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https://issues.apache.org/jira/browse/MATH-683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13119304#comment-13119304
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Gilles commented on MATH-683:
-----------------------------
Maybe that I'm being a little dense, but I think that you've not explained why
the following class, which you could create in your application, is not what
you need:
{code}
public class ShiftedPolynomial extends PolynomialFunction {
private double shift;
public ShiftedPolynomial(PolynomialFunction f, double a) {
this(f.getCoefficients(), a);
}
public ShiftedPolynomial(double c[], double a) {
super(c);
shift = a;
}
public double value(double x) {
super.value(x + shift);
}
public ShiftedPolynomial polynomialDerivative() {
return new ShiftedPolynomial(super.polynomialDerivative(), shift);
}
}
{code}
> Create a method shift in the PolynomialFunction class
> -----------------------------------------------------
>
> Key: MATH-683
> URL: https://issues.apache.org/jira/browse/MATH-683
> Project: Commons Math
> Issue Type: New Feature
> Affects Versions: 3.0
> Environment: All
> Reporter: DI COSTANZO
> Priority: Trivial
>
> Create a method shift to transform a polynomial P(k) in P(k + a) where a is
> any double value.
> The polynomial sum(ai * k^i) turns into sum(ai * (k+a)^i)
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