Hi Baptiste,
Thank for the help. One thing though that I found while transposing your
syntax to my problem: lab must be of class expression for your syntax to
work. For instance, if one replaces the second elements of the lab
variables by a simple integer, lab is not more of class expression, and
grid.text just displays strings of character.
An easy way to bullet proof the code: use as.expression when building lab
Thanks
baptiste auguie wrote:
Hi,
Try this,
library(grid)
value <- c(0.1)
lab <- c("test",
expression(bquote(paste(.(value[1]*100), " and percentiles1",
sep=""))),
bquote(expression(.(value[1]*100)*" and percentiles2")),
bquote(paste(.(value[1]*100), " and percentiles3", sep="")) )
grid.newpage()
grid.text(eval(lab[1]), x=0.5, y=unit(1,"npc")-unit(1,"lines"))
grid.text(eval(lab[2]), x=0.5, y=unit(1,"npc")-unit(2,"lines"))
grid.text(eval(lab[3]), x=0.5, y=unit(1,"npc")-unit(3,"lines"))
grid.text(lab[4], x=0.5, y=unit(1,"npc")-unit(4,"lines"))
My preference goes for the last one.
HTH,
baptiste
2009/9/2 Sebastien Bihorel <sebastien.biho...@cognigencorp.com
<mailto:sebastien.biho...@cognigencorp.com>>
Dear R-users,
I am trying to use the grid.text and expression functions to
display several character strings and plotmath text on a viewport.
Some strings can include a variable portion (PI.limits in the
following example), which I thought could be implemented by
combining the bquote and the expression functions. Unfortunately,
my expressions do not seem to be evaluated. I would greatly
appreciate if somebody could tell me where my mistake(s) is(are).
Thank you in advance
###### 8< #######
library(grid)
PI.limits <- c(0.1,0.9)
vp.ref <- c("raw data","median","median",
bquote(expression(paste(.(PI.limits[1]*100), " and ",
.(PI.limits[2]*100)^th,"
percentiles", sep=""))),
bquote(expression(paste(95^th,"confidence interval
on percentiles", sep=" "))),
bquote(expression(paste(95^th,"confidence interval
on percentiles", sep=" ")))
)
grid.newpage()
for (i in c(1,3,4,5,6)) {
grid.text(eval(vp.ref[i]), x=0.5, y=unit(1,"npc")-unit(i,"lines"))
}
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--
_____________________________
Baptiste Auguié
School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK
http://newton.ex.ac.uk/research/emag
______________________________
______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
