[R] grid.table + splom: how to nicely align panel entries

[baptiste auguie]

On 20 April 2011 21:16, Marius Hofert <m_hofert at web.de> wrote:
> Dear expeRts,
>
> is there a way to get the entries in each panel correctly aligned according to the
> equality signs?
>
> Here is the "wish-list":
> (1) the equality signs in each panel should be vertically aligned

You can put the equal signs in their own column,

library(gridExtra)
d = matrix(c("italic(a)", "phantom()==phantom()", round(pi,4),
"italic(b)", "phantom()==phantom()", round(pi,6)), ncol=3, byrow=T)
grid.table(d, parse=T,theme=theme.list(core.just="left"))

> (2) the numbers should be aligned on the decimal point

You could place some phantom()s to do this,

align.digits = function(l)
{

sp <- strsplit(as.character(l), "\\.")
chars <- sapply(sp, function(x) nchar(x)[1])
n = max(chars) - chars
l0 = sapply(n, function(x) paste(rep("0", x), collapse=""))
labels = sapply(seq_along(sp), function(i) {
  as.expression(bquote(phantom(.(l0[i])) * .(sp[[i]][1])*.*.(sp[[i]][2])))})

return(labels)
}

library(gridExtra)

d <- align.digits(l = c(125.3, 1.23444444))
grid.table(d, parse=T,core.just="left")

HTH,

baptiste

> One could adjust the phantom()-arguments by hand to achieve (1), but is there a
> simpler solution? For (2) I have no idea.
>
> Cheers,
>
> Marius
>
>
> library(lattice)
> library(grid)
> library(gridExtra)
>
> ## splom with customized lower.panel
> ## x: data
> ## arr: array of containing expressions which are plotted in a grid table in the
> ##      lower panel (i,j)]
> splom2 <- function(x, arr){
>    ## function for creating table
>    table.fun <- function(vec){ # vector containing lines for table for *one* panel
>        grid.table(matrix(vec, ncol=2, byrow=TRUE),
>                   parse=TRUE, # parse labels as expressions
>                   theme=theme.list(
>                   gpar.corefill=gpar(fill=NA, col=NA), # make bg transparent
>                   core.just="left", padding.h=unit(0,"mm")) # justification of labels
>                   )
>    }
>    ## splom
>    splom(x, varname.cex=1.4,
>          superpanel=function(z, ...){
>              panel.pairs(z, upper.panel=panel.splom, lower.panel=function(i,j){
>                  table.fun(arr[i,j,])
>              }, ...)
>          })
> }
>
> ## create data and array of expressions
> d <- 4
> x <- matrix(runif(d*1000), ncol=d) # data to be plotted with splom
> arr <- array(list(rep(NA, 3*2)), dim=c(d,d,3*2), dimnames=c("i","j","val")) # array containing the table entries per panel
> f <- function(i,j) (i+j)*10+0.1 # dummy function
> for(i in 1:d){
>    for(j in 1:d){
>        arr[i,j,] <- c("alpha==phantom()", round(pi,4),
>                       "italic(bbb)==phantom()", round(pi,6),
>                       "gamma==phantom()", f(i,j))
>    }
> }
>
> ## plot
> splom2(x, arr)
>
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