Gurobi/Python: set as an element of a list

Question

I have an optimization problem, which im trying to solve with the help of gurobi/python.

Some of the constraints have to be summed up over different sets depending on other indicies, eg:

for i in range(nJobs):
        for j in range(n[i]):
            model.addConstr(quicksum(y[i][j][k][l] for k in range(nJobs) for l in range(nJobs)))

In the constraint above sets M[i][j] and W[i][j] depend on the indices i and j.

Those sets are imported from Excel:

M = [[0]* n[i] for i in range(nJobs)]
    iter_i = 0
    for i in range(nJobs):
        if i != 0:
            iter_i = iter_i+n[i-1]
        for j in range(n[i]):
            M[i][j] = DataSheet.cell(5 + j + iter_i, 5).value

The Excel table with the values for M[i][j] looks like this:

So some cells might include multiple numbers separated by the comma.

Obviously the constraints can not be summed up over some of the entries of M[i][j] since those are considered as strings. Is there any way to convert the entries in M[i][j], so those can be used for the summation in the constraints?

Answer 1

You should perform some data cleaning before building the model. The values from the Excel table can be converted from str to int or float using int(value) or float(value) . A single cell in the table should not contain multiple values - this is bad practice and can easily be misinterpreted.

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