Anonymous Functions
Here is an example of an anonymous function. It generates a vector of values but the function is not allocated a name (although the answer could be).
(function(x,y){ z <- 2*x^2 + y^2; x+y+z })(0:7, 1)
[1] 2 5 12 23 38 57 8 0 107
The function first uses the supplied values of x and y to calculate z, then returns the value of x + y + z evaluated for eight values of x (from 0 to 7) and one value of y (1). Anonymous functions are used most frequently with apply, sapply and lapply (p. 68).
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