recommend
fun recommendScalingFactor(func: FunctionIfc, interval: Interval, initialPt: Double, delta: Double): Double(source)
Recommends a scaleFactor by fitting a linear approximation to func near initialPt over a +/-delta neighbourhood.
factor = min(1/|f(initialPt)|, 1/|slope|)Content copied to clipboard
Clamped to 1.0, DEFAULT_SCALE_FACTOR. Floored to 1.0 if the computed value falls below DEFAULT_SCALE_FACTOR * DEFAULT_PRECISION.
This is a heuristic. Verify convergence and adjust manually if needed.
Return
Recommended scale factor in 1.0, DEFAULT_SCALE_FACTOR.
Parameters
func
Function being searched.
interval
Used to clamp the evaluation neighbourhood to the valid domain.
initial
Point around which the approximation is made. Must be in interval.
delta
Neighbourhood half-width. Must be > 0.