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

Samik Raychaudhuri samikr at gmail.com
Sat Nov 21 00:21:23 CET 2009


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
>>
>> ______________________________________________
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>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>



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