Hello, I am a beginner with R. I read many tutorials and the FAQ but I cannot solve my problem. I use barplot() to view my graph. I try to get more interval marks on y axis. I wasn't able to find options in 'help(barplot)' or 'help(par)' to do this with barplot(). I seek for another option to print y values on my bars like on the graph of the R homepage: http://www.r-project.org/ Thanks for your help. -- Sebastien MORETTI Linux User - #327894 CNRS - IGS 31 chemin Joseph Aiguier 13402 Marseille cedex 20, FRANCE tel. +33 (0)4 91 16 44 55
Did you see the lab argument to par()?
'lab' A numerical vector of the form 'c(x, y, len)' which
modifies
the way that axes are annotated. The values of 'x' and
'y'
give the (approximate) number of tickmarks on the x and y
axes and 'len' specifies the label size. The default is
'c(5, 5, 7)'. _Currently_, 'len' _is unimplemented_.
You might want something like this:
par(lab=c(5,10,7))
barplot(runif(10))
Sebastien Moretti wrote:> Hello,
> I am a beginner with R. I read many tutorials and the FAQ but I cannot
solve
> my problem.
> I use barplot() to view my graph. I try to get more interval marks on y
axis.
> I wasn't able to find options in 'help(barplot)' or
'help(par)' to do this
> with barplot().
>
> I seek for another option to print y values on my bars like on the graph of
> the R homepage: http://www.r-project.org/
>
> Thanks for your help.
>
--
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tel: (212) 845-4495 (Tu, Th)
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Sebastien Moretti wrote:> Hello, > I am a beginner with R. I read many tutorials and the FAQ but I cannot solve > my problem. > I use barplot() to view my graph. I try to get more interval marks on y axis. > I wasn't able to find options in 'help(barplot)' or 'help(par)' to do this > with barplot().See ?par and ?axis. You might want to omit the y-axis completely at first (argument yaxt="n") and add one manually useing axis(2, ....).> I seek for another option to print y values on my bars like on the graph of > the R homepage: http://www.r-project.org/Click on the image and see the code how it was generated. Uwe Ligges> Thanks for your help. >
On Mon, 2004-12-06 at 15:30 +0100, Sebastien Moretti wrote:> Hello, > I am a beginner with R. I read many tutorials and the FAQ but I cannot solve > my problem. > I use barplot() to view my graph. I try to get more interval marks on y axis. > I wasn't able to find options in 'help(barplot)' or 'help(par)' to do this > with barplot(). > > I seek for another option to print y values on my bars like on the graph of > the R homepage: http://www.r-project.org/ > > Thanks for your help.The general process of customizing the annotation of the axes for a variety of plots is posted frequently to this e-mail list, so a search of the archive using "axis" as the keyword yields almost 2,000 hits. Using "axis labels" narrows that to 650, which are more relevant. The key is to inhibit the generation of the default y axis by using the argument 'yaxt = "n"': Compare: barplot(1:5) versus barplot(1:5, yaxt = "n") You can then use the axis() function to customize the y axis values: barplot(1:5, yaxt = "n") axis(2, at = seq(0, 5, 0.25), las = 1) help("par") provides additional information on the graphic parameters, which are the key to these types of customizations. See ?axis for more information on that function as well. To your second query, the key is to note that barplot() returns the bar midpoints, which is referenced in the Value section of ?barplot. Thus: mp <- barplot(1:5, yaxt = "n", ylim = c(0, 6)) axis(2, at = seq(0, 5, 0.25), las = 1) text(mp, 1:5, labels = 1:5, pos = 3) See ?text for more information. Also, note that I increased the range of the y axis here to make room for the bar text labels (primarily the final tallest bar). Finally, there is an article in the R Help Desk section of the October 2003 R News on basic graphic operations in R, which you might find helpful. A direct link to it is: http://cran.r-project.org/doc/Rnews/Rnews_2003-2.pdf HTH, Marc Schwartz