Placing the grid along date tickmarks

Question

I have the following data:

x=strptime(20010101:20010110)
y=1:10
z=data.frame(x,y)

So my data is this:

            x  y
1  2         


        

Answer 1

I'm not familiar with the intricacies of the base plots. But, ggplot does this effectively.

x <- strptime(20010101:20010110, format='%Y%m%d')
y <- 1:10
z <- data.frame(x, y)
qplot(x,y,data=z,'point')