apply_adapters_: Helper function for 'apply_adapters()'

In a-maldet/readall: Read FWF, DSV, EXCEL And SAS Files

Description

Helper function for apply_adapters()

Usage

apply_adapters_(
  data,
  file_definition,
  err_h = composerr("Error while calling 'apply_adapters_()'")
)

Arguments

data	The data.frame, which should be modified
file_definition	A file_definition class object holding the adapter functions, which should be applied to the data.frame.
err_h	An error handler

Value

The modified data.frame

adapters

An adapter function is a function that takes a data.frame as input argument and returns a modified version of this data.frame. The adapter functions are stored in an adapters class object, which is a special list that contains all adapter functions and a description text of each function. This class objects can be created by using the function new_adapters(). The adapters class objects can be added to a file_structure or a file_definition or a file_collection class object. After reading a data file (by calling read_data(file_definition)) all adapter functions listed in the adapters argument of the file_definition]new_file_definition() class object will be applied consecutively to the loaded data set. Adapter functions can be added to an existing file_structure or a file_definition or a file_collection class object by using the function add_adapters(). Adapter functions can be used for several tasks:

• adapt the data sets in such a way that they can be concatenated for mutliple years

• compute new variables from existing variables

• fix errors in variables

• transform the values of a variable of an older data set, such that it complies with a newer variable definition

a-maldet/readall documentation built on Dec. 18, 2021, 9:23 p.m.