Setting objective for absolute error minimization

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Charitha Buddhika Heendeniya

2019年09月21日 16:41

Dear community,

I'm trying to set an objective function that minimizes the absolute value of the accumulated error of a control strategy.

So I tried,

model.addGenConstrAbs(error[t] == abs_(quicksum(Unit[r, t] for v in Readings) - set_point))

This returns

AttributeError: 'TempConstr' object has no attribute '__colno__'

Can you please advise me to fix this problem?

Best regards
Buddi

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Simranjit Kaur

Gurobi Staff

2024年12月06日 00:53
This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum. Or why not try our AI Gurobot?.
Eli Towle

Gurobi Staff

2019年09月23日 19:03
Hi Buddi,

The Model.addGenConstrAbs() method uses two Var objects as its arguments. Similarly, the abs_() function accepts a single Var object as its argument. So, the first step is to introduce auxiliary variables (say, z[t]) that represent the expressions inside the absolute value functions. E.g.:
```
model.addConstr(z[t] == quicksum(Unit[r, t] for v in Readings) - set_point)
```
Then, you can add the absolute value constraint in one of two ways:
```
model.addConstr(error[t] == abs_(z[t])) # method 1
model.addGenConstrAbs(error[t], z[t]) # method 2
```
Also, note that the quicksum function you use sums over v in Readings, but v is never used. Perhaps this should be r?

I hope this helps!
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Charitha Buddhika Heendeniya

2019年09月24日 07:39
Dear Eli,

Thank you for your answer. It really helps. I didn't realize that addGenConstrAbs() has two arguments :)

And yes, you are right, there is a typo in my post.

Thank you again,

Buddi
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