rgr (version 1.1.15)

gx.symm.coords.mat: Create a Matrix of Symmetric Coordinates

Description

Function to compute a matrix of symmetric coordinates for any two parts, v1 and v2, of a n by p data frame or matrix of compositions.

Usage

gx.symm.coords.mat(x, v1, v2)

Arguments

x

a data frame or matrix of compositions.

v1

the index of the first part for which symmetric coordinates are required.

v2

the index of the second part for which symmetric coordinates are required.

Value

z

a n by 2 matrix containing the symmetric coordinates of parts v1 and v2. The column names are the names of the parts in the input data frame or matrix x.

References

Kynclova, P., Hron, K., and Filzmoser, P., 2017. Correlation Between Compositional Parts Based on Symmetric Balances. Mathematical Geosciences, 49:777-796.

See Also

gx.symm.coords

Examples

# NOT RUN {
## Make test data available
data(nockolds)

## Compute and display symmetric coordinates for Ca and Na
gx.symm.coords.mat(nockolds, 6, 7)

## Detach test data
rm(nockolds)
# }