[R] Creating a dummy variable

[arunkumar1111]

HI

I want to create a dummy variable for a dataset which has various dates Eg
I've one year data. The user can choose any date range

startdate : 2012-01-01
enddate: 2012-02-01

startdate: 2012-06-01
enddate=2012-07-01

the columns of dataset= X ,Y ,date
       

Thanks and re

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Thanks in Advance
        Arun
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