subset.ts | R Documentation |
Various types of subsetting of a time series. Allows subsetting by index
values (unlike window
). Also allows extraction of the
values of a specific season or subset of seasons in each year. For example,
to extract all values for the month of May from a time series.
## S3 method for class 'ts'
subset(
x,
subset = NULL,
month = NULL,
quarter = NULL,
season = NULL,
start = NULL,
end = NULL,
...
)
## S3 method for class 'msts'
subset(x, subset = NULL, start = NULL, end = NULL, ...)
x |
a univariate time series to be subsetted |
subset |
optional logical expression indicating elements to keep;
missing values are taken as false. |
month |
Numeric or character vector of months to retain. Partial matching on month names used. |
quarter |
Numeric or character vector of quarters to retain. |
season |
Numeric vector of seasons to retain. |
start |
Index of start of contiguous subset. |
end |
Index of end of contiguous subset. |
... |
Other arguments, unused. |
If character values for months are used, either upper or lower case may be
used, and partial unambiguous names are acceptable. Possible character
values for quarters are "Q1"
, "Q2"
, "Q3"
, and
"Q4"
.
If subset
is used, a numeric vector is returned with no ts
attributes. If start
and/or end
are used, a ts object is
returned consisting of x[start:end], with the appropriate time series
attributes retained. Otherwise, a ts object is returned with frequency equal
to the length of month
, quarter
or season
.
Rob J Hyndman
subset
, window
plot(subset(gas,month="November"))
subset(woolyrnq,quarter=3)
subset(USAccDeaths, start=49)
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