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# [latex2sympy2](https://github.com/OrangeX4/latex2sympy)
## About
`latex2sympy2` parses **LaTeX math expressions** and converts it into the equivalent **SymPy form**. The latex2sympy2 is adapted from [augustt198/latex2sympy](https://github.com/augustt198/latex2sympy) and [purdue-tlt / latex2sympy](https://github.com/purdue-tlt/latex2sympy).
This project is a part of a VS Code extension called [Latex Sympy Calculator](https://marketplace.visualstudio.com/items?itemName=OrangeX4.latex-sympy-calculator). It is designed for providing people writing in latex or markdown a ability to calculate something when writing math expression.
[ANTLR](http://www.antlr.org/) 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...
* **Funcion 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...
* **Other:** Binomial...
**NOTICE:** It will do some irreversible calculations when converting determinants, transposed matrixes and elementary transformations...
## Installation
```
pip install latex2sympy2
```
**Requirements:** `sympy` and `antlr4-python3-runtime` packages.
## Usage
### Basic
In Python:
```python
from latex2sympy2 import latex2sympy, latex2latex
tex = r"\frac{d}{dx}(x^{2}+x)"
# Or you can use '\mathrm{d}' to replace 'd'
latex2sympy(tex)
# => "Derivative(x**2 + x, x)"
latex2latex(tex)
# => "2 x + 1"
```
### Examples
|LaTeX|Converted SymPy|Calculated Latex|
|-----|-----|---------------|
|`x^{3}` $x^{3}$| `x**3`|`x^{3}` $x^{3}$|
|`\frac{d}{dx} tx` $\frac{d}{dx}tx$|`Derivative(x*t, x)`|`t` $t$|
|`\sum_{i = 1}^{n} i` $\sum_{i = 1}^{n} i$|`Sum(i, (i, 1, n))`|`\frac{n \left(n + 1\right)}{2}` $\frac{n \left(n + 1\right)}{2}$|
|`\int_{a}^{b} \frac{dt}{t}`|`Integral(1/t, (t, a, b))`|`-\log{(a)} + \log{(b)}` $-\log{(a)} + \log{(b)}$|
|`(2x^3 - x + z)|_{x=3}` $(2x^3 - x + z)\|_{x=3}$|`z + 51`| `z + 51` $z + 51$ |
If you want to read the math formula, you can click [GitNotes](https://notes.orangex4.cool/?git=github&github=OrangeX4/latex2sympy).
### Solve Equation
``` latex
# Before
x + y = 1
# After
[ y = 1 - x, \ x = 1 - y]
```
### Eval At
``` latex
# Before
(x+2)|_{x=y+1}
# After
y + 3
```
### Matrix
#### Identity matrix
```
tex = r"\bm{I}_3"
latex2sympy(tex)
# => "Matrix([[1, 0, 0], [0, 1, 0], [0, 0, 1]])"
```
#### Determinant
``` python
from latex2sympy2 import latex2sympy
tex = r"\begin{vmatrix} x & 0 & 0 \\ 0 & x & 0 \\ 0 & 0 & x \end{vmatrix}"
latex2sympy(tex)
# => "x^{3}"
```
#### Transpose
``` python
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
``` python
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]])"
```
### Variances
``` python
from latex2sympy2 import latex2sympy, variances, var, set_variances
# Assign x a value of 1
latex2sympy(r"x = 1")
# Assign x a matrix symbol with dimension of n x m
latex2sympy(r"x \in \mathbb{R}^{n \times m}")
# Calculate x + y
latex2sympy(r"x + y")
# => "y + 1"
# Get all variances
print(variances)
# => "{x: 1}"
# Get variance of "x"
print(var["x"])
# => "1"
# Reset all variances
set_variances({})
latex2sympy(r"x + y")
# => "x + y"
```
### Complex Number Support
``` python
from latex2sympy2 import set_real
set_real(False)
```
## Contributing
If you want to add a new grammar, you can fork the code from [OrangeX4/latex2sympy](https://github.com/OrangeX4/latex2sympy).
* To modify parser grammar, view the existing structure in `PS.g4`.
* To modify the action associated with each grammar, look into `latex2sympy.py`.
Contributors are welcome! Feel free to open a pull request or an issue.
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