# Extract the constraint matrix, the right hand side and the sense from a model

Source:`R/model-api.R`

`extract_constraints.Rd`

Extract the constraint matrix, the right hand side and the sense from a model

## Value

a list with three named elements. 'matrix' the (sparse) constraint matrix from the Matrix package. 'rhs' is the right hand side vector in the order of the matrix. 'sense' is a vector of the constraint senses

## Examples

```
library(magrittr)
model <- MIPModel() %>%
add_variable(x[i], i = 1:3) %>%
add_variable(y[i], i = 1:3) %>%
add_constraint(x[i] + y[i] <= 1, i = 1:3)
extract_constraints(model)
#> $matrix
#> 3 x 6 sparse Matrix of class "dgCMatrix"
#>
#> [1,] 1 . . 1 . .
#> [2,] . 1 . . 1 .
#> [3,] . . 1 . . 1
#>
#> $sense
#> [1] "<=" "<=" "<="
#>
#> $rhs
#> [1] 1 1 1
#>
```