A convenience function that returns a data.frame with a column representing the input values and a column with results. This is still experimental and will not work for many input structures.
dtapply(
X,
FUN,
value.names = NULL,
element.name = "element",
fill = TRUE,
as.fun,
...
)Like for `lapply()`, an object to process (typically a vector or a list). Passed to `lapply()`.
Function to run for each element in `X`. Passed to `lapply()`.
If supplied, setnames will be run on each element returned by lapply wit value.names as the `new` argument.
What to call the column holding the values or the names of `X`? Default is "element". What goes into this column depends on the class of `X`. If `X` is a character vector, it will be the values of `X`. If `X` is a list, it will be the names of the elements in the list.
Fill resulting data with `NA`s in order to combine into a single `data.frame`? Default is TRUE.
The default is to return data as a data.frame. Pass a function in as.fun to convert to something else. If data.tables are wanted, use `as.fun="data.table"`. The default can be configured using `NMdataConf()`.
arguments passed to lapply
a data.table
Only functions that return vectors are currently supported. dtapply should support functions that return data.frames.