[Clp] Need help in OsiClpSimplexInterface:: Pivot()

[SIAMAK MORADI]

Hi 

I am trying to solve bi-objective Linear problems using
OsiClpSimplexInterface, so I need to manually call the Pivot() function. 
I have two problems using this method :

	* I
don’t know when I need to disable and enable the factorization? Right now I use
it every time before the pivot() function but it’s expensive for me.
	* Also in some examples I get the following error:Assertion Failed :  eq(solution_[sequenceOut_],
lowerOut_), file...\clpsimplex.cpp, Line7813
 I would be so pleased if you
could help me with these problems.
Regards
Siamak 
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