[Clp] Performance Issue with CoinPackedMatrix

[alexander]

John,

Thank you very much for your fast response.

In the meantime I implemented a version where I use the constructor
creating a packed matrix from triples which is already 10 times faster
than using modifyCoefficient:

http://paste.debian.net/160918/

I'd like to test using ClpSimplex::loadProblem to set up the problem
without ever creating a CoinPackedMatrix myself, but I don't understand
what the "const CoinBigIndex* start" and "const int* index" should be.

Alexander Brock