[ library(eplex) | The ECLiPSe Libraries | Reference Manual | Alphabetic Index ]
# lp_read(+File, ++Format, -Handle)

Read a problem from a file and setup a solver for it.
*File*
- File name
*Format*
- lp or mps
*Handle*
- Returns a handle to the new solver state

## Description

Read a problem from a file and setup a solver for it. Format is
lp or mps. The result is a handle similar to the one obtained by
lp_setup/4. Note that minimisation of the objective is assumed
for mps format, as the sense of the objective is not included in
the mps format. Minimisation is also assumed for external solvers
that ignore the optimisation direction of the lp file (e.g. Xpress).
Note also that although quadratic problems can be read in correctly if
supported by the external solver, the quadratic objective coefficients
are not extracted from the problem by eplex. These coefficients are
used to set/reset the objective when a problem is probed with a
different objective in eplex_probe/2 or lp_probe/3, so the objective
will not be changed or restored correctly in this case.
## See Also

lp_write / 3, lp_setup / 4, eplex_read / 2, eplex_write / 2, lp_probe / 3