Before: -1^{x}
Now: \left(-1\right)^{x}
Added a test
---
sympy/printing/latex.py | 3 ++-
sympy/printing/tests/test_latex.py | 3 +++
2 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/sympy/printing/latex.py b/sympy/printing/latex.py
index cce22fc..b298be0 100644
--- a/sympy/printing/latex.py
+++ b/sympy/printing/latex.py
@@ -83,7 +83,8 @@ def _needs_brackets(self, expr):
printed, False otherwise. For example: a + b => True; a => False;
10 => False; -10 => True.
"""
- return not ((expr.is_Integer and expr.is_nonnegative) or expr.is_Atom)
+ return not ((expr.is_Integer and expr.is_nonnegative)
+ or (expr.is_Atom and expr is not S.NegativeOne))
def _needs_function_brackets(self, expr):
"""
diff --git a/sympy/printing/tests/test_latex.py
b/sympy/printing/tests/test_latex.py
index 7afaf28..8fad7ff 100644
--- a/sympy/printing/tests/test_latex.py
+++ b/sympy/printing/tests/test_latex.py
@@ -94,6 +94,9 @@ def test_latex_functions():
assert latex(gamma(x)) == r"\operatorname{\Gamma}\left(x\right)"
assert latex(Order(x)) == r"\operatorname{\mathcal{O}}\left(x\right)"
+def test_latex_brackets():
+ assert latex((-1)**x) == r"\left(-1\right)^{x}"
+
def test_latex_derivatives():
assert latex(diff(x**3, x, evaluate=False)) == \
r"\frac{\partial}{\partial x} x^{3}"
--
1.6.5
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