dirkschumacher / ompr

R package to model Mixed Integer Linear Programs

https://dirkschumacher.github.io/ompr/

dirkschumacher/ompr Issues

add dependency matrix to constrains
Updated 19 days ago19
Feature Request: adding "macro" functionality to ompr
Updated 8 months ago1
How write a constraint once there is a variable used as the index?
Closed 8 months ago2
Request Feature: Add Vectorized semantics revisited of MILPModel to MIPModel
Updated 10 months ago
interactions: "Quadratic expression are not supported"
Updated a year ago3
Limiting Variable Definition By Ordered Pair
Closed a year ago9
Sparse Matrix Constraints with multi-index
Updated a year ago
Again, my curious interest is in pre-processing sparse data objects outside of MIPModel if possible. I created a simple sparse supply chain dataframe as an example:
Closed a year ago
the cannery problem - vignette enhancement
Updated 2 years ago
Getting error "*.AbstractLinearFunction" when multiplying in objective function
Closed 2 years ago1
Release ompr 1.0.3
Closed 2 years ago
Semi continuous variable
Updated 2 years ago7
Feature Request Integrated with RAMPL
Updated 2 years ago1
Object not found
Closed 2 years ago3
Error in add_variable, object not found
Closed 2 years ago1
Feature Request: GAMS presolver for ompr
Updated 2 years ago1
NEOS Server & Async Mode: Error: object of type 'closure' is not subsettable
Closed 2 years ago
Solver log not showing up anymore
Updated 2 years ago
Binary variable <= Binary matrix: Error in constraint$lhs - constraint$rhs : non-numeric argument to binary operator
Updated 2 years ago4
Implement Quadratic Constraints/Objectives
Updated 2 years ago1
Gurobi Solver- Recent Experience?
Closed 2 years ago1
"Error: You have definied variables for 1 rows, but you add a constant with N elements"
Closed 2 years ago1
Error Code "Error: object 'x' not found"
Updated 2 years ago4
Define/Use Sparse Matrices
Closed 2 years ago1
inequalities evaluated to true/false at build time should still be passed to the solver
Updated 2 years ago
Error in `multiply.LinearTerm()`: ! Quadratic expression are not supported
Closed 2 years ago5
Error in MIPModel construction without %>% piping
Closed 2 years ago1
Variable not found for indexes error
Closed 2 years ago10
Release ompr 1.0.2
Closed 2 years ago1
Solution ordering in R 3.x
Closed 2 years ago2
Investigate the use of S3 double dispatch for algebra
Closed 2 years ago
Release ompr 1.0.0
Closed 2 years ago
Problem with reverse import OTrecod
Closed 2 years ago
Error in ompr::new_solution
Closed 2 years ago3
get_solutions needs to support rlang
Closed 2 years ago
Request regarding index
Updated 2 years ago2
How to set_bounds for a vector of bounds?
Closed 2 years ago3
Relicense to MIT
Closed 2 years ago3
Error in [[: subscript out of bounds
Closed 2 years ago2
mymodel not found
Closed 2 years ago8
Using index "e" fails in sum_expr
Closed 2 years ago2
Adding a constraint using sum_expr and an index that is dependent on outside variables.
Closed 2 years ago
ompr::add_constraint(.): Adding a simple char-constraint (?), ERROR: The expression contains a variable that is not part of the model
Closed 2 years ago2
Found: workaround for array multiplication in constraints & objfcn using MILPModel
Closed 2 years ago1
Multiple Knapsack problem
Closed 3 years ago3
There are variables in your environment that interfere with your defined model variables: x. This can lead to unexpected
Closed 3 years ago3
MILPModel: constraint matrix * variable vector - revisited
Updated 3 years ago5
Check Matrix and R-devel compatibility
Closed 3 years ago8
ROIoptimze development discussion space?
Closed 3 years ago1
add_constraint with Lead/Lag variables
Closed 3 years ago2