ompr 0.8.0.9000

You can now assign coefficients to all column/row combinations using colwise in the experimental MILPModel backend.
Non-existent indexes in sum_expr now produce a warning instead of an error. The missing indexes will be ignored (#202).

Bugfixes

Fixed a bug were get_solution could return mixed up values when variables had partially similar names (eg: s[i] and bus[i]) by @hugolarzabal (#244).

ompr 0.8.0

General changes

Removed dplyr dependency
Added MILPModel, a new, vectorized backend for mixed integer linear programs that can handle very large models. It will eventually replace MIPModel.
Added two functions (get_column_duals, get_row_duals) to extract the dual (column and row) values from an LP.
The minimum supported R version is now 3.2.0
get_solution now always return a solution, even if the solution status is not optimal.
get_solution has a third argument type with permitted values being "primal" and "dual" to return the respective column primal or dual values.

Bugfixes

You can now extract solutions of indexed variables that have length one (#198)

ompr 0.7.0

Breaking changes

ompr now uses sparse constraint matrices. extract_constraints now returns a sparse matrix and objective_function returns a sparse vector.
The minimum supported R version is now 3.3.0
Fixed an issue with Rcpp. The minimum Rcpp version is now 0.12.12

Minor changes

New progress bar based on the progress package.

ompr 0.6.0

First version on CRAN