It will be difficult or impossible to store objects of
class Date in a matrix -- you'll need to store them
in a data frame:
pts = seq(as.Date("2011-01-01"), as.Date("2011-01-09"), by="1 day")
z = data.frame(pts[1:3],pts[4:6],pts[7:9])
z
pts.1.3. pts.4.6. pts.7.9.
1 2011-01-01 2011-01-04 2011-01-07
2 2011-01-02 2011-01-05 2011-01-08
3 2011-01-03 2011-01-06 2011-01-09
sapply(z,class)
pts.1.3. pts.4.6. pts.7.9.
"Date" "Date" "Date"
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Sat, 12 Mar 2011, Bogaso Christofer wrote:
Dear all, when I put date objects (class of 'Date') in a matrix it becomes
numeric:
dat <- matrix(seq(as.Date("2011-01-01"), as.Date("2011-01-09"), by="1
day"), 3)
dat
[,1] [,2] [,3]
[1,] 14975 14978 14981
[2,] 14976 14979 14982
[3,] 14977 14980 14983
class(dat[1,1])
[1] "numeric"
As it could not preserve the 'Date' characteristics after putting my Date
observations, I find it difficult to carry forward further calculation with
Dates. Can somebody help me on how to preserve the Data properties while
storing them within some matrix?
Thanks
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