print.hdd {hdd}

Print method for HDD objects

Description

This functions displays the first and last lines of a hard drive data set (HDD).

Usage

## S3 method for class 'hdd'
print(x, ...)

Arguments

x

A HDD object.

...

Not currently used.

Details

Returns the first and last 3 lines of a HDD object. Also formats the values displayed on screen (typically: add commas to increase the readability of large integers).

Value

Nothing is returned.

Author(s)

Laurent Berge

See Also

See hdd, sub-.hdd and cash-.hdd for the extraction and manipulation of out of memory data. For importation of HDD data sets from text files: see txt2hdd.

See hdd_slice to apply functions to chunks of data (and create HDD objects) and hdd_merge to merge large files.

To create/reshape HDD objects from memory or from other HDD objects, see write_hdd.

To display general information from HDD objects: origin, summary.hdd, print.hdd, dim.hdd and names.hdd.

Examples

# Toy example with iris data
iris_path = tempfile()
fwrite(iris, iris_path)

# destination path
hdd_path = tempfile()

# reading the text file with 50 rows chunks:
txt2hdd(iris_path, dirDest = hdd_path, rowsPerChunk = 50)

# creating a HDD object
base_hdd = hdd(hdd_path)

# Summary information on the whole data set
summary(base_hdd)

# Looking at it like a regular data.frame
print(base_hdd)
dim(base_hdd)
names(base_hdd)