writeColumnsToFiles.GenericTabularFile: Read each column from a data file and exports it to a...

In R.filesets: Easy Handling of and Access to Files Organized in Structured Directories

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

See Also

For more information see GenericTabularFile.

R.filesets documentation built on May 29, 2024, 9:10 a.m.