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BUG: small patch to _VarArray while inputting a matrix with length > 1 #1060

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BUG: small patch to _VarArray while inputting a matrix with length > 1 #1060

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36e9066
Fix _VarArray size initialization logic
Zeroto521 Aug 20, 2025
23d4344
Add test for knapsack constraint with matrix variables
Zeroto521 Aug 20, 2025
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4 changes: 2 additions & 2 deletions src/pyscipopt/scip.pxi
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Original file line number Diff line number Diff line change
Expand Up @@ -308,7 +308,7 @@
if rc == SCIP_OKAY:
pass
elif rc == SCIP_ERROR:
raise Exception('SCIP: unspecified error!')

Check failure on line 311 in src/pyscipopt/scip.pxi

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GitHub Actions / test-coverage (3.11) 

SCIP: unspecified error!
elif rc == SCIP_NOMEMORY:
raise MemoryError('SCIP: insufficient memory error!')
elif rc == SCIP_READERROR:
Expand Down Expand Up @@ -2509,8 +2509,8 @@
else:
raise TypeError(f"Expected Variable or list of Variable, got {type(vars)}.")

if vars:
self.size = len(vars)
self.size = len(vars)
if self.size:
self.ptr = <SCIP_VAR**> malloc(self.size * sizeof(SCIP_VAR*))
for i, var in enumerate(vars):
if not isinstance(var, Variable):
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11 changes: 11 additions & 0 deletions tests/test_cons.py
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Expand Up @@ -210,6 +210,17 @@ def test_cons_indicator_with_matrix_binvar():

assert m.isEQ(m.getVal(x), 1)

def test_cons_knapsack_with_matrix_vars():
# test matrix variable vars #1043
m = Model()
vars = m.addMatrixVar(3, vtype="B")
m.addConsKnapsack(vars, [1, 2, 3], 5)

m.setObjective(vars.sum(), "maximize")
m.optimize()

assert (m.getVal(vars) == [0, 1, 1]).all()

@pytest.mark.xfail(
reason="addConsIndicator doesn't behave as expected when binary variable is False. See Issue #717."
)
Expand Down