Hi Sébastien.
>
> /**
> * Gauss-Newton least-squares solver.
> @@ -146,8 +148,13 @@ public class GaussNewtonOptimizer extend
> DecompositionSolver solver = useLU ?
> new LUDecompositionImpl(mA).getSolver() :
> new QRDecompositionImpl(mA).getSolver();
> - final double[] dX = solver.solve(b);
> -
> + final RealVector dummy = solver.solve(new ArrayRealVector(b,
> false));
> + final double[] dX;
> + if (dummy instanceof ArrayRealVector){
> + dX = ((ArrayRealVector) dummy).getDataRef();
> + }else{
> + dX = dummy.getData();
> + }
In my opinion, the hypothetical efficiency gain is not worth the convoluted
code so:
---
final double[] dX = solver.solve(new ArrayRealVector(b, false)).toArray();
---
Also, next time, when you'll really need a curly bracket ;-), please insert
a space character before it, and around keywords too:
---
if (ok) {
// ...
} else {
// ...
}
---
Sorry to be picky and thank you,
Gilles
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