Names for variables and constraints

[dirkschumacher]

Would be nice to be able to name constraints and variables

[dirkschumacher]

Maybe support the glue syntax?

MIPModel(solver) %>% 
  add_variable(x[i, j], i = 1:10, j = 1:10, name = "x_[{i}, {j}]") %>% 
  set_objective(sum_expr(x[i, j], i = 1:10, j = 1:10)) %>%
  add_constraint(sum_expr(x[i, j], j = 1:i) <= 10, i = 1:10, name = "constr_{i}")

[dirkschumacher]

Probably like this:

model <- MIPModel(solver)
x <- model$add_variable(x[i], type = "binary", i = 1:10, name = "x_[{i}, {j}]")
model$set_objective(sum_expr(v[i] * x[i], i = 1:10), sense = "max")
model$add_constraint(sum_expr(w[i] * x[i], i = 1:10) <= 10, name = "constr_{i}")
model$optimize()

[dirkschumacher]

Note to self: I need to investigage if ROI supports partial variable names