set_bounds function

Set the bounds of a variable

Change the lower and upper bounds of a named variable, indexed variable or a group of variables.

set_bounds(.model, .variable, ..., lb = NULL, ub = NULL)

set_bounds_(.model, .variable, ..., lb = NULL, ub = NULL, .dots)

Arguments

• .model: the model

• .variable: the variable name/definition or a linear constraint

• ...: quantifiers for the indexed variable

• lb: the lower bound of the variable.

• ub: the upper bound of the variable

  For MIPModel you can also pass (in)equalities to define bounds. Please look at the examples.

• .dots: Used to work around non-standard evaluation.

Examples

library(magrittr)
MIPModel() %>%
  add_variable(x[i], i = 1:5) %>%
  add_constraint(x[i] >= 1, i = 1:5) %>% # creates 5 constraints
  set_bounds(x[i], lb = 3, i = 1:3) %>%
  variable_bounds()

MIPModel() %>%
  add_variable(x[i], i = 1:5) %>%
  set_bounds(x[i] <= i, i = 1:5) %>% # upper bound
  set_bounds(x[i] >= 0, i = 1:5) %>% # lower bound
  set_bounds(x[5] == 45) %>%
  variable_bounds()