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Universal functionn implemented for more NumPy compatibility. #101

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819dda9
Generalized indexing, correct formatting for arrays, new constants.
Mar 6, 2026
50c705d
ufuncs implemented.
Mar 6, 2026
ad20538
Minimum, maximum added.
Mar 26, 2026
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3 changes: 3 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased]
### Added
- Electric and Coulomb constants added. [#47](https://github.com/itt-ustutt/quantity/issues/47)
- ATM and POISE added as derived units. [#46](https://github.com/itt-ustutt/quantity/issues/46)

## [0.13.0] - 2026-01-06
### Changed
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5 changes: 5 additions & 0 deletions si-units/CHANGELOG.md
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Expand Up @@ -5,6 +5,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased]
### Fixed
- Correctly formats output of arrays with a unit.

### Added
- Getter and Setter generalized to common NumPy indexing, such that general slicing operations are possible in multiple dimensions.

## [0.11.1] - 2026-01-22
### Fixed
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42 changes: 23 additions & 19 deletions si-units/docs/derived.md
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Expand Up @@ -23,28 +23,32 @@ For convenience, a number of commonly used units that are not directly combinati
These constants simplify the specification of properties, that are not given in SI units. However, as the representation
of quantities is unique, they do not appear in formatted outputs.

| Unit | Unit symbol | Quantity | Definition |
| -------- | ------------ | ------------- | --------------------------------------------- |
| ANGSTROM | $\text{Å}$ | length | $10^{-10}~\text{m}$ |
| AMU | $\text{u}$ | mass | $1.6605390671738466\times 10^{-27}~\text{kg}$ |
| AU | $\text{au}$ | length | $149597870700~\text{m}$ |
| BAR | $\text{bar}$ | pressure | $10^5~\text{Pa}$ |
| CALORIE | $\text{cal}$ | energy | $4.184~\text{J}$ |
| DAY | $\text{d}$ | time | $86400~\text{s}$ |
| DEBYE | $\text{De}$ | dipole moment | $\sqrt{10^{-19}~\text{JÅ}^3}$ |
| DEGREES | $^\circ$ | angle | $\frac{\pi}{180}~\text{rad}$ |
| GRAM | $\text{g}$ | mass | $10^{-3}~\text{kg}$ |
| HOUR | $\text{h}$ | time | $3600~\text{s}$ |
| LITER | $\text{l}$ | volume | $10^{-3}~\text{m}^3$ |
| MINUTE | $\text{min}$ | time | $60~\text{s}$ |
| RADIANS | $\text{rad}$ | angle | |
| Unit | Unit symbol | Quantity | Definition |
| -------- | --------------- | ------------- | --------------------------------------------- |
| ANGSTROM | $\text{Å}$ | length | $10^{-10}~\text{m}$ |
| AMU | $\text{u}$ | mass | $1.6605390671738466\times 10^{-27}~\text{kg}$ |
| ATM | $\text{bar}$ | presssure | $101325~\text{N/m^2}$ |
| AU | $\text{au}$ | length | $149597870700~\text{m}$ |
| BAR | $\text{bar}$ | pressure | $10^5~\text{Pa}$ |
| CALORIE | $\text{cal}$ | energy | $4.184~\text{J}$ |
| DAY | $\text{d}$ | time | $86400~\text{s}$ |
| DEBYE | $\text{De}$ | dipole moment | $\sqrt{10^{-19}~\text{JÅ}^3}$ |
| DEGREES | $^\circ$ | angle | $\frac{\pi}{180}~\text{rad}$ |
| GRAM | $\text{g}$ | mass | $10^{-3}~\text{kg}$ |
| HOUR | $\text{h}$ | time | $3600~\text{s}$ |
| LITER | $\text{l}$ | volume | $10^{-3}~\text{m}^3$ |
| MINUTE | $\text{min}$ | time | $60~\text{s}$ |
| POISE | $\text{m Pa s}$ | viscosity | $0.1~\text{Pa s}$ |
| RADIANS | $\text{rad}$ | angle | |

## Additional Constants

| Constant | Name | Symbol | Value |
| -------- | ---------------------- | ------------------------- | ------------------------------------------------------------------- |
| G | Gravitational constant | $G$ | $6.6743\times 10^{-11}~\frac{\text{m}^3}{\text{kg}\cdot\text{s}^2}$ |
| RGAS | Ideal gas constant | $R=N_\text{Av}k_\text{B}$ | $8.31446261815324~\frac{\text{J}}{\text{mol}\cdot\text{K}}$ |
| Constant | Name | Symbol | Value |
| -------- | ---------------------- | ----------------------------------------- | ---------------------------------------------------------------------- |
| G | Gravitational constant | $G$ | $6.6743\times 10^{-11}~\frac{\text{m}^3}{\text{kg}\cdot\text{s}^2}$ |
| EPSILON0 | Electric constant | $\epsilon_0$ | $8.8541878188e-12~\frac{\text{A}\cdot\text{s}}{\text{V}\cdot\text{m}}$ |
| KE | Coulomb constant | $k_\text{e} = \frac{1}{4 \pi \epsilon_0}$ | $8987551786.170797~\frac{\text{N}\cdot\text{m}^2}{\text{C}^2}$ |
| RGAS | Ideal gas constant | $R=N_\text{Av}k_\text{B}$ | $8.31446261815324~\frac{\text{J}}{\text{mol}\cdot\text{K}}$ |

### Example

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9 changes: 9 additions & 0 deletions si-units/src/fmt.rs
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Expand Up @@ -73,6 +73,15 @@ impl SINumber {
format!("{}\\,{}", float_to_latex(self.value), &self.unit.to_latex())
}
}

pub fn into_scaled_parts(&self) -> (f64, String) {
if let Some((unit, symbol, _, _, _)) = DERIVED_UNITS.get(&self.unit) {
if !self.value.is_nan() {
return (self.value / unit.value, symbol.clone());
}
}
(self.value, self.unit.to_string())
}
}

fn float_to_latex(f: f64) -> String {
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