Originally posted by: ILOVEIBMandCPLEX

Dear all,

I am using the Cplex12.5 and Matlab R2010a. When I use the function Cplexbilp( ) to call the cplex from matlab, the information goes to screen (command window of the matlab) , does not go to the file cplex.log by default.  How can I get the log file? which parameter do I need to set ? and how to set ?

The method of calling the cplex from matlab is as follows:

options = cplexoptimser('cplex');

options.diagnostics = 'on' ;

options.Display = 5;

options.NodeDisplayInterval = 20;

options.logfile =1;

[x, fval, exitflag, output] = cplexlp( f, Aineq, bineq, Aeq, beq, LB, UB, [], options );

Thanks for your answers in advance. 

Best regards,

Huizhen

Redirecting output (the log) is only possible with the class API. With the class API you can do

function mydisp(msg)
    disp(msg);
end

...

cplex = Cplex();
cplex.DisplayFunc = @mydisp;
% Initialize the fields lhs, rhs, A, sense, obj, lb, ub, of cplex.Model (see also here)
cplex.solve();

With this all output is routed through function mydisp and you can do whatever you like with the messages.