Reference to non-existent field 'computeIIS'.

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Azam Boskabadi 2019-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/443428-reference-to-non-existent-field-computeiis

编辑： Walter Roberson 2019-2-6

Hi, Im trying to code a big Mixed Integer Problem by calling Gurobi from Matlab. It seems that the problem is infeasible, so I tried to use computeIIS as it is shown here:

http://www.gurobi.com/documentation/8.1/refman/py_model_computeiis.html

but I get the following error when I run my code:

Reference to non-existent field 'computeIIS'.

The Function that calls Gurobi in Matlab is as follows:

function mip1_P_F()

load('mip1_P.mat');

model.A = sparse(A);

model.obj = Obj;

model.rhs = B ;

model.sense = Signs;

model.lb = LB;

model.ub = UB;

model.vtype = VT;

model.modelsense = 'max';

model.varnames = names;

gurobi_write(model, 'mip1_P.lp');

params.outputflag = 0;

result = gurobi(model, params);

disp(result);

model.computeIIS();

for v=1:length(names)

fprintf('%s %d\n', names{v}, result.x(v));

end

fprintf('Obj: %e\n', result.objval);

end

Im not sure what is wrong, Ill appreciate your help!!!

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Walter Roberson 2019-2-6

编辑：Walter Roberson 2019-2-6

Does model exist within that mat file that you are loading ? You should avoid poofing variables into existence as MATLAB is permitted to assume at parse time that the structure assignment to model have nothing to do with the load.

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