How to add a line in a plot in R

user_8442467 0
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I want to add a solid/dotted line in a plot in R, from the South-West corner to the North-East corner (corner to corner). If use the following code, my line does not go from corner to corner. 

x.axis<-c(1.11, 0.67, 0.33, 0.33, 1.22, 0.67, 1.44, 2.67, 7.00, 5.00, 6.44, 2.78, 67.50, 65.40, 65.20, 68.00, 64.80, 62.40)
x.axis
y.axis<-c(26.056351,13.077900,8.882701,12.155014,20.150054,8.516783,6.185070,19.464096,17.700288,14.130253,5.778807,22.429427,
          52.611215, 8.286860,  36.316078,  62.010992,  82.822043,  41.747899)
y.axis
plot(x.axis,y.axis)
abline(a=0,b=1)

Does anyone know if it is possible to add such line?

plot r
1 Answers

If want to plot a line from corner to corner of the plot, you will have to specify the points based on the x and y limits of the plot window itself. You can call these using par('usr'). 

# make the plot
plot(x.axis, y.axis)
# get axis limits
al = par("usr")
# plot a point to point line based on the axis limits
segments(al[1], al[3], al[2], al[4], col='pink')

corner to corner plot

user_61017130
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