fingerprint (version 2.1)

fold: Fold a fingerprint

Description

In many situations a fingerprint is generated using a large length (such as 1024 bits or more). As a result of this, the fingerprints for a dataset can be very sparse. One approach to increasing bit density of such fingerprints is to fold them. This is performed by dividing the original fingerprint bitstring into two substrings of equal length and then perform an XOR on the two substrings.

It should be noted that many fingerprint generating routines will perform this internally.

Usage

fold(fp)

Arguments

fp

The fingerprint to fold. Should be of class fingerprint.

Value

• An object of class fingerprint representing the folded fingerprint.

See Also

xor

Examples

# make a fingerprint vector
fp <- new("fingerprint", nbit=64, bits=sample(1:64, 30))
fold(fp)