the function behaves ok when additional contraints arent provided to
it but throws an error when I provide constraints. The error is thrown
even when I am sure the constraints could be satisfied.

[PortRisk, PortReturn, PortWts] = portopt (ExpReturn,
ExpCovariance,20,[],conset) 
gives the following error
----------------------------------------------------------
??? Error using ==> portopt
No portfolios satisfy all the input constraints

Error in ==> test_portopt at 41
[PortRisk, PortReturn, PortWts] = portopt (ExpReturn,
ExpCovariance,20,[],conset)
----------------------------------------------------------

[PortRisk, PortReturn, PortWts] = portopt (ExpReturn,
ExpCovariance,20,[],[]) this function call without constraints behaves
fine.

Has anyone had similar problems with portopt?  Could you tell me where
I may be going wrong.