new_file_meta: Create a new 'file_meta' class object

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

Description

This class holds a list of col_meta class objects. For more details about col_meta class objects see section meta information. file_meta class objects are usually stored in file_structure class objects or file_definition class objects or as attributes of data.frames.

Usage

new_file_meta(...)

Arguments

...	None, one or multiple col_meta class objects

Value

A new file_meta class object, holding all passed in col_meta class objects.

meta information

The col_meta class objects are used in order to store some meta information about single data columns, like additional column desciptions, and column value/level descriptions. In order to store meta information about a set of columns a file_meta class object can be used. This objects store a list of col_meta class objects, where each col_meta class object corresponds to a specific column in a data set. This file_meta class objects are usually stored in file_structure class objects or file_definition class objects. But when calling read_data(), the meta information gets also appended to the resulting data.frame. The meta information stored in a file_structure, a file_definition class object or a read data.frame can be extracted by using the function get_meta(). A col_meta class object holds the following informations:

• desc: A string holding the column description.

• values: A vector (character/logical/numeric) usually holding the possible column values (e.g. c(1, 2)) or a more abstract text version of the column values (e.g. c("JJJJMMDD", "99999999", "")).

• values_desc: A character vector that corresponds to the values vector. Each entry of values_desc is a more detailed description of the corresponding entry in values. If some descriptions are not present, the entries are NA values.

See Also

new_col_meta(), get_meta()

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