## app math_repl

Simple REPL for all different kinds of math

### 4 releases

 0.2.1 May 23, 2024 May 22, 2024 Apr 14, 2024 Mar 29, 2024

#171 in Math

2.5MB
400 lines

math_repl is a CLI REPL that allows a user to quickly calculate expressions, save the results in variables and use those variables in another expression or equation. It additionally allows a user to solve equations, save its results in variables and use them anywhere. All steps that are taken are recorded and can be exported to LaTeX (see Usage below).

math_repl does not only support numbers but also vectors and matrices.

⚠️ math_repl is built on top of math_utils_lib, which has not yet reached 1.0.0. Expect breaking changes and bugs.

## Installation

You can install math_repl from crates.io.

cargo install math_repl

Make sure that ~/.cargo/bin is on PATH.

## Usage

Here is some usage information from the internal help command:

You can do 4 basic operations:
Calculate something: <expr>
Save the results of a calculation to a variable: <varName> = <expr>
Solve an equation or a system of equations: eq <expr> = <expr> (, <expr> = <expr>, ...)
Solve an equation or a system of equations and save it into a variable: <varName> = eq <expr> = <expr> (, <expr> = <expr>, ...)
As an <expr> counts:
A scalar (number): <number>
A vector: [<1>, <2>, ..., <n>]
A matrix: [[<1:1>, <1:2>, ..., <1:n>], [<2:1>, <2:2>, ..., <2:n>], ..., [<n:1>, <n:2>, ..., <n:n>]] (column major order)
A Variable: Any previously defined variable.

You can also use all common operations (see https://docs.rs/math_utils_lib/latest/math_utils_lib/parser/enum.SimpleOpType.html)
between all different types (It will tell you, when it can't calculate something).
clear: Clears the screen, the history for LaTeX export and all vars except pi and e.
clearvars: Clears all vars except pi and e.
vars: Displays all vars.
export (< --tex | --png >): Exports history since last clear in specified format (leave blank for .pdf).
help: This help page.
exit: Exits the REPL.
Some rules:
Variable Names must start with an alphabetical letter or a \\. (Greek symbols in LaTeX style get replaced before printing).
Numbers in Variable Names are only allowed in LaTeX style subscript.
Any other rules will be explained to you in a (not so) nice manner by the program.

~2–10MB
~87K SLoC