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IActivationFunctionDerivative2 Method

Calculates function derivative.

Namespace:  Accord.Neuro
Assembly:  Accord.Neuro (in Accord.Neuro.dll) Version: 3.8.0
double Derivative2(
	double y
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Type: SystemDouble
Function output value - the value, which was obtained with the help of Function(Double) method.

Return Value

Type: Double
Function derivative, f'(x).

The method calculates the same derivative value as the Derivative(Double) method, but it takes not the input x value itself, but the function value, which was calculated previously with the help of Function(Double) method.

Note Note
Some applications require as function value, as derivative value, so they can save the amount of calculations using this method to calculate derivative.

See Also