[R] How to setup the tsp attribute of a dataset

[Gabor Grothendieck]

Not for me.

> x <- 1:100
> x.ts <- ts(x, start = 1, frequency = 4)
> frequency(x.ts)
[1] 4


On Fri, Nov 20, 2009 at 6:21 PM, Samik Raychaudhuri <samikr at gmail.com> wrote:
> Thanks Gabor. Even after doing as you suggested, when I check the frequency
> of x, it still shows up as 1. I would have expected it to be 4 now.
>> x.ts <- ts(x, start=1, frequency=4)
>> frequency(x)
> [1] 1
>
> On 11/20/2009 4:05 PM, Gabor Grothendieck wrote:
>>
>> The first two components of the tsp vector are in time units as
>> mentioned in ?tsp . Thus you would want:
>>
>>
>>>
>>> x <- 1:100
>>> tsp(x) <- c(1, 25.75, 4)
>>>
>>
>> but normally you don't have to set it explicitly in the first place.
>> Just use ts:
>>
>>
>>>
>>> x <- 1:100
>>> x.ts <- ts(x, start = 1, frequency = 4)
>>> tsp(x.ts)
>>>
>>
>> [1]  1.00 25.75  4.00
>>
>>>
>>> x.ts
>>>
>>
>>   Qtr1 Qtr2 Qtr3 Qtr4
>> 1     1    2    3    4
>> 2     5    6    7    8
>> 3     9   10   11   12
>> 4    13   14   15   16
>> 5    17   18   19   20
>> 6    21   22   23   24
>> 7    25   26   27   28
>> 8    29   30   31   32
>> 9    33   34   35   36
>> 10   37   38   39   40
>> 11   41   42   43   44
>> 12   45   46   47   48
>> 13   49   50   51   52
>> 14   53   54   55   56
>> 15   57   58   59   60
>> 16   61   62   63   64
>> 17   65   66   67   68
>> 18   69   70   71   72
>> 19   73   74   75   76
>> 20   77   78   79   80
>> 21   81   82   83   84
>> 22   85   86   87   88
>> 23   89   90   91   92
>> 24   93   94   95   96
>> 25   97   98   99  100
>>
>>
>> On Fri, Nov 20, 2009 at 5:53 PM, Samik Raychaudhuri <samikr at gmail.com>
>> wrote:
>>
>>>
>>> Hello,
>>> I am wondering how I should set up the tsp attribute (available through
>>> attr(x, "tsp")) of a dataset x? Let's assume that x has 100 points, and I
>>> want to set the frequency to 4.
>>> I tried:
>>>
>>>>
>>>> attr(x,"tsp")<-c(1,100,4)
>>>>
>>>
>>> Error in attr(x, "tsp") <- c(1, 100, 4) :
>>>  invalid time series parameters specified
>>> Is there any other way to set the frequency of the data?
>>> Thanks.
>>> -Samik
>>>
>>> ______________________________________________
>>> R-help at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>>> http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>>>
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>