[R] Find missing days

[Lauri.Nikkinen at veripalvelu.fi]

Thanks Gabor for your reply. Your script will find missing days in date1
range but my intention was to find missing days in each level (df$lev)
in corresponding month. The resulting df could look like this:

    lev      date1
1  lev1 2007-09-03
2  lev1 2007-09-04
4  lev1 2007-09-24
5  lev1 2007-09-25
6  lev1 2007-09-26
7  lev1 2007-09-27
8  lev1 2007-09-28
9  lev1 2007-09-29
10 lev1 2007-09-30
11 lev2 2007-09-01
12 lev2 2007-09-02
13 lev2 2007-09-03
14 lev2 2007-09-04
15 lev2 2007-09-05
16 lev2 2007-09-06
17 lev2 2007-09-07
18 lev2 2007-09-08
19 lev2 2007-09-09
20 lev2 2007-09-10
21 lev2 2007-09-11
22 lev2 2007-09-12
23 lev2 2007-09-13
24 lev2 2007-09-14
25 lev2 2007-09-15
26 lev2 2007-09-16
27 lev2 2007-09-17
28 lev2 2007-09-18
29 lev2 2007-09-19
30 lev2 2007-09-20
31 lev2 2007-09-21
32 lev2 2007-09-22
33 lev2 2007-09-23
34 lev2 2007-10-17
35 lev2 2007-10-18
36 lev2 2007-10-19
37 lev2 2007-10-20
38 lev2 2007-10-21
39 lev2 2007-10-22
20 lev2 2007-10-23
41 lev2 2007-10-24
42 lev2 2007-10-25
43 lev2 2007-10-26
44 lev2 2007-10-27
45 lev2 2007-10-28
46 lev2 2007-10-29
47 lev2 2007-10-20
48 lev2 2007-10-31
49 lev3 2007-10-01
etc.

Thanks again,
Lauri

-----Original Message-----
From: Gabor Grothendieck [mailto:ggrothendieck at gmail.com] 
Sent: 2. tammikuuta 2008 9:22
To: Nikkinen Lauri
Cc: r-help at stat.math.ethz.ch
Subject: Re: [R] Find missing days

Try this.  It creates a sequence of dates from the range of df$date1 and
then does a setdiff between that and the original dates.  The result is
numeric so we create a Date structure out of it.

structure(setdiff(do.call(seq, as.list(range(df$date1))), df$date1),
class = "Date")


On Jan 2, 2008 1:55 AM,  <Lauri.Nikkinen at veripalvelu.fi> wrote:
> Hi,
>
> I have a data.frame like this:
>
> y <- rnorm(60)
> lev <- gl(3,20, labels=paste("lev", 1:3, sep=""))
> date1 <- as.Date(seq(ISOdate(2007,9,1), ISOdate(2007,11,5),
> by=60*60*24))
> date1 <- date1[-c(3,4,15,34,38,40)]
> df <- data.frame(lev=lev, date1=date1, y=y)
>
> I would like to produce a new data.frame with missing days in df$date1
> in each df$lev, like this:
>
>    lev      date1
> 1  lev1 2007-09-03
> 2  lev1 2007-09-04
> 3  lev1 2007-09-15
> 4  lev2 2007-09-01
> 5  lev2 2007-09-02
> etc.
>
> How can I do this?
>
> Thanks,
> Lauri
> FRCBS
>
>
>
>        [[alternative HTML version deleted]]
>
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