Function correlation

correlation(
    func1: ChalkboardFunction,
    func2: ChalkboardFunction,
    val: number,
): number
Calculates the cross-correlation of two functions at a value.
Parameters
- func1: ChalkboardFunction
  The first function
- func2: ChalkboardFunction
  The second function
- val: number
  The value
Returns number
- Defined in Chalkboard.calc.ts:65