Example on how to manipulate axis values in R

plots.R

# Fake data
y<- sample(10, 100, rep=T)
x <- rnorm(100)

# plots
par(mfrow=c(2,3)) # open an object
plot(x,y) # First plot
title("Default plot")

plot(x,y, axes = FALSE) # Second plot
title("Without any axis")

plot(x,y, axes = FALSE) # Third plot
axis(1)
title("X-axis added, but as is")

plot(x,y, axes = FALSE) # Fourth plot
axis(2)
title("Y-axis added, but as is")

yticks <- seq(5, 12, 1)
plot(x,y, axes = FALSE) # Fifth plot
axis(2, at = yticks, labels = yticks, col.axis="red", las=2)
title("Manipulated Y-axis")

xticks <- seq(0, 3, .5)
plot(x,y, axes = FALSE) # Sixth plot
axis(2, at = yticks, labels = yticks, col.axis="red", las=2)
axis(1, at = xticks, labels = xticks, col.axis="blue", las=2, tck=-.01)
title("Manipulated Y and X axes")