R.filesets: writeColumnsToFiles.GenericTabularFile – R documentation

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writeColumnsToFiles.GenericTabularFile

Read each column from a data file and exports it to a separate file

Description

Read each column from a data file and exports it to a separate file. Since each column is processed independently of the others, this method is memory efficient and can handle very large data files.

Usage

## S3 method for class 'GenericTabularFile'
writeColumnsToFiles(this, destPath, filenameFmt="%s.txt", tags=NULL, columnName=NULL,
  header=NULL, ..., verbose=FALSE)

Arguments

`destPath`	The output directory where to write the files.
`filenameFmt`	An `sprintf`() format string used to generate filenames given the fullnames (column names plus tags).
`tags`	An optional `character` `vector` of tags added to the fullnames.
`columnName`	...
`header`	An optional file header.
`...`	Not used.
`verbose`	See `Verbose`.

Details

Each file generated is written atomically by first writing to a temporary file which is then renamed if successfully written. This minimizes the risk for creating incomplete files, which otherwise may occur if for instance an interrupt occurred.

Value

Returns (invisibly) a character vector of all output files.

Author(s)

Henrik Bengtsson