add text to horizontal barplot in R, y-axis at different scale?

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By chacking the documentation of barplot, you can see that it has an invisible return value: the midpoints of the bars. You can use those to add additional information to the plot.

x <- runif(10, 0,1) 
y <- matrix(c(x, 1-x), nrow=2, ncol=10, byrow=TRUE) 
bp <- barplot(y, horiz=TRUE, beside=FALSE, names.arg=seq(1,10,1), las=1, 
              xlim=c(0, 1.2)) 
text(x, bp, signif(x,2), pos=4)
bp

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