kalker/README.md

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![](logo.png)
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Kalk is a calculator (both program and library) that supports user-defined variables, functions, derivation, and integration. It runs on Windows, macOS, Linux, Android, and in web browsers (with WebAssembly).
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[![Crates.io](https://img.shields.io/crates/v/kalk_cli)](https://crates.io/crates/kalk_cli)![npm](https://img.shields.io/npm/v/@paddim8/kalk) [![GitHub](https://img.shields.io/github/license/PaddiM8/kalk)](https://github.com/PaddiM8/kalk/blob/master/LICENSE) [![Docs.rs](https://docs.rs/kalk/badge.svg)](https://docs.rs/kalk/latest/kalk/) ![Build status](https://img.shields.io/github/workflow/status/PaddiM8/kalk/Rust?event=push&label=build%20%26%20test)
[Kanban](https://kolan.strct.net/Board/4RAdMjLDz) | [Website](https://kalk.strct.net)
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![](preview.png)
## Features
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* Operators: +, -, \*, /, !
* Groups: (), ⌈⌉, ⌋⌊
* [Pre-defined functions and constants](https://github.com/PaddiM8/kalk/blob/master/kalk/src/prelude.rs)
* User-defined functions and variables. `f(x, y) = xy`, `x = 5`
* User-defined units (experimental). `unit m = cm/100`, `2m/50cm`, `50cm to m`
* Derivative of functions. `f'(2)`, `sin'(-pi)`
* Integration. `∫(0, pi, sin(x) dx)` or `∫(0, π, sin(x) dx)`
* Understands fairly ambiguous syntax. Eg. `2sin50 + 2xy`
* Syntax highlighting
* Special-symbol completion on tab. Eg. write `sqrt` and press tab. It will be turned into `√`.
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* Sum function: `sum(start, to, expression)` Eg. `sum(1, 3, 2n+1)` is the same as `2*1+1 + 2*2+1 + 2*3+1` = `15`
* Load a file including predefined functions and constants. For example, if you're going to use Kalk for physics, you load up your file with physics functions/constants when starting Kalk. `-i file`
* Misc: separate expressions by a semicolon to write them on the same line, use the `ans` variable to get the value of the previously calculated expression.
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## Libraries
There are currently three different libraries related to kalk.
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* [kalk](https://crates.io/crates/kalk): The Rust crate that powers it all.
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* [@paddim8/kalk](https://www.npmjs.com/package/@paddim8/kalk): JavaScript bindings for `kalk`. This lets you use it in the browser thanks to WebAssembly.
* [@paddim8/kalk-component](https://www.npmjs.com/package/@paddim8/kalk-component): A web component that runs `@paddim8/kalk`, which let's you use kalk in the browser with a command line-like interface.
## Installation
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### Binaries
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Pre-compiled binaries for Linux, Windows, and macOS (64-bit) are available in the [releases page](https://github.com/PaddiM8/kalk/releases).
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### Compiling
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**Minimum rust version: v1.36.0**. Make sure you have `diffutils` `gcc` `make` and `m4` installed. **If you use windows:** [follow the instructions here](https://docs.rs/gmp-mpfr-sys/1.2.3/gmp_mpfr_sys/index.html#building-on-windows) (don't forget to install `mingw-w64-x86_64-rust` in MSYS2).
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#### Cargo
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Run `cargo install kalk_cli`
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#### Manually
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1. Go into the `kalk_cli` directory.
2. Run `cargo build --release`
3. Grab the binary from `targets/release`
## Syntax
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A more complete reference can be found on [the website](https://kalk.strct.net)
### Functions
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**Defining:** name(parameter1, parameter2, ...) = expression\
**Example:** `f(x) = 2x+3`
**Using:** name(argument1, argument2)\
**Example:** `f(2)`
### Variables
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**Defining:** name = expression\
**Example:** `x = 3`
**Using:** name\
**Example:** `x`
### Units (experimental, are likely to not work properly)
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*Note: You only need to define the relationship between two units once. You will be able to convert between both of them.* **Defining:** `unit` name = expression\
**Example:** `unit deg = (rad*180)/π`
**Using:** Use them freely in expressions.\
**Example:** `2m/50cm`
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**Converting:** expression `to` unit\
**Example:** `2 m to cm`