How to setup the tsp attribute of a dataset

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

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