Quadratic function: follow the herd?

[bchretien]

QP solvers usually describe quadratic functions as:

f(x) = 0.5 x^T H x + x^T g + λ

but in RobOptim, GenericNumericQuadraticFunction considers:

f(x) = x^T A x + x^T b + c

Thus, we have H = 2 A, which may be a source of error for users used to traditional QP solvers.