The das_dfr class is a subclass of data.frame,
created to provide a concise and robust way to ensure that the input to das_process
adheres to certain requirements.
Specifically, objects of class das_dfr are data frames with specific column names and classes,
as detailed in the 'Properties of das_dfr' section. Objects of class das_dfr are created by
das_read or as_das_dfr, and are intended to be passed directly to
das_process.
Subsetting or otherwise altering an object of class das_dfr will cause the object to drop its
das_dfr class attribute. das_process will then try to coerce the object to a
das_dfr object. It is strongly recommended to pass an object of class das_dfr to
das_process before subsetting, e.g. for events from a certain date range.
Properties of das_dfr objects
Objects of class das_dfr have a class attribute of c("das_dfr", "data.frame").
In addition, they must have the following column names and classes:
| Column name | Column class |
| Event | "character" |
| EffortDot | "logical" |
| DateTime | c("POSIXct", "POSIXt") |
| Lat | "numeric" |
| Lon | "numeric" |
| Data1 | "character" |
| Data2 | "character" |
| Data3 | "character" |
| Data4 | "character" |
| Data5 | "character" |
| Data6 | "character" |
| Data7 | "character" |
| Data8 | "character" |
| Data9 | "character" |
| Data10 | "character" |
| Data11 | "character" |
| Data12 | "character" |
| EventNum | "integer" |
| file_das | "character" |
| line_num | "integer" |