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# 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