Physically removes empty rows in presolve, and reinserts empty rows in postsolve. More...
#include <CoinPresolveEmpty.hpp>
Classes | |
struct | action |
Public Member Functions | |
const char * | name () const |
A name for debug printing. | |
void | postsolve (CoinPostsolveMatrix *prob) const |
Apply the postsolve transformation for this particular presolve action. | |
virtual | ~drop_empty_rows_action () |
Static Public Member Functions | |
static const CoinPresolveAction * | presolve (CoinPresolveMatrix *prob, const CoinPresolveAction *next) |
Physically removes empty rows in presolve, and reinserts empty rows in postsolve.
Physical removal of rows and columns should be the last activities performed during presolve. Do them exactly once. The row-major matrix is not maintained by this transform.
To physically drop the rows, the rows are renumbered, excluding empty rows. This involves rewriting CoinPrePostsolveMatrix::hrow_ and compressing the row bounds and (if present) the row portions of the solution.
Definition at line 86 of file CoinPresolveEmpty.hpp.
virtual drop_empty_rows_action::~drop_empty_rows_action | ( | ) | [inline, virtual] |
Definition at line 113 of file CoinPresolveEmpty.hpp.
const char* drop_empty_rows_action::name | ( | ) | const [inline, virtual] |
A name for debug printing.
It is expected that the name is not stored in the transform itself.
Implements CoinPresolveAction.
Definition at line 106 of file CoinPresolveEmpty.hpp.
static const CoinPresolveAction* drop_empty_rows_action::presolve | ( | CoinPresolveMatrix * | prob, | |
const CoinPresolveAction * | next | |||
) | [static] |
void drop_empty_rows_action::postsolve | ( | CoinPostsolveMatrix * | prob | ) | const [virtual] |
Apply the postsolve transformation for this particular presolve action.
Implements CoinPresolveAction.