Dear all,
I don't understand the usage of the new DerivativeStructure in version 3
of the commons math.
In the old version I had the following function, which was then used in
the Newton solver:
public class MyFunction implements
DifferentiableUnivariateRealFunction {
public double value(double x) {
// example value
return x*x;
}
public UnivariateRealFunction derivative() {
return new UnivariateRealFunction() {
public double value(double x) {
// example derivative
return 2.*x;
}
}
}
}
To use the Newton Raphson solver in version 3, I have to implement the
new UnivariateDifferentiableFunction interface:
public class MyFunctionNew implements
UnivariateDifferentiableFunction {
public double value(double x) {
// example value
return x*x;
}
public DerivativeStructure value(DerivativeStructure t) {
// What do I have to do here??
// return what?
}
}
I don't know how to use the DerivativeStructure. What do I have to do,
to get the same functionality like in the the previous function? How can
I define the derivative of my function?
I tried to understand from the user guide, but it wasn't clear for me.
It would be great if someone could give me a hint or further explanation
on this.
Thank you very much in advance!
Best regards,
Franz
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