euclidean: Euclidean distances between the rows of two matrices

In vcastellar/fastDist: What the package does (short line)

Euclidean distances between the rows of two matrices

Description

Function for calculating Euclidean distances between the rows of two matrices

Usage

fastPDist2(A, B)

Arguments

A	numerical matrix with dimesions (m, k)
B	numerical matrix with dimesions (n, k)

Details

The euclidean distance between two vectors $x$ e $y$ is

||x-y||_2 = (∑_{i=1}^k (x_i - y_i)^2)^{1/2}

We use the property (x - y)^2 = x^2 -2xy + y^2 for increase the speed

Value

A numeric matrix with dimensions (m, n) where (i, j) is the euclidean distance between the row i of mnatrix A and the row j of matrix B

Author(s)

Vicente Castellar Sebastiá

References

See the documentation for Armadillo, and RcppArmadillo, for more details.

Examples

  A <- matrix(rnorm(5000), 500, 10)
  B <- matrix(rnorm(1000), 100, 10)
  fastPdist2(A, B)

vcastellar/fastDist documentation built on Feb. 10, 2023, 8:17 a.m.