Hello,
Actually, Dat_zoo is not a matrix, it is an object of classes "zooreg"
and "zoo", with a dim attribute:
class(Dat_zoo)
dim(Dat_zoo)
And the output of window() is of the same classes but without a dim
attribute:
wnd <- window(Dat_zoo, start = as.Date("2001-01-02"))
class(wnd)
dim(wnd) # NULL
You can set the dim attribute manually like this:
dim(wnd) <- c(length(wnd), 1)
Hope this helps,
Rui Barradas
Em 08-06-2013 22:02, Ron Michael escreveu:
Hi,
I observed that if I use window() function available with the 'zoo' package to
extract a portion of my times series and if that time series data is stored in
some 'zoo' object with only 1 column, then the resulting zoo object is becoming
vector.
Here is my observation:
library(zoo)
Dat <- matrix(1:3, nc = 1)
Dat
[,1]
[1,]1
[2,]2
[3,]3
Dat_zoo <- zooreg(Dat, start = as.Date("2001-01-01"), frequency = 1)
Dat_zoo
2001-01-01 1
2001-01-02 2
2001-01-03 3
window(Dat_zoo, start = as.Date("2001-01-02")) ### why it is becoming vector?
I want to retain it as matrix only
2001-01-02 2001-01-03
2 3
Here you can see that, originally my 'Dat_zoo ' object was basically a matrix.
However once I use window() function, it became vector.
Is there any possibility to retain the shape of the original object,
particularly if that object is matrix with 1 column?
Thank you very much for your help.
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