amap (version 0.3)

distpar: Parallelized Distance Matrix Computation

Description

This function computes and returns the distance matrix computed by using the specified distance measure to compute the distances between the rows of a data matrix.

Usage

distpar(x, method = "euclidean", nbproc = 2, diag = FALSE, upper = FALSE)

Value

An object of class "dist".

See Also

dist

Examples

x <- matrix(rnorm(100), nrow=5)
dist(x)
dist(x, diag = TRUE)
dist(x, upper = TRUE)
m <- as.matrix(dist(x))
d <- as.dist(m)
stopifnot(d == dist(x))
names(d) <- LETTERS[1:5]
print(d, digits = 3)

## example of binary and canberra distances.
x <- c(0, 0, 1, 1, 1, 1)
y <- c(1, 0, 1, 1, 0, 1)
dist(rbind(x,y), method="binary")
## answer 0.4 = 2/5
dist(rbind(x,y), method="canberra")
## answer 2 * (6/5)