Partial Scatterplot matrix

TEXT 35

Guest on 15th March 2023 02:28:33 AM

## The partial scatterplot matrix defined in section 4.3.3
"partial"<-function(x=matrix(rnorm(120),20,6),...){
# For testing purposes only (set to F if you don't need "2 vs. 1" labels):
showlabels <- F
# Make sure x is in matrix form
x <- as.matrix(x)
n <- ncol(x)
# Make sure we clean up our mess (revert back to original "par" parameters)
# when we're done
oldpar <- par("pty", "oma", "mar", "cex", "tck",
"mgp", "mex", "mfrow")
on.exit({par(oldpar)})
# Set layout, size and margin parameters
# make plots square
par(pty="s")
# determine new optimal plotting character size
CEX <- par("cex") * max(7.7/(2*(n-1)+3), 0.6)*0.5
# specify grid of (n-1) by (n-1) plots
par(mfcol = c(n-1,n-1))
# magically cause plots to pack together nicely
par(oma = rep(3,4))
par(mar = rep(0.3,4))
dif <- diff(par("fin"))/2
if(dif > 0)
par(omi = c(dif*(n-1), 0, dif*(n-1), 0) + par("omi"))
else
par(omi = c(0, (-dif)*(n-1), 0, (-dif)*(n-1)) + par("omi"))
# re-specify plotting character size (since par(mfrow) screwed it up)
par(cex = CEX)
# specify the points type
par(pch=16)
dat <- x
m <- n-1
mat.x <- NULL
mat.y <- NULL
for (k in (1:m)){
fres <- sapply(1:(m+1-k), function(i) residuals(lm(dat[,i] ~ dat[,-c(i,i+k)])))
bres <- sapply(1:(m+1-k), function(i) residuals(lm(dat[,i+k] ~ dat[,-c(i,i+k)])))
mat.x <- cbind(mat.x,fres)
mat.y <- cbind(mat.y,bres)
}
locmat <- matrix(rep(0,m^2),nrow=m)
count <- 0
for (i in (1:m)){
for (j in (1:(m+1-i))){
count <- count+1
locmat[i,j] <- count
}
}
# Make plots (i from top to bottom, j from left to right)
for (i in (2:n)){
for(j in (1:(n-1))){
if (j < i-1){
# prepare an empty plot with correct limits and no axes
plot(range(x[!is.na(x[,j]),j]), range(x[!is.na(x[,i]),i]),
type = "n", axes = F, ...)
# create empty plot and put border around it
box()
# show points for j'th vs. i'th columns of x
points(as.vector(x[,j]),as.vector(x[,i]), ...)
# show which variables are being plotted
if (showlabels)
text(mean(range(x[!is.na(x[,j]),j])),
mean(range(x[!is.na(x[,i]),i])),
paste(j,"vs.",i),cex=1.5*CEX)
}
else{
# Get the information of which variables to be plotted against each other on this grid
loc <- locmat[j-i+2,i-1]
# prepare an empty plot with correct limits and no axes
plot(range(mat.x[!is.na(mat.x[,loc]),loc]), range(mat.y[!is.na(mat.y[,loc]),loc]),
type = "n", axes = F, ...)
# create empty plot and put border around it
box()
# show points for j'th vs. i'th columns of x
points(as.vector(mat.x[,loc]),as.vector(mat.y[,loc]), ...)
}
}
}
}

Raw Paste

## The partial scatterplot matrix defined in section 4.3.3

"partial"<-function(x=matrix(rnorm(120),20,6),...){

# For testing purposes only (set to F if you don't need "2 vs. 1" labels):
  showlabels <- F

# Make sure x is in matrix form
  x <- as.matrix(x)
  n <- ncol(x)

# Make sure we clean up our mess (revert back to original "par" parameters)
# when we're done
  oldpar <- par("pty", "oma", "mar", "cex", "tck",
    "mgp", "mex", "mfrow")
  on.exit({par(oldpar)})

# Set layout, size and margin parameters
  # make plots square
  par(pty="s")
  # determine new optimal plotting character size
  CEX <- par("cex") * max(7.7/(2*(n-1)+3), 0.6)*0.5
  # specify grid of (n-1) by (n-1) plots
  par(mfcol = c(n-1,n-1))
  # magically cause plots to pack together nicely
  par(oma = rep(3,4))
  par(mar = rep(0.3,4))
  dif <- diff(par("fin"))/2
  if(dif > 0)
    par(omi = c(dif*(n-1), 0, dif*(n-1), 0) + par("omi"))
  else
    par(omi = c(0, (-dif)*(n-1), 0, (-dif)*(n-1)) + par("omi"))
  # re-specify plotting character size (since par(mfrow) screwed it up)
  par(cex = CEX)
  # specify the points type
  par(pch=16)

dat <- x
  m <- n-1
  mat.x <- NULL
  mat.y <- NULL

for (k in (1:m)){
   fres <- sapply(1:(m+1-k), function(i) residuals(lm(dat[,i] ~ dat[,-c(i,i+k)])))
   bres <- sapply(1:(m+1-k), function(i) residuals(lm(dat[,i+k] ~ dat[,-c(i,i+k)])))
   mat.x <- cbind(mat.x,fres)
   mat.y <- cbind(mat.y,bres)
  }

locmat <- matrix(rep(0,m^2),nrow=m)
  count <- 0
  for (i in (1:m)){
    for (j in (1:(m+1-i))){
        count <- count+1
        locmat[i,j] <- count
    }
  }

# Make plots (i from top to bottom, j from left to right)
  for (i in (2:n)){
    for(j in (1:(n-1))){
      if (j < i-1){
        # prepare an empty plot with correct limits and no axes
        plot(range(x[!is.na(x[,j]),j]), range(x[!is.na(x[,i]),i]),
           type = "n", axes = F, ...)
        # create empty plot and put border around it
        box()
        # show points for j'th vs. i'th columns of x
        points(as.vector(x[,j]),as.vector(x[,i]), ...)
        # show which variables are being plotted
        if (showlabels)
        text(mean(range(x[!is.na(x[,j]),j])),
        mean(range(x[!is.na(x[,i]),i])),
        paste(j,"vs.",i),cex=1.5*CEX)
      }
      else{
        # Get the information of which variables to be plotted against each other on this grid
        loc <- locmat[j-i+2,i-1] 
	# prepare an empty plot with correct limits and no axes
	plot(range(mat.x[!is.na(mat.x[,loc]),loc]), range(mat.y[!is.na(mat.y[,loc]),loc]),
	   type = "n", axes = F, ...)
        # create empty plot and put border around it
        box()
	# show points for j'th vs. i'th columns of x
        points(as.vector(mat.x[,loc]),as.vector(mat.y[,loc]), ...)

}
    }
  }
}