Hi, While fixing MATH-406, I had to introduce two quantities: wjacobian and wresiduals corresponding to the weighted Jacobian of the residuals and the weighted residuals respectively. I had to do this because the field names are somehow misleading. For instance, the field 'jacobian' has two different meanings: - in DifferentiableMultivariateVectorialFunction, the Jacobian is the matrix of the gradients of the function. - in AbstractLeastSquaresOptimizer, the Jacobian is the matrix of the gradients of the weighted residuals. To reduce the confusion for the potential contributors, it might be wise to avoid to use the same name for the two quantities. The field jacobian from AbstractLeastSquaresOptimizer might be renamed weightedResidualsJacobian to remind what its content is.
The same is potentially true for the residuals. I needed a weighted version so I added wresiduals. However, from what I see in the rest of the code, there is no accessor to the residuals per se. So, one could drop residuals and only keep weightedResiduals. Does anybody think of a situation where the Jabonian of the model (i.e. without the weight and the sign change) would be useful and should therefore be kept separately? Same question about the genuine residuals (i.e. unweighted). Otherwise, I would drop the two unweighted fields. Regards, Dim. ---------------------------------------------------------------------------- Dimitri Pourbaix * Institut d'Astronomie et d'Astrophysique * Don't worry, be happy CP 226, office 2.N4.211, building NO * and CARPE DIEM. Universite Libre de Bruxelles * Boulevard du Triomphe * Tel : +32-2-650.35.71 B-1050 Bruxelles * Fax : +32-2-650.42.26 http://sb9.astro.ulb.ac.be/~pourbaix * mailto:pourb...@astro.ulb.ac.be --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
