gadget_file: Gadget file objects

In mfdb: MareFrame DB Querying Library

Gadget file objects

Description

Structures representing an individual GADGET data file.

Usage

gadget_file(file_name, components = list(), data = NULL, file_type = c())
## S3 method for class 'gadget_file'
print(x, ...)
## S3 method for class 'gadget_file'
as.character(x, ...)
read.gadget_file(file_name, file_type = c(), fileEncoding = "UTF-8")

Arguments

file_name	Filename the output should be written to / read from
components	A list of lists, representing each component. See details.
data	A data.frame representing the tabular data at the end of a file.
file_type	A character vector that alters how the file is parsed. Currently either NULL or "bare_component", which implies we write "something" instead of "[something]".
x	gadget_file object
fileEncoding	File's characterset. Defaults to UTF-8
...	Unused

Details

For our purposes, a gadget file is broken down into components, where the first component is any key/value data at the top of the file. Each section separated by "[something]" is considered a new component. Each component is a list of key /values, where values can be vectors of multiple values. Also components can have comments prepended by adding a "preamble" attribute.

In slight deviation to GADGET spec, we insist that tabular data begins with "; – data –", to avoid any ambiguity on when it starts.

Value

gadget_file Returns a gadget_file object, a list of components.

print.gadget_file Prints the gadget file as it would be written to the filesystem.

as.character.gadget_file Returns a character string of the gadget file as it would be written to the filesystem.

read.gadget_file Returns a gadget_file object, a list of components.

Examples

# Simple key/values
gadget_file("age", components = list(
    list(length = 5, age = 1:5)))

# Multiple components
gadget_file("likelihood", components = list(
    list(),
    component = structure(list(type = "penalty"), preamble = list("comment")),
    component = structure(list(type = "penalty"), preamble = list("", "another comment"))))

# Data
gadget_file("agelen", components = list(
    list(stocknames = "cod")), data = data.frame(
    area = c(102, 103),
    number = c(2345, 5023)))

mfdb documentation built on June 21, 2022, 5:07 p.m.