[R] barplot() options for intervals on axes

[Sebastien Moretti]

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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Sebastien MORETTI
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