| +,CFtime,numeric-method {CFtime} | R Documentation |
Extend a CFtime object with additional offsets
Description
A CFtime instance can be extended by adding additional offsets using this
operator.
Usage
## S4 method for signature 'CFtime,numeric'
e1 + e2
Arguments
e1 |
CFtime. Instance of the |
e2 |
numeric. Vector of offsets to be added to the |
Details
The resulting CFtime instance will have its offsets in the order that they
are added, meaning that the offsets from the CFtime instance come first and
those from the numeric vector follow. There is no reordering or removal of
duplicates. This is because the time series are usually associated with a
data set and the correspondence between the two is thus preserved, if and
only if the data sets are merged in the same order.
Note that when adding multiple vectors of offsets to a CFtime instance, it
is more efficient to first concatenate the vectors and then do a final
addition to the CFtime instance. So avoid CFtime(definition, calendar, e1) + CFtime(definition, calendar, e2) + CFtime(definition, calendar, e3) + ...
but rather do CFtime(definition, calendar, e1) + c(e2, e3, ...). It is the
responsibility of the operator to ensure that the offsets of the different
data sets are in reference to the same datum.
Negative offsets will generate an error.
Value
A CFtime object with offsets composed of the CFtime instance and
the numeric vector.
Examples
e1 <- CFtime("days since 1850-01-01", "gregorian", 0:364)
e2 <- 365:729
e1 + e2