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-rw-r--r--polymatrix/expression/mixins/tosortedvariablesmixin.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/polymatrix/expression/mixins/tosortedvariablesmixin.py b/polymatrix/expression/mixins/tosortedvariablesmixin.py
index 490604d..d839ef7 100644
--- a/polymatrix/expression/mixins/tosortedvariablesmixin.py
+++ b/polymatrix/expression/mixins/tosortedvariablesmixin.py
@@ -23,7 +23,7 @@ class ToSortedVariablesMixin(ExpressionBaseMixin):
def gen_sorted_vector():
for row, index in enumerate(sorted(variable_indices)):
- yield (row, 1), {(index, 1): 1}
+ yield (row, 1), {((index, 1),): 1}
poly_matrix = init_poly_matrix(
terms=dict(gen_sorted_vector()),