[R] How can I declare an empty zoo object?

[arun]

Hi,

When you cbind two zoo objects, I guess the index should match, otherwise it gives warning messages:

x1zoo_f<-zoo(rnorm(5,25),c(1,5,10,15,9))
xzoo<-zoo(c(5,9,10,15),c(1,5,9,10,15))
cbind(xzoo,x1zoo_f)
   xzoo  x1zoo_f
1     5 24.85877
5     9 25.09264
9    10 25.79896
10   15 26.70625
15    5 24.63533
#If index is different
xzoo<-zoo(c(5,9,10,15,25), 1:5)
 cbind(xzoo,x1zoo_f)
   xzoo  x1zoo_f
1     5 24.85877
2     9       NA
3    10       NA
4    15       NA
5    25 25.09264
9    NA 25.79896
10   NA 26.70625
15   NA 24.63533
Warning message:
In merge.zoo(..., all = all, fill = fill, suffixes = suffixes, retclass = "zoo",  :
  Index vectors are of different classes: integer numeric
######## now, with empty zoo object with same index
xzoo<-zoo(,c(1,5,9,10,15))
 str(xzoo)
‘zoo’ series (without observations)
 cbind(xzoo,x1zoo_f)
    x1zoo_f
1  24.85877
5  25.09264
9  25.79896
10 26.70625
15 24.63533

A.K.




From: jpm miao <miaojpm at gmail.com>

To: r-help <r-help at r-project.org>
Cc: 
Sent: Tuesday, July 31, 2012 12:18 AM
Subject: [R] How can I declare an empty zoo object?

Hi,

   I let xzoo be an empty  object:

> xzoo<-{}


   and I have an existing zoo object x1zoo_f. I would like to combine
the two to make a new zoo object, and continue doing so in a loop,
which is not shown here. However, when I type


> xzoo<-cbind(xzoo, x1zoo_f)


   An error message emerges


Error in zoo(structure(x, dim = dim(x)), index(x), ...) :
  “x” : attempt to define invalid zoo object


   Is there any way to define an empty zoo object?


  Thanks,


Miao

    [[alternative HTML version deleted]]


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