = 100)
{
 # graphsheet(pages = "Off")

 # Init: 
 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")

 # First loop:
 for(j in 1:trials) {
  plot(xpoints, ypoints, type = "n", xlab = "", ylab = "", axes = F,
main =
       "Galton's Quincunx")
  cat("")
  points(x = xy[, 1], y = xy[, 2], pch = 5, col = 1)
  cat("")
  marble.path <- sample(HT, 25, replace = T)
  xpos <- 13
  points(xpos, ypos[25], pch = 16, col = 8)
  cat("")
  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)
   cat("")
  }
  xheights[xpos] <- xheights[xpos] + 1
  text(x = xpoints[xx], y = yy[xx], labels = as.character(xheights)[xx])
  cat("")
  plot(xpoints[xx], xheights[xx], ylim = c(0, trials/2), type = "h",
main =
       paste("Trials = ", j, sep = ""), ylab = "Frequency",
   xlab = "X")
  cat("")
  # guiLocator(-1) 
  cat("")
 }
}

Note all the dummy cat("") calls, after calls to functions producing
graphical output. (thats the trick Guido M. told me) It is still not
perfect, but at least works. 

Kjetil Halvorsen


Niels Waller wrote:
> 
> 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
> latest version for Windows).
> 
> 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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