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-rw-r--r--sumofsquares/solver/cvxopt.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sumofsquares/solver/cvxopt.py b/sumofsquares/solver/cvxopt.py
index c4e1db3..7be4e0d 100644
--- a/sumofsquares/solver/cvxopt.py
+++ b/sumofsquares/solver/cvxopt.py
@@ -78,7 +78,7 @@ def solve_sos_cone(prob: Problem, verbose: bool = False,
# cost quadratic term
if is_qp:
- n = len(prob.variables)
+ n = len(variable_indices)
P = np.zeros((n, n))
# This works because of how monomial indices are sorted
# see also polymatrix.index.MonomialIndex.__lt__