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l2norm
Compute L2 distance between two vectors of numbers.
DESCRIPTION
Compute L2 distance between two vectors of numbers (square root of sum
of squares of differences between two vectors).
USAGE
l2norm(u,v)
REQUIRED ARGUMENTS
- u
- first vector of numbers
- v
- second vector of numbers
OPTIONAL ARGUMENTS
None.
VALUE
A real number which is the L2 distance between two vectors.
SIDE EFFECTS
None.
DETAILS
Function simply computes the L2 distance between two vectors and is
implemented as
sqrt(sum((u-v)^2))
RELEASE
Version 3.6 Copyright Guy Nason 1995
SEE ALSO
linfnorm,
wstCV,
wstCVl.
BUGS
This function would probably be more accurate if it used the
Splus function vecnorm.
EXAMPLES
#
# What is the L2 norm between the following sets of vectors
#
p <- c(1,2,3,4,5)
q <- c(1,2,3,4,5)
r <- c(2,3,4,5,6)
l2norm(p,q)
# [1] 0
l2norm(q,r)
# [1] 2.236068
l2norm(r,p)
# [1] 2.236068