[jira] [Commented] (MATH-571) make FieldVector generic

["Luc Maisonobe (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MATH-571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13030839#comment-13030839 ] 

Luc Maisonobe commented on MATH-571:
------------------------------------

I am not sure to understand what you mean. Do you want to add the second R parameter for the sake of implementing a copy method ?

The current way of copying a vector would be to use
{code}
ArrayComplexVector v = new ArrayComplexVector();
ArrayComplexVector v1 = new ArrayComplexVector(v);
{code}

Can you explain further what you need ?
Thanks

> make FieldVector generic
> ------------------------
>
>                 Key: MATH-571
>                 URL: https://issues.apache.org/jira/browse/MATH-571
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 3.0
>            Reporter: Arne Plöse
>            Priority: Minor
>
> make FieldVector generic, so one can extend i.e. ArrayVieldVector<Complex> to ArrayComplexVector an introduce new methoids (getReal())...
> if one has an equation complexvector.copy the original type ArrayComplexVector is lost thus access to getReal() is not possible.
> solution:
> public class InheritationTest {
>     public static interface FieldVector<T extends FieldElement<T>, R extends FieldVector> {
>         R copy();
>     }
>     public abstract static class ArrayFieldVectorExtendable<T extends FieldElement<T>, R extends FieldVector> implements FieldVector<T, R>, Serializable {
>         protected T[] data;
>         @Override
>         public R copy() {
>             return createVector(data);
>         }
>         abstract protected R createVector(T[] data);
>     }
>     public static class ArrayFieldVector<T extends FieldElement<T>> extends ArrayFieldVectorExtendable<T, ArrayFieldVector> {
>         @Override
>         protected ArrayFieldVector<T> createVector(T[] data) {
>             ArrayFieldVector<T> result = new ArrayFieldVector<T>();
>             result.data = data;
>             return result;
>         }
>     }
>     public static class ArrayComplexVector extends ArrayFieldVectorExtendable<Complex, ArrayComplexVector> {
>         @Override
>         protected ArrayComplexVector createVector(Complex[] data) {
>             ArrayComplexVector result = new ArrayComplexVector();
>             result.data = data;
>             return result;
>         }
>         public double[] getReal() {
>             return null;
>         }
>         public double[] getImaginary() {
>             return null;
>         }
>     }
>     public void test() {
>         ArrayComplexVector v = new ArrayComplexVector();
>         ArrayComplexVector v1 = v.copy();  // FiledVector type survives ...
>     }
> }

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