klaR (version 0.6-15)

# tritrafo: Barycentric plots

## Description

Function to carry out the transformation into 2D space for `triplot`, `trilines` etc.

## Usage

`tritrafo(x, y = NULL, z = NULL, check = TRUE, tolerance = 0.0001)`

## Arguments

x

Vector of fractions of first component OR 3-column matrix containing all three components (omitting `y` and `z`) OR 3-element vector (for all three components, omitting `y` and `z`).

y

(optional) vector of fractions of second component.

z

(optional) vector of fractions of third component.

check

if `TRUE`, it is checked whether `x+y+z=1` and `x,y,z>=0` for all cases.

tolerance

tolerance for above sum check.

## Value

A matrix with two columns corresponding to the two dimensions.

## Details

Projects the mixture given by `x`, `y`, and `z` with `x`, `y`, `z` between one and zero and `x+y+z=1` into a two-dimensional space.

For further details see `triplot`.

## See Also

`triplot`, `tripoints`, `trilines`, `trigrid`

## Examples

```# NOT RUN {
tritrafo(0.1, 0.2, 0.7)
tritrafo(0.1, 0.2, 0.6) # warning

triplot()
points(tritrafo(0.1, 0.2, 0.7), col="red")
tripoints(0.1, 0.2, 0.7, col="green")  # the same

tritrafo(c(0.1,0.2), c(0.3,0.4), c(0.6,0.4))
tritrafo(diag(3))

point <- c(0.25,0.6,0.15)
triplot(point, pch=16)
text(tritrafo(point), "(0.25, 0.60, 0.15)", adj=c(0.5,2)) # add a label
# }
```