Thanks Jim,

This sprintf function was exactly what I was looking for.

jim holtman a écrit :
> Here is a way that you can put the formatting that you want; you were
> not clear on exactly what you were after.  You can setup the 'labels'
> argument for whatever you want.
>
> a<-1:10
> myTicks<-c(0.1,1,2,5,10)
> # set ylim to range of myTicks that you want
> plot(x=a,y=a,log="y",type="p",yaxt="n", ylim=range(myTicks))
> # change the sprintf to whatever formatting you want
> axis(side=2,at=myTicks,
>     labels=ifelse(myTicks >= 1, sprintf("%.0f", myTicks),
> sprintf("%0.1f", myTicks)))
>
>
>
>
>
> On 8/12/07, Sébastien <pomchip@free.fr> wrote:
>   
>> Dear R-users,
>>
>> Basically, everything is in the title of my e-mail. I know that some
>> threads from the archives have already addressed this question but they
>> did not really give a clear solution.
>> Here is a series of short codes that will illustrate the problem:
>>
>> # First
>> a<-1:10
>> plot(x=a,y=a,log="y",type="p")
>>
>> # Second
>> a<-1:10
>> myTicks<-c(1,2,5,10)
>> plot(x=a,y=a,log="y",type="p",yaxt="n")
>> axis(side=2,at=myTicks)
>>
>> # Third
>> a<-1:10
>> myTicks<-c(0.1,1,2,5,10)
>> plot(x=a,y=a,log="y",type="p",yaxt="n")
>> axis(side=2,at=myTicks)
>>
>> # Forth
>> a<-0.1:10
>> plot(x=a,y=a,log="y",type="p")
>>
>> In the first and second examples, the plots are identical and the tick
>> labels are 1, 2, 5 and 10. In the third, the labels are number in the
>> x.0 format (1.0, 2.0, 5.0 and 10.0), even if there is no point below 1.
>> The only reason I see is because the first element of myTicks is 0.1.
>> And, the forth example is self-explanatory.
>> Interestingly, the 'scales' argument of xyplot in the lattice package do
>> not add these (unnecessary) decimals on labels greater than 1.
>>
>> Do you know how I could transpose the behavior of the lattice 'scales'
>> argument to the 'axis' function ?
>>
>> Thank you
>>
>> PS: No offense, but please don't suggest I use lattice. I have to go for
>> base R graphics in my full-scale project (it is a speed issue).
>>
>> ______________________________________________
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>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>     
>
>
>   

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