sympy__sympy-12454
Based on the issue description, I can understand the problem clearly and provide a fix. The issue is in sympy/matrices/matrices.py in the is_upper method. The code iterates over indices that go beyond the matrix dimensions for tall…
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Based on the issue description, I can understand the problem clearly and provide a fix. The issue is in `sympy/matrices/matrices.py` in the `is_upper` method. The code iterates over indices that go beyond the matrix dimensions for tall matrices (more rows than columns).
The current code:
```python
return all(self[i, j].is_zero
for i in range(1, self.rows)
for j in range(i))
```
For a 4x2 matrix, this generates indices including (3, 2) which is out of bounds since the matrix only has 2 columns (indices 0 and 1).
The fix should limit `j` to be less than both `i` and `sel
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