Add error bars to show standard deviation on a plot in R

Question

For each X-value I calculated the average Y-value and the standard deviation (sd) of each Y-value

x  = 1:5
y  = c(1.1,         


        

Answer 1

You can use arrows:

arrows(x,y-sd,x,y+sd, code=3, length=0.02, angle = 90)