[R] Plotting question: Problem with strwidth in 2.7.1

[Lauri Nikkinen]

R users,

I have a problem with function strwidth in 2.7.1. I'm trying to set
the plot margins in a way that horizontal
column labels will fit to the graph. tmp.t is a list of data.frame
objects. This code works well in 2.6.0.

...snip..
library(gplots)
for (i in names(tmp.t)) {
          bmp(filename=paste(i, "_", Sys.Date(), ".bmp", sep=""),
width=1038, height=820, res=1200)
          maxim <- max(strwidth(as.character(colnames(tmp.t[[i]])),
units="inches"))*4.5
          opar <- par(mar=c(3,maxim,2,2), bg="white", cex=1.6, oma =
c(0, 0, 2, 0), mgp=c(3,0.5,0), xpd=TRUE)
          colo <- c("red", "lightblue1", "orange", "yellow")
          xmax <- max(unlist(lapply(tmp.t[i], function(x) apply(x, 2,
sum))) + 15)
          bar <- barplot2(tmp.t[[i]],
                  horiz=TRUE,
                  names.arg=as.character(colnames(tmp.t[[i]])),
                  las=1,
                  cex.names=0.7,
                  cex.main=0.9,
                  cex.axis=0.7,
                  xlim=c(0, xmax),
                  col=colo,
                  plot.grid = TRUE
                  )
          box()
          dev.off()
          }
...snip...

Now running this script I get an error message

Error in plot.new() : figure margins too large

I found from http://cran.r-project.org/src/base/NEWS that

    o	Use of strwidth/height(units="user") (the default) is again an
	error before a user coordinate system has been set on the
	device, rather than giving nonsensical values (the effect of
	r31367).

Does this have something to do with my problem? How should I modify my
code to get it work in R 2.7.1?

Thanks
Lauri

> sessionInfo()
R version 2.7.1 (2008-06-23)
i386-pc-mingw32

locale:
LC_COLLATE=Finnish_Finland.1252;LC_CTYPE=Finnish_Finland.1252;LC_MONETARY=Finnish_Finland.1252;LC_NUMERIC=C;LC_TIME=Finnish_Finland.1252

attached base packages:
[1] tcltk     stats     graphics  grDevices utils     datasets  methods
[8] base

other attached packages:
[1] TeachingDemos_2.2 tkrplot_0.0-18    gplots_2.6.0      gdata_2.4.2
[5] gtools_2.5.0      RODBC_1.2-3

loaded via a namespace (and not attached):
[1] tools_2.7.1