It may be possible to use the OPF with user-defined variables/constraints to 
solve the problem you have in mind, but you would need to specify the 
formulation of your problem in more detail to be sure. There are examples of 
some simple user-defined extensions to the OPF in the OPF test functions (e.g. 
t/t_opf_mips.m).

-- 
Ray Zimmerman
Senior Research Associate
B30 Warren Hall, Cornell University, Ithaca, NY 14853
phone: (607) 255-9645





On Aug 6, 2013, at 7:27 AM, [email protected] wrote:

> Dear all,
> 
>      I am wondering if it is possible to use opf's user-define variable to 
> calculate lambda in cpf?
>      Such as 
> 
>                  max lambda
>                  F(x, lambda) = 0
> 
>      And where can I find the example of user-define function? It's not that
> helpful by reading the manual. 
> 
>                                                   Regards,
>                                                          LarryHo

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