Dear expeRts,
I would like to create a scatter plot matrix with splom(). The lower panel
should
contain some additional information about the samples shown in the upper panel
plot, see the splom() call below. Now two questions came up:
(1) The lower panels show "tau" and "alpha" on top of each other. How can I
plot
*three* expressions on top of each other? I tried several approaches (see the
trials below),
but couldn't manage to get this to work properly.
(2) Is there the possibility to plot the two/three lines (containing "tau =
..", "alpha = ..")
aligend according to the equality sign?
Cheers,
Marius
library(lattice)
f <- function(i,j) i+j
U <- matrix(runif(3000), ncol=3)
splom(U,
superpanel=function(z, ...){
tau <- cor(U, method="kendall")
df=data.frame(rows=as.vector(row(tau)), columns=as.vector(col(tau)),
vals=as.vector(tau)) # data frame of row indices, column indices, and
tau values
df=subset(df,columns<rows) # subset for lower left triangle
with(df,{
panel.text(x=rows, y=columns,
labels=as.expression(unlist(lapply(1:length(vals),
function(i)
substitute(atop(tau==tau.,alpha==alpha.),
list(tau.=vals[i],
alpha.=round(vals[i],3)) ) ))) )
})
panel.pairs(z, upper.panel=panel.splom, lower.panel=function(...){},
...)
})
## some minimal "trial" examples:
plot(0,0,main=paste("alpha=1","\n","beta=2","\n","gamma=3",sep=""))
plot(0,0,main=expression(atop(atop(alpha==1, beta==2), gamma==3)))
plot(0,0,main=paste(expression(alpha==1),"\n",expression(beta==2),"\n",
expression(gamma==3), sep=""))
plot(0,0,main=substitute(paste(alpha==1,x,beta==2,x,
gamma==3, sep=""), list(x="\n")))
plot(0,0,main=expression(cat(alpha==1, "\n", beta==2, "\n", gamma==3, sep="")))
plot(0,0,main=cat(expression(alpha==1), "\n", expression(beta==2), "\n",
expression(gamma==3), sep=""))
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