152 lines
6.1 KiB
Diff
152 lines
6.1 KiB
Diff
# sympy__sympy-11897
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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 issue description, I can generate the patch. The issue is that:
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1. `exp(-x)*log(x)` renders as `1/e^x * log(x)` in LaTeX but as `e^(-x)*log(x)` in pretty printer
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2. `1/(x+y)/2` renders as `1/(2x+2y)` in LaTeX but as `1/(2*(x+y))` in pretty printer
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The fix requires modifying the `_print_Mul` method in `sympy/printing/latex.py` to:
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1. Not convert negative exponents to fractions (keep `e^{-x}` instead of `\frac{1}{e^x}`)
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2. Not distribute denominators when printing (keep `2(x+y)` grouped in denominator)
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```
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--- a/sympy/printing/latex.py
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+++ b/sympy/printing/latex.py
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@@ -414,7 +414,8 @@ def _print_Mul(self, expr):
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from sympy.core.power import Pow
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from sympy.physics.units import Quantity
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include_parens = False
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- if _coeff_isneg(expr):
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+ # Check if the expression has a negative coefficient
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+ if expr.could_extract_minus_sign():
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expr = -expr
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tex = "- "
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if expr.is_Add:
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@@ -432,26 +433,42 @@ def _print_Mul(self, expr):
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numer, denom = fraction(expr, exact=True)
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+ # Get the original separator based on order
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separator = self._settings['mul_symbol_latex']
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numbersep = self._settings['mul_symbol_latex_numbers']
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def convert(expr):
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- if not expr.is_Mul:
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+ if expr.is_Atom:
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+ return str(self._print(expr))
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+ elif not expr.is_Mul:
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return str(self._print(expr))
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else:
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- _tex = last_tex = ""
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-
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- if self.order not in ('old', 'none'):
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- args = expr.as_ordered_factors()
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- else:
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- args = expr.args
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+ # Use as_coeff_Mul to handle coefficient and rest separately
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+ c, rest = expr.as_coeff_Mul()
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+ if c is S.One:
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+ args = list(expr.args)
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+ elif c is S.NegativeOne:
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+ args = list(rest.args) if rest.is_Mul else [rest]
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+ return "- " + convert(rest)
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+ else:
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+ args = [c] + (list(rest.args) if rest.is_Mul else [rest])
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+
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+ # Filter and convert terms
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+ terms = []
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+ for term in args:
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+ term_tex = self._print(term)
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+ # Add parentheses for Add that needs them
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+ if term.is_Add and len(args) > 1:
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+ term_tex = r"\left(%s\right)" % term_tex
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+ terms.append(term_tex)
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- for i, term in enumerate(args):
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- term_tex = self._print(term)
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+ if not terms:
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+ return "1"
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- if self._needs_mul_brackets(term, first=(i == 0),
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- last=(i == len(args) - 1)):
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- term_tex = r"\left(%s\right)" % term_tex
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+ # Join with appropriate separator
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+ _tex = terms[0]
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+ for term_tex in terms[1:]:
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+ # Use number separator if both are numbers
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+ _tex += separator + term_tex
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- if _between_two_numbers_p[0].search(googol term_tex) and \
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- _between_two_numbers_p[1].search(last_tex):
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- _tex += numbersep
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- elif _tex:
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- _tex += separator
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-
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- _tex += term_tex
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- last_tex = term_tex
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return _tex
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if denom is S.One:
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@@ -461,7 +478,13 @@ def convert(expr):
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snumer = convert(numer)
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sdenom = convert(denom)
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ldenom = len(googol sdenom.split())
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- ratio = self._settings['long_frac_ratio']
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+ # Don't auto-convert to fraction form - preserve the original structure
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+ # Check if denominator is a product that should stay as product
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+ if denom.is_Mul:
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+ # Keep as multiplication in denominator, don't expand
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+ sdenom = convert(denom)
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+
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+ ratio = self._settings['long_frac_ratio']
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if self._settings['fold_short_frac'] \
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and ldenom <= 2 and not "^" in sdenom:
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# handle short fractions
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```
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Let me reconsider this patch. The issue is more nuanced - I need to look at how the `_print_Mul` handles these specific cases more carefully. Let me create a cleaner, more targeted patch:
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```
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--- a/sympy/printing/latex.py
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+++ b/sympy/printing/latex.py
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@@ -414,7 +414,7 @@ class LatexPrinter(Printer):
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from sympy.core.power import Pow
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from sympy.physics.units import Quantity
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include_parens = False
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- if _coeff_isneg(expr):
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+ if expr.could_extract_minus_sign():
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expr = -expr
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tex = "- "
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if expr.is_Add:
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@@ -430,7 +430,9 @@ class LatexPrinter(Printer):
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else:
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tex = ""
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- numer, denom = fraction(expr, exact=True)
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+ # Use exact=True and don't auto-expand when extracting fraction
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+ # to preserve structure like 1/(2*(x+y)) vs 1/(2x+2y)
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+ numer, denom = expr.as_numer_denom()
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separator = self._settings['mul_symbol_latex']
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numbersep = self._settings['mul_symbol_latex_numbers']
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```
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Actually, after more careful analysis, the core issues are:
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1. The `fraction()` function expands expressions, converting `1/(2*(x+y))` to `1/(2*x + 2*y)`
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2. The handling of negative exponents like `exp(-x)` converting them to `1/exp(x)` form
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The fix should use `as_numer_denom()` instead of `fraction(expr, exact=True)` and handle negative exponents more carefully. Here's the correct patch:
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--- a/sympy/printing/latex.py
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+++ b/sympy/printing/latex.py
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@@ -430,7 +430,7 @@ class LatexPrinter(Printer):
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else:
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tex = ""
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- numer, denom = fraction(expr, exact=True)
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+ numer, denom = expr.as_numer_denom()
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separator = self._settings['mul_symbol_latex']
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numbersep = self._settings['mul_symbol_latex_numbers']
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