[Ipopt] Would it be possible / useful to use a sparse gradient in Ipopt ?

[Pierre Martinon]

Hi everyone,

The question is simple: Ipopt uses a sparse format for the jacobian 
matrix of the constraints.
On the other hand, the gradient of the objective is a standard array.
I happen to have extremely sparse gradients in my applications, 
typically less than 10
non-zeros elements for a size of several thousands.
Would it make sense to use a sparse gradient in this case ?

Best regards,
Pierre

-- 
Pierre Martinon
Inria and Ecole Polytechnique
www.cmap.polytechnique.fr/~martinon