October 05, 2011

Functions as Return Values (Introduction to Statistical Computing)

Lecture 11: Functions in R are objects, just like everything else, and so can be returned by other functions, with no special machinery required. Examples from math (especially calculus) of operators, which turn one function into another. The importance of scoping when using functions as return values. Example: creating a linear predictor. Example: implementing the gradient operator (two different ways). Example: writing surface, as a two-dimensional analog to the standard curve. The use of eval and substitute to control when and in what context an expression is evaluated. Three increasingly refined versions of surface, employing eval. — R for examples.

Introduction to Statistical Computing

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