Dear List members,
I wrote some code to split long names in format.ftable. I hope it will
be useful to others as well.
Ideally, this code should be implemented natively in R. I will provide
in the 2nd part of the mail a concept how to actually implement the code
in R. This may be interesting to R-devel as well.
### Helper function
# Split the actual names
split.names = function(names, extend=0, justify="Right", blank.rm=FALSE,
split.ch = "\n", detailed=TRUE) {
justify = if(is.null(justify)) 0 else pmatch(justify, c("Left",
"Right"));
str = strsplit(names, split.ch);
if(blank.rm) str = lapply(str, function(s) s[nchar(s) > 0]);
nr = max(sapply(str, function(s) length(s)));
nch = lapply(str, function(s) max(nchar(s)));
chf = function(nch) paste0(rep(" ", nch), collapse="");
ch0 = sapply(nch, chf);
mx = matrix(rep(ch0, each=nr), nrow=nr, ncol=length(names));
for(nc in seq(length(names))) {
n = length(str[[nc]]);
# Justifying
s = sapply(seq(n), function(nr) paste0(rep(" ", nch[[nc]] -
nchar(str[[nc]][nr])), collapse=""));
s = if(justify == 2) paste0(s, str[[nc]]) else
paste0(str[[nc]], s);
mx[seq(nr + 1 - length(str[[nc]]), nr) , nc] = s;
}
if(extend > 0) {
mx = cbind(mx, matrix("", nr=nr, ncol=extend));
}
if(detailed) attr(mx, "nchar") = unlist(nch);
return(mx);
}
### ftable with name splitting
# - this code should be ideally integrated inside format.ftable;
ftable2 = function(ftbl, print=TRUE, quote=FALSE, ...) {
ftbl2 = format(ftbl, quote=quote, ...);
row.vars = names(attr(ftbl, "row.vars"))
nr = length(row.vars);
nms = split.names(row.vars, extend = ncol(ftbl2) - nr);
ftbl2 = rbind(ftbl2[1,], nms, ftbl2[-c(1,2),]);
# TODO: update width of factor labels;
# - new width available in attr(nms, "nchar");
if(print) {
cat(t(ftbl2), sep = c(rep(" ", ncol(ftbl2) - 1), "\n"))
}
invisible(ftbl2);
}
I have uploaded this code also on Github:
https://github.com/discoleo/R/blob/master/Stat/Tools.Data.R
B.) Detailed Concept
# - I am ignoring any variants;
# - the splitting is actually done in format.ftable;
# - we set only an attribute in ftable;
ftable = function(..., split.ch="\n") {
[...]
attr(ftbl, "split.ch") = split.ch; # set an attribute "split.ch"
return(ftbl);
}
format.ftable(ftbl, ..., split.ch) {
if(is.missing(split.ch)) {
# check if the split.ch attribute is set and use it;
} else {
# use the explicitly provided split.ch: if( ! is.null(split.ch))
}
[...]
}
C.) split.names Function
This function may be useful in other locations as well, particularly to
split names/labels used in axes and legends in various plots. But I do
not have much knowledge of the graphics engine in R.
Sincerely,
Leonard
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
