Questions tagged [pulp]
Questions relevant to the PuLP modelling framework in Python
15
questions with no upvoted or accepted answers
7
votes
0
answers
156
views
Why does PuLP call copy for addition and how can I avoid it?
Using a for loop to append terms to an expression seems to be much faster than summing a group of terms all at once. Constructing the expression using a for loop uses __iadd__, which does not include ...
- 261
3
votes
0
answers
98
views
PuLP Python: How to linearize an inequality involving an integer variable
I am working on a Copper payables problem where the objective function is to maximise the sum of copper payable over a time period, T.
The total amount of payable tonnes i.e. what the customer will ...
- 327
3
votes
0
answers
959
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How can I see the engine log when solving a LP using pulp (python)?
I wonder which command should I use to see how the steps the pulp solver is doing when solving a linear program.
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3
votes
0
answers
106
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Constraint equivalence in PuLP
I'm working on an optimization problem in PuLP and I have to enforce a daily minimum of shifts and a daily maximum of assigned shifts. I have the following constraints to ensure each day has a minimum ...
- 101
2
votes
0
answers
135
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Seeking help in pulp scheduling problem
I have successfully implemented a program where I allocate N truck drivers to M gathering hubs for each one of the days of the ...
- 153
1
vote
0
answers
305
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Problem of optimal solution generated with Pulp
I'm trying to use Pulp to solve VRP problem. Here is the model:
...
- 129
1
vote
0
answers
172
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Profit Optimization in Python with Difficult Constraints to Maximize Net Revenue
I am currently trying to work on this problem that determines the best constraints on how to place these 'bids'- please see the second column in the screenshot:
The ask at hand is to uncover a model ...
- 11
1
vote
0
answers
135
views
Resource constrained LP problem
I am working on Diet Allocation problem. Where we need to provide food piece for protein deficiency. The data is as below:
...
- 19
0
votes
0
answers
35
views
Binary variable taking floating values in multi trip VRP with TW
I am trying to solve a multi trip VRP with time windows in pulp (minimizing total distance travelled). The code is providing optimal results for multi trip VRP without time window constraints (however ...
- 1
0
votes
0
answers
58
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Need help for the python scheduling code
I'm working on a Python application using PuLP for optimization, and I'm having trouble ensuring that only one material is produced on a given day.
The constraint prob += pulp.lpSum(production_flag[m][...
0
votes
0
answers
33
views
Shipment Allocation using Pulp
I am trying to create a model where each shipment must be allocated to a route to minimize the freight cost. I am a complete newbie at LP Optimization.
Explanation of dataset:
Every destination (D1,...
0
votes
2
answers
117
views
Extracting a sequence as a decision variable from a matrix (PuLP)
I am solving a sequencing problem x[i][j], i.e. a binary matrix indicating that product i is followed by ...
- 19
0
votes
1
answer
108
views
Ensure complete cycle in binary succession matrix LP [PuLP]
I have a set of orders N, for which i have to determine an optimal sequence. I wrap this decision within a binary matrix x[i][j], meaning whether i is succeeded by j.
For example
[[0 1 0 0]
[0 0 1 0]
[...
0
votes
0
answers
194
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Detect presolve status in pulp model
I am running a model using pulp CBC and have few constraints in the model that may make the model infeasible if wrong input is given to the model.
I can see while my model runs that in case of ...
0
votes
1
answer
73
views
Issue with Mathematical Model Using PuLP Library
I'm working on a pulp python code for the MS-RCPSP (multi-skilled resource-constrained project scheduling problem), I need to update the code to address a specific scenario: when an activity requires ...
- 21