[Ipopt] sparse matrix additions

[Rodrigo Lopez-Negrete]

Dear all,

I'm using the C++ interface of Ipopt, and I'm wondering if any of you out
there have suggestions for codes that will allow me to do fast sparse matrix
additions using the triplet format used in Ipopt. I've seen some codes that
use compressed row or column formats, but I'm not using those conventions.
For now, I'm trying to not change my code that much. I need this to add the
Hessian of the objective function with the Hessian of the constraints, among
others.

Any suggestions will be appreciated.

Thanks,
 Rodrigo

-- 

*Rodrigo López-Negrete de la Fuente*
Doctoral Candidate
Email: rln at cmu.edu
WWW: http://rodrigo.lopez-negrete.org

Department of Chemical Engineering
Carnegie Mellon University
5000 Forbes Ave.
Pittsburgh, PA 15213-3890
USA
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