Format Distance Matrix (Matlab Style)

Format or generate a distance matrix.

squareform(x)

Arguments

x

numeric vector or matrix.

Details

If x is a vector as created by the dist function, it converts it into a fulll square, symmetric matrix. And if x is a distance matrix, i.e. square, symmetric amd with zero diagonal elements, it returns the flattened lower triangular submatrix.

Value

Returns a matrix if x is a vector, and a vextor if x is a matrix.

See also

dist

Examples

x <- 1:6
y <- squareform(x)
#  0  1  2  3
#  1  0  4  5
#  2  4  0  6
#  3  5  6  0
all(squareform(y) == x)
#> [1] TRUE
# TRUE