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make code robust in one of CLP/CBC/GLPK is not used with or-tools

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lperron@google.com
2011-11-03 14:58:42 +00:00
parent 84db2d1eaf
commit d53c5f5faf
2 changed files with 41 additions and 31 deletions
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28
python/linear_programming.py
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@@ -21,9 +21,9 @@ from google.apputils import app
from linear_solver import pywraplp
def RunLinearExampleNaturalLanguageAPI(optimization_problem_type):
def RunLinearExampleAlgebraicAPI(optimization_problem_type):
"""Example of simple linear program with natural language API."""
solver = pywraplp.Solver('RunLinearExampleNaturalLanguageAPI',
solver = pywraplp.Solver('RunLinearExampleAlgebraicAPI',
optimization_problem_type)
infinity = solver.infinity()
# x1, x2 and x3 are continuous non-negative variables.
@@ -107,22 +107,26 @@ def SolveAndPrint(solver, variable_list, constraint_list):
(i, constraint.dual_value(), constraint.activity()))
def RunAllLinearExampleNaturalLanguageAPI():
print '---- Linear programming example with GLPK (natural language API) ----'
RunLinearExampleNaturalLanguageAPI(pywraplp.Solver.GLPK_LINEAR_PROGRAMMING)
print '---- Linear programming example with CLP (natural language API) ----'
RunLinearExampleNaturalLanguageAPI(pywraplp.Solver.CLP_LINEAR_PROGRAMMING)
def RunAllLinearExampleAlgebraicAPI():
if hasattr(pywraplp.Solver, 'GLPK_LINEAR_PROGRAMMING'):
print '---- Linear programming example with GLPK (algebraic API) ----'
RunLinearExampleAlgebraicAPI(pywraplp.Solver.GLPK_LINEAR_PROGRAMMING)
if hasattr(pywraplp.Solver, 'CLP_LINEAR_PROGRAMMING'):
print '---- Linear programming example with CLP (algebraic API) ----'
RunLinearExampleAlgebraicAPI(pywraplp.Solver.CLP_LINEAR_PROGRAMMING)
def RunAllLinearExampleCppStyleAPI():
print '---- Linear programming example with GLPK (C++ style API) ----'
RunLinearExampleCppStyleAPI(pywraplp.Solver.GLPK_LINEAR_PROGRAMMING)
print '---- Linear programming example with CLP (C++ style API) ----'
RunLinearExampleCppStyleAPI(pywraplp.Solver.CLP_LINEAR_PROGRAMMING)
if hasattr(pywraplp.Solver, 'GLPK_LINEAR_PROGRAMMING'):
print '---- Linear programming example with GLPK (C++ style API) ----'
RunLinearExampleCppStyleAPI(pywraplp.Solver.GLPK_LINEAR_PROGRAMMING)
if hasattr(pywraplp.Solver, 'CLP_LINEAR_PROGRAMMING'):
print '---- Linear programming example with CLP (C++ style API) ----'
RunLinearExampleCppStyleAPI(pywraplp.Solver.CLP_LINEAR_PROGRAMMING)
def main(unused_argv):
RunAllLinearExampleNaturalLanguageAPI()
RunAllLinearExampleAlgebraicAPI()
RunAllLinearExampleCppStyleAPI()