Open sdementen opened 2 years ago
I believe this is a documented limitation. On Friday, January 28, 2022, 05:08:03 AM PST, sdementen @.***> wrote:
When multiplying by a constant before or after a variable.sum() I get a wrong / good answer from cylp.cy.CyClpSimplex import CyClpSimplex
s = CyClpSimplex() x = s.addVariable("x", 2) y = s.addVariable("y", 2) s += y >= 0 s += y.sum() - x.sum() * 3 <= -1 # ==> gives wrong solution x=[0,1]
s.objective = x.sum() s.primal() The two expressions y.sum() - x.sum() 3 <= -1 and y.sum() - 3 x.sum() <= -1 should represent the same constraint and give the same results but only the second gives the correct model.
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When multiplying by a constant before or after a variable.sum() I get a wrong / good answer
The two expressions
y.sum() - x.sum() * 3 <= -1
andy.sum() - 3 * x.sum() <= -1
should represent the same constraint and give the same results but only the second gives the correct model.