Hi,

I want to customize the x-axis.

I tried that:
par(bty="n", xaxt="n")
so that the x-axis is supressed.

then I tried to plot two variables and add a customized x-axis:
plot(x, y)
axis(1, at=c(1,2), labels=c("group1", "group2"))

but the axis is not added to the plot.

I don't understand why..
And how then can I customize the axis?
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