latex2sympy2_extended

About

latex2sympy2_extended parses LaTeX math expressions and converts it into the equivalent SymPy form. The latex2sympy2_extended is adapted from OrangeX4/latex2sympy.

ANTLR 4.13.1 is used to generate the parser.

Features

• Arithmetic: Add (+), Sub (-), Dot Mul (·), Cross Mul (×), Frac (/), Power (^), Abs (|x|), Sqrt (√), etc...
• Alphabet: a - z, A - Z, α - ω, Subscript (x_1), Accent Bar(ā), etc...
• Common Functions: gcd, lcm, floor, ceil, max, min, log, ln, exp, sin, cos, tan, csc, sec, cot, arcsin, sinh, arsinh, etc...
• Function Symbol: f(x), f(x-1,), g(x,y), etc...
• Calculous: Limit ($lim_{n\to\infty}$), Derivation ($\frac{d}{dx}(x^2+x)$), Integration ($\int xdx$), etc...
• Linear Algebra: Matrix, Determinant, Transpose, Inverse, Elementary Transformation, etc...
• Set: Union (∪), Intersection (∩), etc...
• Other: Binomial...

NOTICE: It will do some irreversible calculations when converting determinants, transposed matrixes and elementary transformations...

NOTICE: comma separated numbers are only supported in standalone form: 1,233, not in expressions: 1,233x.

Installation

Current version supports 3 runtimes:

• 4.9.3
• 4.11.0
• 4.13.2

Use the following command to install with the runtime you need:

pip install latex2sympy2_extended[antlr4_13_2]

Requirements: sympy and antlr4-python3-runtime packages.

Usage

Basic

In Python:

from latex2sympy2_extended import latex2sympy

tex = r"\frac{d}{dx}(x^{2}+x)"
latex2sympy(tex)
# => "Derivative(x**2 + x, x)"

Examples

Eval At

# Before
(x+2)|_{x=y+1}

# After
y + 3

Matrix

Determinant

from latex2sympy2 import latex2sympy

tex = r"\begin{vmatrix} x & 0 & 0 \\ 0 & x & 0 \\ 0 & 0 & x \end{vmatrix}"
latex2sympy(tex)
# => "x^{3}"

Transpose

from latex2sympy2 import latex2sympy

tex = r"\begin{pmatrix} 1 & 2 & 3 \\ 4 & 5 & 6 \\ 7 & 8 & 9 \end{pmatrix}^T"
# Or you can use "\begin{pmatrix}1&2&3\\4&5&6\\7&8&9\end{pmatrix}'"
latex2sympy(tex)
# => "Matrix([[1, 4, 7], [2, 5, 8], [3, 6, 9]])"

Elementary Transformation

from latex2sympy2 import latex2sympy

matrix = r'''
    \begin{pmatrix}
        1 & 2 & 3 \\ 
        4 & 5 & 6 \\
        7 & 8 & 9 \\ 
    \end{pmatrix}
'''

# Scale the row with grammar "\xrightarrow{kr_n}"
tex = matrix + r'\xrightarrow{3r_1}'
latex2sympy(tex)
# => "Matrix([[3, 6, 9], [4, 5, 6], [7, 8, 9]])"

# Swap the cols with grammar "\xrightarrow{c_1<=>c_2}"
# Of course, you can use "\leftrightarrow" to replace "<=>" 
tex = matrix + r'\xrightarrow{c_1<=>c_2}'
latex2sympy(tex)
# => "Matrix([[2, 1, 3], [5, 4, 6], [8, 7, 9]])"

# Scale the second row and add it to the first row
# with grammar "\xrightarrow{r_1+kr_2}"
tex = matrix + r'\xrightarrow{r_1+kr_2}'
latex2sympy(tex)
# => "Matrix([[4*k + 1, 5*k + 2, 6*k + 3], [4, 5, 6], [7, 8, 9]])"

# You can compose the transform with comma ","
# and grammar "\xrightarrow[4r_3]{2r_1, 3r_2}"
# Remember the priority of "{}" is higher than "[]"
tex = matrix + r'\xrightarrow[4r_3]{2r_1, 3r_2}'
latex2sympy(tex)
# => "Matrix([[2, 4, 6], [12, 15, 18], [28, 32, 36]])"

Complex Number Support

from latex2sympy2 import set_real

set_real(False)

Contributing

If you want to add a new grammar, you can fork the code from hynky1999/latex2sympy2_extended.

• To modify parser grammar, view the existing structure in src/latex2sympy2_extended/PS.g4.
• To modify the action associated with each grammar, look into src/latex2sympy2_extended/latex2sympy2.py.

Contributors are welcome! Feel free to open a pull request or an issue.