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

writeColumnsToFiles.GenericTabularFile {R.filesets} | R Documentation

## 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 occured.

### Value

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

### Author(s)

Henrik Bengtsson

### See Also

For more information see `GenericTabularFile`.

[Package R.filesets version 2.11.0 Index]