trifield (version 1.0)

ternary.apply: Apply a function over a ternary grid

Description

Given 1) a ternary grid and 2) a function that takes a ternary value as its first argument, this function returns a vector formed by applying the function to each point in the grid.

Usage

ternary.apply(grid, f, ...)

Arguments

grid

A data frame with columns a, b and c specifying points in a ternary field

f

A function that accepts a length 3 vector as its first argument

...

Additional arguments passed to f

Value

• A vector of results

Details

Results will be concatenated into a vector; it is most useful for scalar-valued functions.

See Also

ternary.field

Examples

## The function is currently defined as
function(grid, f, ...)
{
	f = match.fun(f)
	abc = grid[,letters[1:3]]
	g = function(i) f(abc[i,], ...)
	unlist(lapply(1:nrow(grid), g))
  }