Regards 
I'm working with tho OPF in MATPOWER, and i wanted to know which is the model 
of costs that the program uses. I need the information to be able to compare 
results with other simulators, because of it I must have very well definite 
each datum of the information to using. 
1. Looking at the information of the system of 9 Nodes; I find the following 
information of costs for the system:
%% generator cost data% 1       startup shutdown        n       x1      y1      
...     xn      yn%     2       startup shutdown        n       c(n-1)  ...     
c0mpc.gencost = [       2       1500    0       3       0.11    5       150;    
2       2000    0       3       0.085   1.2     600;    2       3000    0       
3       0.1225  1       335;];
What kind of cost model this information refers?
2. In the page says that by default the objective function of the system is the 
minimization of costs, this objective function can be changed for others, e.g. 
minimize losses MVAR?
I appreciate the information you can give me.
                                          

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