Re: [R] R-level expansion of Rplot%03d.png

[kees duineveld]

You are correct. (I really should start using these reading glasses).
My apologies

On Sat, 21 Aug 2010 14:20:17 +0200, baptiste auguie  
<baptiste.aug...@googlemail.com> wrote:

I dunno, it doesn't seem to do it for me,

name = "Rplot%03d.png"
real.name = path.expand(name)
real.name
#[1] "Rplot%03d.png"
list.files(patt=".png")
#[1] "Rplot001.png"

sessionInfo()
R version 2.11.1 (2010-05-31)
i386-apple-darwin9.8.0

locale:
[1] en_GB.UTF-8/en_GB.UTF-8/C/C/en_GB.UTF-8/en_GB.UTF-8

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



On 21 August 2010 14:15, kees duineveld <kees.duinev...@gmail.com> wrote:
Now I understand. You need the name which png() does not return.
So I think you need to do (untested, I am struggling with the cat()):


makePlot = function(p, name="Rplot%03d", width=300)
{
real.name.png = path.expand(paste(name,'.png'sep='') # function needed  
here
real.name.pdf = path.expand(paste(name,'.pdf'sep='') # function needed  
here
png(real.name.png)
print(p)
dev.off()
pdf(real.name.pdf)
print(p)
dev.off()
cat(noquote(paste('image:',real.name.png,',width=',width,',link=real.name.pdf)
}

On Sat, 21 Aug 2010 14:02:04 +0200, baptiste auguie
<baptiste.aug...@googlemail.com> wrote:

My function needs to do two things with the filename:

First, create the plot file. For this, Rplot%03d is OK because it is
correctly interpreted by the graphics device.

Second, generate a text string referring to this filename. This is
where I need to convert Rplot%03d to, say, Rplot001. I am assuming
that it is implemented internally by looking at the files in the
current directory with some regular expression search, and
incrementing the end number as needed. I wonder if there's a high
level function to perform this task.

Best,

baptiste

On 21 August 2010 13:35, kees duineveld <kees.duinev...@gmail.com>  
wrote:

Not sure what you want. Plot does that automatically. It seems to use
path.expand() to make the %03d expansion. Not that path.expand() is
documented to do this, but it seem to work.

Kees

On Sat, 21 Aug 2010 13:04:54 +0200, baptiste auguie
<baptiste.aug...@googlemail.com> wrote:

Dear list,

I'm using the brew package to generate a report containing various
plots. I wrote a function that creates a plot in png and pdf formats,
and outputs a suitable text string to insert the file in the final
document using the asciidoc syntax,

<%
tmp <- 1
makePlot = function(p, name=paste("tmp",tmp,sep=""), width=300)
{
png(paste(name,".png",sep=""))
print(p)
dev.off()
pdf(paste(name,".pdf",sep=""))
print(p)
dev.off()


cat(noquote(paste('image:',name,'.png["',name,'",width=',width,',link="',name,'.pdf"]',sep="")))
tmp <<- tmp + 1
}
%>

The resulting html file contains a thumbnail of the png file, with a
link to the pdf file.

I'm not happy with my default filename for the graphics. Is there a
way to expand the default filename of R graphic devices? I would like
to call it like this,


makePlot = function(p, name="Rplot%03d", width=300)
{

real.name = expandName(name) # function needed here
png(paste(name,".png",sep=""))
print(p)
dev.off()
pdf(paste(name,".pdf",sep=""))
print(p)
dev.off()


cat(noquote(paste('image:',real.name,'.png["',real.name,'",width=',width,',link="',real.name,'.pdf"]',sep="")))
}


Sincerely,

baptiste

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