Thanks Tony (and others). Setting oma corrects the problem. Mark
Mark W. Kimpel MD  ** Neuroinformatics ** Dept. of Psychiatry
Indiana University School of Medicine

15032 Hunter Court, Westfield, IN  46074

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On Mon, Oct 12, 2009 at 1:41 PM, Tony Plate <tplate@acm.org> wrote:

> Try playing around with the "oma" setting in par() -- it sets the outer
> margins, which by default are zero.
>
> The following shows the mtext label for me, using the windows device:
>
>  par(mfrow=c(2,2))
>> par("oma")
>>
> [1] 0 0 0 0
>
>> par("oma"=c(0,0,2,0))
>> for (i in 1:4) plot(0:1,0:1)
>> mtext(text = "my test plots", side = 3, outer = TRUE)
>>
>>
> Mark Kimpel wrote:
>
>> I'm trying to use mtext to create a main title over multiple plots. Below
>> is
>> a simple self-contained example and my sessionInfo (I should note I've
>> also
>> tried this with R-2.8.1 with the same results). When I execute the code
>> chunk below, I get the plots, but no title. I've tried this using the
>> screen
>> driver, pdf, and postscript. I've used different sizes of paper. I suspect
>> I
>> am making an elementary error but searching the help files and help
>> archives
>> hasn't provided me an answer.
>>
>> Thanks for any help, Mark
>>
>> #############################################
>> setwd("~/Desktop")
>> pdf("my.test.plots.pdf", paper = "letter")
>> par(mfrow=c(2,2))
>> for (i in 1:4){
>>  plot(1:6, 1:6)
>> }
>> mtext(text = "my test plots", side = 3, outer = TRUE)
>> dev.off()
>> #
>>
>> R version 2.10.0 Under development (unstable) (2009-09-21 r49771)
>> x86_64-unknown-linux-gnu
>>
>> locale:
>>  [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
>>  [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
>>  [5] LC_MONETARY=C              LC_MESSAGES=en_US.UTF-8
>>  [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
>>  [9] LC_ADDRESS=C               LC_TELEPHONE=C
>> [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
>>
>> attached base packages:
>> [1] stats     graphics  grDevices utils     datasets  methods   base
>>
>> other attached packages:
>> [1] car_1.2-15
>>
>> loaded via a namespace (and not attached):
>> [1] tools_2.10.0
>>
>> Mark W. Kimpel MD  ** Neuroinformatics ** Dept. of Psychiatry
>> Indiana University School of Medicine
>>
>> 15032 Hunter Court, Westfield, IN  46074
>>
>> (317) 490-5129 Work, & Mobile & VoiceMail
>> (317) 399-1219 Skype No Voicemail please
>>
>>        [[alternative HTML version deleted]]
>>
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>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
>

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