input: Data Input
In tera-insights/gtBase: R Interface for the Grokit System

Description Usage Arguments Details Value Author(s)

Reads a file or relation from the disk and creates an object of class "data".

Read(relation)

ReadCSV(file, attributes, skip = 0, sep = ",", simple = FALSE, nrows = 10000, ...)

ReadFile(file, gi, attributes, ...)

ReadRelation(file, relation, sep = ",", simple = FALSE)

`relation`	For `Read`: the relation to read. For `ReadRelation`: the relation whose schema is used.
`file`	the path of the file to read expressed as a character.
`skip`	as the argument of the same name in `read.csv`. Should be adjusted accordingly to account for a header line.
`attributes`	the desired column names for the data. See ‘Details’ for more information.
`sep`	as the argument of the same name in `read.csv`
`simple`	should the simple algorithm be used.
`nrows`	the number of rows used by `read.csv` to get a sample.
`...`	For `ReadCSV`: additional arguments to `read.csv`. For `ReadFile`: additional arguments to `read.table`.
`gi`	a templated GI function.

All four functions construct an object of class "data" in different fashions.

Read uses both the data and the names of the specified relation, whereas the rest read from a file.
ReadCSV behaves similarly to read.csv. The data in the specified file is read in using character separated values, with EOL characters separating rows. The names of the columns are detailed in the section ‘AUTO’.
ReadFile is a generalized version of ReadCSV and reads a file using an arbitrary generalized input function. Currently deprecated as there are none other than ReadCSV.
ReadRelation is a specific case of ReadCSV. The file provides the data but the names of the relation are used. The data is read in as ReadCSV with skip = 0 and sep = ", ".

attributes should be specified as a call to c in which each argument is either a symbol specifying the name of an attribute or a name = type pair. In the latter case, the name of the argument specifies the name of the attribute and type specifies the type of that attribute. type can either be specified as a symbol or a call, in which the name of the call is the type to be used and the arguments will be used to template the type.

An object of class "data" that represents the relevant data.

Jon Claus at Tera Insights LLC

tera-insights/gtBase documentation built on May 31, 2019, 8:35 a.m.