R.filesets: readDataFrame.TabularTextFile – R documentation

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R.filesets

readDataFrame.TabularTextFile

Reads the tabular data as a data frame

Description

Reads the tabular data as a data frame.

Usage

## S3 method for class 'TabularTextFile'
readDataFrame(this, con=NULL, rows=NULL, nrow=NULL, trimQuotes=FALSE, ..., debug=FALSE,
  verbose=FALSE)

Arguments

`con`	(Internal) If a `connection`, then it is used, otherwise a new file connection is temporarily opened and used.
`rows`	(Optional) An `integer` `vector` specifying which rows to be read.
`nrow`	(Optional) An `integer` specifying how many rows to read. If specified, it corresponds to specifying `rows=seq_len(nrow)`.
`trimQuotes`	(Optional) If `TRUE`, quotes are trimmed from numeric columns before parsing them as numerics. This makes it possible to read quoted numeric values.
`...`	Passed to internal `*getReadArguments()`.
`debug`	If `TRUE`, additional details on the file and how it was read is returned as part of the attributes.
`verbose`	A `logical` or a `Verbose` object.

Value

Returns a data.frame.

Reading quoted numerics

If a specific data column is specified as being numeric in argument colClasses and that column contains quoted values it is necessary to use argument trimQuotes=TRUE, otherwise scan() throws an exception similar to: scan() expected 'a real', got '"1.0"'.

Author(s)

Henrik Bengtsson