Attaching and Prefixing
The append and prepend methods are used to extend a time series by attaching or prefixing another time series.
The initial time series is called Fixed time series.
Append
The Append method extends the time series by attaching a time series to it.
The first data point of the appended time series is appended after the last data point of the Fixed time series at a Time difference specified by the user. The absolute time information of the attached time series is replaced.
To start the method, use the entries in the menu bar or the context menu of the time series in the Project Explorer Methods → Combine time series → Append (see following figure) or the key combination <Ctrl>+<Alt>+<A>.
In the window that opens (see figure below), select the Fixed time series (initial time series) and the Time series to be appended.
The attached time series may also be the initial time series, so that in this case the time series is doubled. For this special case there is also the alternative method of Multiplying.
Specify the length of the time step between the Fixed and the appended time series. This is the Time difference (in days, hours, minutes, and seconds) between the start of the last time step of the Fixed time series and the start of the first time step of the attached time series.
Select whether the existing time series should be overwritten with the extended one or whether the extended one should be created as new time series.
The following figure illustrates schematically how to append a time series.
The result time series starts with the values of the Fixed time series and ends with the values of the appended time series (see following figure).
Prepend
The Prepend method extends the time series by prefixing it with a time series.
The preceding time series is placed at a user-defined Time difference between its last data point and the first data point of the Fixed time series. The absolute time information of the preceding time series is replaced.
To start the method, use the entries in the menu bar or the context menu of the time series in the Project Explorer Methods → Combine time series → Prepend (see the following figure) or the key combination <Ctrl>+<Alt>+<P>.
In the window that opens (see figure below), select the Fixed time series (initial time series) and the Time series to be prepended.
The preceding time series may also be the initial time series, so that in this case the time series is doubled.
Specify the length of the time step between the Fixed and the prepended time series. This is the Time difference (in days, hours, minutes, and seconds) that exists between the start of the last time step of the prefixed time series and the start of the first time step of the Fixed time series.
Select whether the existing time series should be overwritten with the extended one or whether the extended one should be created as a new time series.
The following figure illustrates schematically the prepending of a time series.
The result time series starts with the values of the prepended time series and ends with the values of the Fixed time series (see following figure).
