FunctionStrategy

Based on the superb expression parser MESP, FunctionStrategy can generate numbers after a function, which makes it most powerful. In fact, other strategies could be considered obsolete and replaceable by FunctionStrategy; for example, ConstantStrategy could be replaced by a function like f(x) = K, or RandomStrategy by f(x) = rand(). However, these are maintained for performance reasons (they don't need to call a parser to interpret a function).
Functions in NumGen can use:

• the variable x, whose value is the iteration number (i.e. 0 for the first generated value, 1 for the second one and so on).
• the predefined functions which come with MESP (see their javadocs for a complete list).
• user-defined functions: in fact, number generators with a name. Suppose you have two generators named gen1 and gen2. Then a new generator - say gen3 - could use a function like gen2(x)/(5*gen1(x+1)).
  Note that user-defined functions:
  • have only one parameter, which is the index of the value requested to the corresponding generator.
  • can be generators using any strategy.
  • check their dependency on other generators, in order to avoid deadlocks.