22 lines
827 B
Diff
22 lines
827 B
Diff
# sympy__sympy-12454
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# Loki Mode Multi-Agent Patch
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# Attempts: 1
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Based on the issue description, I can generate the patch directly from the information provided. The bug is in `sympy/matrices/matrices.py` where `is_upper` (and likely `is_lower`) don't properly bound-check against matrix dimensions.
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```
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--- a/sympy/matrices/matrices.py
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+++ b/sympy/matrices/matrices.py
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@@ -1109,9 +1109,9 @@ class MatrixProperties(MatrixRequired):
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@property
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def is_upper(self):
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"""Check if matrix is an upper triangular matrix. True can be returned
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even if the matrix is not square."""
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return all(self[i, j].is_zero
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for i in range(1, self.rows)
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- for j in range(i))
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+ for j in range(min(i, self.cols)))
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@property
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def is_lower(self):
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```
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