I don't see how the data in the three column table you present is enough to
produce the four column test. Should the first table actually show repeated
collar usage so that you can use the next incidence of the collar as the end
date e.g
1 01/01/2013
1 02/04/2013
and so on?
Some actual data might be useful.
The easiest way to supply data is to use the dput() function. Example with
your file named "testfile":
dput(testfile)
Then copy the output and paste into your email. For large data sets, you can
just supply a representative sample. Usually, dput(head(testfile, 100)) will
be sufficient.
Sorry I'm not more helpful
John Kane
Kingston ON Canada
> -----Original Message-----
> From: cat.e.co...@gmail.com
> Sent: Fri, 15 Mar 2013 12:46:13 +0800
> To: r-help@r-project.org
> Subject: [R] Reassign values based on multiple conditions
>
> Hi all,
>
> I have a simple data frame of three columns - one of numbers (really a
> categorical variable), one of dates and one of data.
>
> Imagine:
>
> collar date data
> 1 01/01/2013 x
> 2 02/01/2013 y
> 3 04/01/2013 z
> 4 04/01/2013 a
> 5 07/01/2013 b
>
>
> The 'collar' is a GPS collar that's been worn by an animal for a certain
> amount of time, and then may have been worn by a different animal after
> changes when the batteries needed to be changed. When an animal was
> caught
> and the collar battery needed to be changed, a whole new collar had to be
> put on, as these animals (wild boar and red deer!) were not that easy to
> catch. In order to follow the movements of each animal I now need to
> create
> a new column that assigns the 'data' by animal rather than by collar. I
> have a table of dates, e.g....
>
> animal collar start_date end_date
> 1 1 01/01/2013 03/01/2013
> 1 5 04/01/2013 06/01/2013
> 1 3 07/01/2013 09/01/2013
> 2 2 01/01/2013 03/01/2013
> 2 1 04/01/2013 06/01/2013
>
> I have so far been able to make multi-conditional tests:
>
> animal1test<- (date>=01/01/13 && date<=03/01/13)
> animal1test2<- (date>=04/01/13 && date<=06/01/13)
> animal2test<- (date>=04/01/13 && date<=06/01/13)
>
> to use in an 'if else' formula:
>
> if(animal1test){
> collar[1]="animal1"
> } else if(animal1test2){
> collar[5]="animal1"
> }else if(animal2test)
> collar[1]="animal2"
> }else "NA"
>
> As I'm sure you can see, this is completely inelegant, and also not
> working
> for me! Any ideas on how to a achieve this?
>
> Thanks SO much in advance,
> Cat
>
> [[alternative HTML version deleted]]
>
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