[R] plotting date data over couple of months

[vamshi999]

Hi .. i am a beginner in R 

I have data in the format of 

date
04/27/11
04/27/11
04/30/11
04/30/11
05/03/11
05/03/11
05/04/11....

Now i want to plot the data something like this on x-axis... 
     
             ------------------
               27 28 29 30 1 2 3 4 
               April             May
I also wanted to know how to place a "*" when a date is missing from the
data.. 

my other question is plotting the error bars.. since you can see that i have
dates repeating. how to plot the error bars for count number of dates
detected... 

I would appreciate if someone could answer as soon as possible... 

thank you in advance.. 

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