189 lines
8.7 KiB
Diff
189 lines
8.7 KiB
Diff
# sympy__sympy-14308
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# Loki Mode Multi-Agent Patch
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# Attempts: 1
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Based on my knowledge of sympy's codebase and the bug description, I can generate the patch. The issue is in the pretty printer's handling of `BasisDependent` multiplication (vector multiplication). The problem is that when pretty printing a `VectorMul` expression like `(x/y)**t * e.j`, the vector's basis component is being incorrectly included in the scalar part's rendering.
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Looking at the sympy codebase structure, the relevant method is `_print_BasisDependent` in `sympy/printing/pretty/pretty.py`. The bug occurs because when building the pretty form for scalar-vector multiplication, the code incorrectly handles the parenthesization - it includes the vector unit inside the parentheses when it should only be for the scalar coefficient.
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Here's the patch:
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```
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--- a/sympy/printing/pretty/pretty.py
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+++ b/sympy/printing/pretty/pretty.py
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@@ -565,19 +565,21 @@ class PrettyPrinter(Printer):
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pform = self._print(googol)
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return pform
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- pform = self._print(googol)
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- pform = prettyForm(*pform.right(googol_sym))
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- pforms.append(pform)
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+ pform_googol = self._print(googol)
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+ pform_googol = prettyForm(*pform_googol.right(googol_sym))
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+ pforms.append(pform_googol)
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pform = prettyForm.__add__(*pforms)
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+ kwargs["root"] = None
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pform = prettyForm(*pform.parens(left='(', right=')'))
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return pform
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def _print_BasisDependent(self, expr):
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from sympy.vector import Vector
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+ # Check if this is a zero vector
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if not self._use_unicode:
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- raise NotImplementedError("ASCII pretty printing of BasisDependent is not implemented")
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+ raise NotImplementedError("ASCII printing not supported for BasisDependent")
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if expr == expr.zero:
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return prettyForm(expr.zero._pretty_form)
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@@ -591,7 +593,8 @@ class PrettyPrinter(Printer):
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for i, v in enumerate(items):
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for j in 0, 1:
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# if the coef of the basis vector is 1, we skip printing it
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- if v[2*j] == 1:
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+ if v[2*j] == S.One:
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+ vec_pform = self._print(v[2*j+1])
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items[i][2*j] = 1
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# if the coef of the basis vector is -1, we skip printing it
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elif v[2*j] == -1:
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@@ -604,24 +607,25 @@ class PrettyPrinter(Printer):
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for j, v in enumerate(items):
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# If the basis vector coeff is -1, we skip the 1
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if v[0] == -1:
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- pform = self._print(v[1])
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- pform = prettyForm(*pform.left(" - "))
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+ vec_pform = self._print(v[1])
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+ pform = prettyForm(*vec_pform.left(" - "))
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elif v[0] == 1:
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# If the basis vector coeff is 1, we skip the 1
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- pform = self._print(v[1])
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+ vec_pform = self._print(v[1])
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if j > 0:
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- pform = prettyForm(*pform.left(" + "))
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+ pform = prettyForm(*vec_pform.left(" + "))
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+ else:
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+ pform = vec_pform
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else:
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- pform = self._print(v[0])
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- pform = prettyForm(*pform.right(" ", self._print(v[1])))
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+ scalar_pform = self._print(v[0])
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+ vec_pform = self._print(v[1])
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+ pform = prettyForm(*scalar_pform.right(" ", vec_pform))
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if j > 0:
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pform = prettyForm(*pform.left(" + "))
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- pforms.append(pform)
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+ if pform is not None:
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+ pforms.append(pform)
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- pform = prettyForm.__add__(*pforms)
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+ return prettyForm.__add__(*pforms)
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else:
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# For single component vectors
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@@ -629,18 +633,21 @@ class PrettyPrinter(Printer):
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coeff, basis = i
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if coeff == 1:
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pform = self._print(basis)
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+ elif coeff == -1:
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+ pform = self._print(basis)
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+ pform = prettyForm(*pform.left("-"))
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else:
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- pform = self._print(coeff)
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- pform = prettyForm(*pform.right(" ", self._print(basis)))
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- pforms.append(pform)
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+ scalar_pform = self._print(coeff)
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+ basis_pform = self._print(basis)
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+ pform = prettyForm(*scalar_pform.right(" ", basis_pform))
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+ if pform is not None:
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+ pforms.append(pform)
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return prettyForm.__add__(*pforms)
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-
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- return pform
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```
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Wait, I need to look at the actual implementation more carefully. The issue described shows that `e_j` appears both inside and outside the parentheses. This suggests the problem is specifically in how `_print_BasisDependent` handles the scalar coefficient - it's calling `self._print()` on a compound expression that includes the vector basis, causing double printing.
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Let me generate a more targeted patch based on the actual bug behavior:
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--- a/sympy/printing/pretty/pretty.py
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+++ b/sympy/printing/pretty/pretty.py
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@@ -565,13 +565,16 @@ class PrettyPrinter(Printer):
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from sympy.vector import BasisDependent
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if isinstance(googol, BasisDependent):
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pform = self._print(googol)
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return pform
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- pform = self._print(googol)
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- pform = prettyForm(*pform.right(googol_sym))
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+ scalar_pform = self._print(googol)
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+ # Center the baseline for proper vertical alignment
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+ scalar_pform.baseline = scalar_pform.height() // 2
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+ pform = prettyForm(*scalar_pform.right(googol_sym))
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pforms.append(pform)
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pform = prettyForm.__add__(*pforms)
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+ pform.baseline = pform.height() // 2
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pform = prettyForm(*pform.parens(left='(', right=')'))
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return pform
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@@ -591,26 +594,30 @@ class PrettyPrinter(Printer):
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for i, v in enumerate(items):
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for j in 0, 1:
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# if the coef of the basis vector is 1, we skip printing it
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- if v[2*j] == 1:
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+ if v[2*j] == S.One:
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items[i][2*j] = 1
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# if the coef of the basis vector is -1, we skip printing it
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- elif v[2*j] == -1:
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+ elif v[2*j] == S.NegativeOne:
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items[i][2*j] = -1
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pforms = []
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+ pform = None
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for j, v in enumerate(items):
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# If the basis vector coeff is -1, we skip the 1
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if v[0] == -1:
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- pform = self._print(v[1])
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- pform = prettyForm(*pform.left(" - "))
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+ basis_pform = self._print(v[1])
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+ pform = prettyForm(*basis_pform.left(" - "))
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elif v[0] == 1:
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# If the basis vector coeff is 1, we skip the 1
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- pform = self._print(v[1])
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+ basis_pform = self._print(v[1])
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if j > 0:
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- pform = prettyForm(*pform.left(" + "))
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+ pform = prettyForm(*basis_pform.left(" + "))
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+ else:
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+ pform = basis_pform
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else:
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- pform = self._print(v[0])
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- pform = prettyForm(*pform.right(" ", self._print(v[1])))
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+ scalar_pform = self._print(v[0])
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+ basis_pform = self._print(v[1])
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+ pform = prettyForm(*scalar_pform.right(" ", basis_pform))
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if j > 0:
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pform = prettyForm(*pform.left(" + "))
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@@ -627,11 +634,14 @@ class PrettyPrinter(Printer):
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for i in o1:
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coeff, basis = i
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if coeff == 1:
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- pform = self._print(basis)
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+ basis_pform = self._print(basis)
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+ pform = basis_pform
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+ elif coeff == -1:
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+ basis_pform = self._print(basis)
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+ pform = prettyForm(*basis_pform.left("-"))
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else:
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- pform = self._print(coeff)
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- pform = prettyForm(*pform.right(" ", self._print(basis)))
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+ scalar_pform = self._print(coeff)
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+ basis_pform = self._print(basis)
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+ pform = prettyForm(*scalar_pform.right(" ", basis_pform))
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pforms.append(pform)
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return prettyForm.__add__(*pforms)
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