This capability that ts objects have seems ill-advised. There is always a
meaning associated with which row and column a matrix has, and this assumes that
the shorter dimension is associated with times corresponding to the first rows
of the longer matrix. In general you don't know whether the NAs should be at
the beginning or whether there are missing rows in the middle, or even whether
the time intervals don't overlap at all or are on different intervals. IMO
there should be a separate step required before cbind that resolves these
questions and appropriately extends the dimension rather than embedding this
particular resolution approach into the cbind function. It could be as simple as
an "extend Rows" function... as long as it is explicit in the calling
code where this strategy can more easily be identified, debated, and fixed.
On June 29, 2025 4:56:23 AM PDT, Gabor Grothendieck <ggrothendieck at
gmail.com> wrote:>cbind does work on differently shaped ts objects so:
>
> a <- matrix(1:12,nrow=6)
> b <- matrix(5:12,nrow=4)
>
> tmp <- cbind(ts(a), ts(b))
> array(tmp, dim(tmp))
>
>giving
>
> [,1] [,2] [,3] [,4]
> [1,] 1 7 5 9
> [2,] 2 8 6 10
> [3,] 3 9 7 11
> [4,] 4 10 8 12
> [5,] 5 11 NA NA
>
>On Thu, Jun 26, 2025 at 6:47?AM Steven Yen <styen at ntu.edu.tw>
wrote:
>>
>> I'd like to cbind matrices of different number of rows, with
missing values filled by "NA". I used dplyr. The following is
obviously not working. Help appreciated.
>>
>> > library(dplyr)
>> > a<-matrix(1:12,nrow=6); a
>> [,1] [,2]
>> [1,] 1 7
>> [2,] 2 8
>> [3,] 3 9
>> [4,] 4 10
>> [5,] 5 11
>> [6,] 6 12
>> > b<-matrix(5:12,nrow=4); b
>> [,1] [,2]
>> [1,] 5 9
>> [2,] 6 10
>> [3,] 7 11
>> [4,] 8 12
>> > cbind.fill(a,b)
>> Error in cbind.fill(a, b) : could not find function
"cbind.fill"
>>
>> Steven from iPhone
>> [[alternative HTML version deleted]]
>>
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>> and provide commented, minimal, self-contained, reproducible code.
>
>
>
--
Sent from my phone. Please excuse my brevity.