[R] subsetting, aggregating and zoo

[antonio rodriguez]

Gabor Grothendieck escribió:
> On 10/28/06, antonio rodriguez <antonio.raju at gmail.com> wrote:
>> Hi,
>>
>> Having an zoo object I can subset it to obtain the days where I have the
>> values within some range:
>>
>> is.zoo(z)
>> TRUE
>>
>> subset(z[,1], z[,1]>=5 & z[,1]<= 10) #Yields: Year(day)
>>
>> 1988(13)  1988(14)  1988(16)  1988(20)  1988(21)  1988(22)  1988(25)
>> 1988(26)
>> 7.973946  9.933518  7.978227  7.512960  6.641862  5.667780  5.721358
>> 6.863729
>> 1988(27)  1988(28)  1988(29)  1988(30)  1988(32)  1988(33)  1988(34)
>> 1988(35)
>>  9.600000  9.049846  9.213438  6.412746  5.543606  7.881596  6.373102
>> 7.220562
>> .................................................................................................................. 
>>
>> .................................................................................................................. 
>>
>>
>> How do I could refine the search in order to obtain those consecutive
>> days within a specific range? In the above extract:
>>
>> 1988(26) 1988(27)  1988(28)  1988(29)  1988(30)  1988(33)  1988(34)
>> 1988(35)
>>  6.863729 9.600000  9.049846  9.213438  6.412746  7.881596  6.373102
>> 7.220562
>>
>
> If zz is a zoo series time(zz) or equivalently index(zz) gives the times.

But how to aggregate, for example, 4 consecutive days with that range of 
values? I've played with aggregate(z,index(z), ...) but I can't find the 
right FUN to do this

Thanks in advance,

Antonio