[R] subsetting, aggregating and zoo

[antonio rodriguez]

Dear Gabor,

Many thanks!!  

Best regards,

Antonio



Gabor Grothendieck escribió:
> aggregate can also be used:
>
>   aggregate(d, list(d = d), length) # output is data frame
>
> or using zoo:
>
>   library(zoo)
>   aggregate(zoo(as.vector(d)), d, length) # output is a zoo object
>
> If what you actually have is a zoo object such as this one:
>
>   z <- zoo(1:10, d)
>
> then the last statement could be written
>
>   aggregate(z, time(z), length)
>
> Note that z has non-unique times so strictly speaking z is an illegal
> zoo object.although at least currently such objects can be constructed
> by zoo or read.zoo and operated on by aggregate.zoo though most
> other zoo operations will not accept them.
>
> On 11/2/06, antonio rodriguez <antonio.raju at gmail.com> wrote:
>> Brandt, T. (Tobias) escribió:
>> >
>> > I think the following does what you want:
>> >
>> > > (d <- structure(c(6586, 6586, 6589, 6593, 6593, 6593, 6598, 6598,
>> > 6598, 6598), class = "Date"))
>> >  [1] "1988-01-13" "1988-01-13" "1988-01-16" "1988-01-20" "1988-01-20"
>> > "1988-01-20" "1988-01-25"
>> >  [8] "1988-01-25" "1988-01-25" "1988-01-25"
>> > > (td <- table(d))
>> >
>> Dear Tobias,
>>
>> Yes it does!! And it's enough with the last sentence: td<-table(d)
>>
>> since the following outputs (don't know why, probably because I'm
>> working with a zoo object?):
>>
>> names(td) <- as.Date(as.numeric(names(td)))  # to make the names more
>> readable
>> Warning message:
>> NAs introducidos por coerción
>>  > print(td)
>> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA> <NA>
>> <NA> <NA>
>>   2    1    3    6    5    4    3    4    3    1    1    1   10    1
>> 1    2
>>
>> Thanks a lot!
>>
>> Antonio
>>
>>
>> > d
>> > 6586 6589 6593 6598
>> >    2    1    3    4
>> > > names(td) <- as.Date(as.numeric(names(td)))  # to make the names
>> > more readable
>> > > print(td)
>> > 1988-01-13 1988-01-16 1988-01-20 1988-01-25
>> >          2          1          3          4
>> > >
>> >
>> > HTH,
>> >
>> > Tobias
>> >
>>
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>