All Questions
Tagged with linear-programming java
92 questions
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Integer Solver vs ExpressionsBasedModel.minimise()
I am trying to implement an integer solver using Ojalgo across time series data, with only first-order constraints and a linear first-order objective function. All my variables are integers. I am ...
- 3
0
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1
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48
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How to set specific array-constraints with the Google OR-Tools?
At the moment I am trying to solve a specific problem in which employees are voting for advanced training courses from a scale of 1 to 10. Not all courses will be offered and not every employee can ...
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3
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115
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Solving for the closest point within designated area
Trying to wrap my head around a problem I am trying to solve. I can't imagine I'm the first one that has solved something like this. I'm fairly certain its a linear programming problem. I'm working in ...
- 29
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1
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110
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How to get variables values from Optimisation.Result in ojAlgo?
I use ojAlgo lib in version 51.4.1. I ve got:
protected final ExpressionsBasedModel model = new ExpressionsBasedModel();
protected Variable[] result;
and some other variables. Each variable is added ...
- 45
1
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3
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923
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Find min max range of multiple variables the results in maximum PnL
Given a table of N columns, all columns except last are variables and the last column is PnL (Profit and Loss). Each variable value is a whole number (no fractions, decimals) greater than or equals 0 ...
- 31
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1
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67
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Using SCPSolver in Android
I am trying to use SCPSolver in Android project to solve linear programming problem.
I have downloaded the Jar file and added it to the lib folder. Everything works seemingly fine until I invodel the ...
1
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1
answer
3k
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Or-tools java.lang.NoClassDefFoundError: com/sun/jna/Platform
Hi I'm trying to run this sample code on my eclipse ide and have manually adding the jars file without using the pom file provided but it's complaining with this error.
I managed to compile and run ...
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1
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1
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331
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How do one solve linear programming problems with ojAlgo?
I am trying to learn how to solve a linear programming problem and I want to use ojAlgo LinearSolver.
I solve the equality constraints using a SolverTask and get a single feasible point. Nice!
Then I ...
- 35
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177
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Indication warm start infeasible in CPLEX
I'm running LP problem in CPLEX with JAVA API. I'm trying to model a greedy solution by fixing a maximal number of variables until I get a feasible solution.
I use this to fix the variables:
cplex....
user7738429
0
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1
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164
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Using google or-tools in eclipse
I am new to both Eclipse and or-tools.
I have downloaded the binary for or-tools and when I do 'make test_java' (from the terminal), everything runs fine.
However, when I try to use it in eclipse it ...
- 100
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2
answers
116
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Looking for the correct way to use "DoubleValueRange" in OptaPlanner
I am learning about how to use OptaPlanner via solving linear programming. I know there are quite a lot of LP solvers, but I think it's a good start point for me to understand the modeling.
But When I ...
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4
votes
2
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404
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How to find the point that gives the maximum value fast? Java or c++ code please
I need a fast way to find maximum value when intervals are overlapping, unlike finding the point where got overlap the most, there is "order". I would have int[][] data that 2 values in int[]...
- 620
0
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1
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380
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How to clone a cplex object in Java?
I am solving a problem in Java using the CPLEX library. I use a class "Model" to create a CPLEX object, and add to it variables, objective function and multiple constraints. This is the ...
0
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4
answers
3k
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Optimization: Farming wheat and rice
This is the problem statement
An Indian farmer has a piece of farmland, say L square kilometers long, and wants to either sow wheat or rice or a combination of both. The farmer has a limited amount of ...
- 21
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42
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Is lp_solve changing constraints to find a feasible solution?
I use lp_solve Java API to solve a constrained problem, and I have two constraints that would limit the number of selected items in a specified range, such as the following one:
+36 S_1 +31 S_2 +20 ...
