[R] Reshape from long to wide format with date variable

[Pete Pete]

Hi,

I need to reshape my dataframe from a long format to a wide format.
Unfortunately, I have a continuous date variable which gives me headaches.

Consider the following example:
> id=c("034","034","016","016","016","340","340")
> date=as.Date(c("1997-09-28", "1997-10-06", "1997-11-04", "2000-09-27",
> "2003-07-20", "1997-11-08", "1997-11-08"))
> ref=c("2","2","1","1","2","1","1")
> data1=data.frame(id,date,ref)
> data1
   id       date ref
1 034 1997-09-28   2
2 034 1997-10-06   2
3 016 1997-11-04   1
4 016 2000-09-27   1
5 016 2003-07-20   2
6 340 1997-11-08   1
7 340 1997-11-08   1


I would like to have it like this:
> data2
   id      date1      date2      date3 ref1 ref2 ref3
1 034 1997-09-28 1997-10-06         NA    2    2   NA
2 016 1997-11-04 2000-09-27 2003-07-20    1    1    2
3 340 1997-11-08 1997-11-08         NA    1    1   NA

All I tried the reshape package but ended up in multiple variables for each
of the dates and that is not what I would like to have.

Thanks for you help.

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