Documentation

Example

Example

Let us now turn our attention to an example of using Gurobi to solve a simple MIP model. Our example optimizes the following model:

maximize x + y + 2 z    
subject to x + 2 y + 3 z $\leq$ 4
  x + y     $\geq$ 1
  x, y, z binary  
Note that this is the same model that was modeled and optimized in the C Interface section.

This is the complete source code for our example (also available in <installdir>/examples/matlab/mip1.m)...


function mip1()
% Copyright 2019, Gurobi Optimization, LLC
% This example formulates and solves the following simple MIP model:
%  maximize
%        x +   y + 2 z
%  subject to
%        x + 2 y + 3 z <= 4
%        x +   y       >= 1
%        x, y, z binary

names = {'x'; 'y'; 'z'};

model.A = sparse([1 2 3; 1 1 0]);
model.obj = [1 1 2];
model.rhs = [4; 1];
model.sense = '<>';
model.vtype = 'B';
model.modelsense = 'max';
model.varnames = names;

gurobi_write(model, 'mip1.lp');

params.outputflag = 0;

result = gurobi(model, params);

disp(result);

for v=1:length(names)
    fprintf('%s %d\n', names{v}, result.x(v));
end

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