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1.1 KiB
1.1 KiB
kalk
Kalk is a math parser library that supports user-defined variables and functions. An example of what it can parse:
f(x, y) = sum(1, 3, (2sin4/x!)^y) + cos(n deg)
a = 3
f(a, 2)
>> 1.1899401098014355
Features
- Operators: +, -, *, /, !
- Groups: (), ⌈⌉, ⌋⌊
- Pre-defined functions and constants
- User-defined functions and variables.
f(x, y) = xy
,x = 5
- 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√
.
Usage
use kalk::parser;
let mut parser_context = parser::Context::new();
let precision = 53;
let result = parser::eval(&mut parser_context, "5*3", precision).unwrap().unwrap();
assert_eq!(result.to_f64(), 15f64);
Using f64 instead of rug::Float
The cargo feature rug
enables rug, and is used by default. If you disalbe this, kalk will use f64
instead, making it more portable.
Compiling
Make sure you have diffutils
gcc
make
and m4
installed.