You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
35 lines
991 B
35 lines
991 B
from sympy.external import import_module
|
|
from sympy.utilities.decorator import doctest_depends_on
|
|
|
|
from .errors import LaTeXParsingError # noqa
|
|
|
|
@doctest_depends_on(modules=('antlr4',))
|
|
def parse_latex(s):
|
|
r"""Converts the string ``s`` to a SymPy ``Expr``
|
|
|
|
Parameters
|
|
==========
|
|
|
|
s : str
|
|
The LaTeX string to parse. In Python source containing LaTeX,
|
|
*raw strings* (denoted with ``r"``, like this one) are preferred,
|
|
as LaTeX makes liberal use of the ``\`` character, which would
|
|
trigger escaping in normal Python strings.
|
|
|
|
Examples
|
|
========
|
|
|
|
>>> from sympy.parsing.latex import parse_latex
|
|
>>> expr = parse_latex(r"\frac {1 + \sqrt {\a}} {\b}")
|
|
>>> expr
|
|
(sqrt(a) + 1)/b
|
|
>>> expr.evalf(4, subs=dict(a=5, b=2))
|
|
1.618
|
|
"""
|
|
|
|
_latex = import_module(
|
|
'sympy.parsing.latex._parse_latex_antlr',
|
|
import_kwargs={'fromlist': ['X']})
|
|
|
|
if _latex is not None:
|
|
return _latex.parse_latex(s)
|