Hello,

The following is the general idea.

x <-c(0.25,0.5,1,2,4,8,16,32)
y <-c(1,1,1,1,0.9,0.8,0.6,0.2)

plot(log(x),y,type="b", xaxt = "n")
axis(1, at = log(x), labels = x)

If the x values are not so "neat", you can adjust the axis ticks and 
labels using round/seq.

Hope this helps,

Rui Barradas

Em 30-08-2012 11:12, Andras Farkas escreveu:
> dear All
>   
> I am trying to plot the following with the x axis on the log scale, but I would like the original x values to show up as labels:
>   
> x <-c(0.25,0.5,1,2,4,8,16,32)
> y <-c(1,1,1,1,0.9,0.8,0.6,0.2)
>   
> plot(log(x),y,type="b")
>   
> here I would like the labels 0.25,0.5,1,2,4,8,16, and 32 to show on the plot at their respective "log scale" location
>   
> apreciate the help,
>   
>   
> Andras
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>
>
>
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