Calculating all distances between one point and a group of points efficiently in R

Question

First of all, I am new to R (I started yesterday).

I have two groups of points, data and centers, the first one of size n and

Answer 1

rdist() is a R function from {fields} package which is able to calculate distances between two sets of points in matrix format quickly.

https://www.image.ucar.edu/~nychka/Fields/Help/rdist.html

Usage :

library(fields)
#generating fake data
n <- 5
m <- 10
d <- 3

x <- matrix(rnorm(n * d), ncol = d)
y <- matrix(rnorm(m * d), ncol = d)

rdist(x, y)
          [,1]     [,2]      [,3]     [,4]     [,5]
 [1,] 1.512383 3.053084 3.1420322 4.942360 3.345619
 [2,] 3.531150 4.593120 1.9895867 4.212358 2.868283
 [3,] 1.925701 2.217248 2.4232672 4.529040 2.243467
 [4,] 2.751179 2.260113 2.2469334 3.674180 1.701388
 [5,] 3.303224 3.888610 0.5091929 4.563767 1.661411
 [6,] 3.188290 3.304657 3.6668867 3.599771 3.453358
 [7,] 2.891969 2.823296 1.6926825 4.845681 1.544732
 [8,] 2.987394 1.553104 2.8849988 4.683407 2.000689
 [9,] 3.199353 2.822421 1.5221291 4.414465 1.078257
[10,] 2.492993 2.994359 3.3573190 6.498129 3.337441