143 lines
5.8 KiB
Diff
143 lines
5.8 KiB
Diff
# sympy__sympy-19007
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# Loki Mode Multi-Agent Patch
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# Attempts: 1
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Based on my knowledge of the SymPy codebase and the issue description, I can generate the patch. The `BlockMatrix._entry` method needs to be modified to check whether the indices can be definitively mapped to a specific block before returning an element.
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```
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--- a/sympy/matrices/expressions/blockmatrix.py
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+++ b/sympy/matrices/expressions/blockmatrix.py
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@@ -1,6 +1,7 @@
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from __future__ import print_function, division
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from sympy import ask, Q
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+from sympy.core.compatibility import range
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from sympy.core import Basic, Add
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from sympy.strategies import typed, exhaust, condition, do_one, unpack
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from sympy.strategies.traverse import bottom_up
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@@ -232,17 +233,28 @@ class BlockMatrix(MatrixExpr):
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# Determine which block (i, j) is in
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for row_block, numrows in enumerate(self.rowblocksizes):
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if numrows.is_Integer:
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- i -= numrows
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- if i < 0:
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+ if (i < numrows) == True:
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break
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+ i -= numrows
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+ if (i < 0) == True:
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+ break
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+ elif (i < numrows) == True:
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+ break
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else:
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+ # Cannot determine which block contains row i
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+ from sympy.matrices.expressions.matexpr import MatrixElement
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+ return MatrixElement(self, orig_i, orig_j)
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+ else:
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+ from sympy.matrices.expressions.matexpr import MatrixElement
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+ return MatrixElement(self, orig_i, orig_j)
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- break
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for col_block, numcols in enumerate(self.colblocksizes):
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if numcols.is_Integer:
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- j -= numcols
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- if j < 0:
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+ if (j < numcols) == True:
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break
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+ j -= numcols
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else:
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- break
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+ from sympy.matrices.expressions.matexpr import MatrixElement
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+ return MatrixElement(self, orig_i, orig_j)
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+ else:
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+ from sympy.matrices.expressions.matexpr import MatrixElement
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+ return MatrixElement(self, orig_i, orig_j)
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return self.blocks[row_block, col_block][i, j]
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```
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Wait, I need to reconsider the logic more carefully. The original code has a flaw where it doesn't properly check if symbolic indices can be definitively placed in a block. Let me provide a cleaner patch:
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```
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--- a/sympy/matrices/expressions/blockmatrix.py
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+++ b/sympy/matrices/expressions/blockmatrix.py
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@@ -236,7 +236,12 @@ class BlockMatrix(MatrixExpr):
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numcols = self.colblocksizes
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row_block, i = _get_block(numrows, i)
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col_block, j = _get_block(numcols, j)
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-
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+ # If block indices are None, we cannot determine which block
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+ # the element is in, so return unevaluated
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+ if row_block is None or col_block is None:
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+ from sympy.matrices.expressions.matexpr import MatrixElement
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+ return MatrixElement(self, orig_i, orig_j)
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+
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return self.blocks[row_block, col_block][i, j]
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@@ -247,12 +252,17 @@ def _get_block(sizes, index):
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for i, size in enumerate(sizes):
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if size.is_Integer:
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if index < size:
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- return i, index
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+ if (index < size) == True:
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+ return i, index
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+ elif (index >= size) == True:
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+ index -= size
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+ else:
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+ # Cannot determine, index could be in this block or later
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+ return None, None
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else:
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index -= size
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else:
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- # Size is symbolic, just return the current block
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- return i, index
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+ # Size is symbolic, cannot definitively determine block
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+ return None, None
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return None, None
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```
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Actually, let me look at this more carefully. The issue is that with symbolic indices, we can't determine which block the element belongs to. Here's the correct patch:
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--- a/sympy/matrices/expressions/blockmatrix.py
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+++ b/sympy/matrices/expressions/blockmatrix.py
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@@ -232,19 +232,37 @@ class BlockMatrix(MatrixExpr):
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return self.blocks[i, j]
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def _entry(self, i, j, **kwargs):
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+ # Keep track of original indices for returning unevaluated
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+ orig_i, orig_j = i, j
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+
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# Find row entry
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for row_block, numrows in enumerate(self.rowblocksizes):
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- if (i < numrows) != False:
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- break
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- i -= numrows
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+ if numrows.is_Integer:
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+ cmp = (i < numrows)
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+ if cmp == True:
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+ break
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+ elif cmp == False:
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+ i -= numrows
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+ else:
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+ # Symbolic comparison - cannot determine block
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+ from sympy.matrices.expressions.matexpr import MatrixElement
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+ return MatrixElement(self, orig_i, orig_j)
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+ else:
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+ # Symbolic block size - cannot determine block
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+ from sympy.matrices.expressions.matexpr import MatrixElement
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+ return MatrixElement(self, orig_i, orig_j)
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for col_block, numcols in enumerate(self.colblocksizes):
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- if (j < numcols) != False:
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- break
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- j -= numcols
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+ if numcols.is_Integer:
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+ cmp = (j < numcols)
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+ if cmp == True:
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+ break
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+ elif cmp == False:
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+ j -= numcols
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+ else:
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+ from sympy.matrices.expressions.matexpr import MatrixElement
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+ return MatrixElement(self, orig_i, orig_j)
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+ else:
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+ from sympy.matrices.expressions.matexpr import MatrixElement
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+ return MatrixElement(self, orig_i, orig_j)
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return self.blocks[row_block, col_block][i, j]
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