ts_table | R Documentation |
Create a ts_table
.
ts_table(data, timestamp, columns)
data |
numeric |
timestamp |
|
columns |
column names |
Create a time-series table (ts_table
). A
ts_table
is a numeric matrix, so there is
always a dim
attribute. For a ts_table
x
, you get the number of observations with
dim(x)[1L]
.
Attached to this matrix are several attributes:
a vector: the numeric representation of the timestamp
character: the class of the original
timestamp, either Date
or POSIXct
a character vector that provides the columns names
There may be other attributes as well, but these three are always present.
Timestamps must be of class Date
or
POSIXct
(POSIXlt
is
converted). A tzone
attribute is dropped.
A ts_table
is not meant as a time-series
class. For most computations (plotting, calculation
of statistics, etc.), the ts_table
must first
be coerced to zoo
, xts
, a
data.frame
or a similar data
structure. Methods that perform such coercions are
responsible for converting the numeric timestamp
vector to an actual timestamp. For this, they may use
the function ttime
(‘translate time’).
a ts_table
Enrico Schumann
as.ts_table
ts_table(1:5, Sys.Date() - 5:1, columns = "value")
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