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StreamingStats

Struct StreamingStats 

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pub struct StreamingStats { /* private fields */ }
Expand description

Accumulateur de moyenne en ligne, O(1) mémoire.

Implémente la mise à jour incrémentale de Welford :

mean_n = mean_{n-1} + (x_n − mean_{n-1}) / n

Stable numériquement même pour des millions de points. Rejette les valeurs non-finies sans corrompre l’état interne.

§Exemples

use embedded_stats_f32::{StreamingStats, StatsError};

let mut s = StreamingStats::new();
for x in [1.0_f32, 2.0, 3.0, 4.0, 5.0] { s.update(x).unwrap(); }

assert!((s.mean().unwrap() - 3.0).abs() < 1e-6);
assert_eq!(s.count(), 5);

// NaN rejeté, état interne préservé
assert_eq!(s.update(f32::NAN), Err(StatsError::NonFiniteValue));
assert_eq!(s.count(), 5);

Implementations§

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impl StreamingStats

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pub const fn new() -> Self

Crée un accumulateur vide.

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pub fn update(&mut self, x: f32) -> Result<(), StatsError>

Intègre une nouvelle observation.

Retourne StatsError::NonFiniteValue si x est NaN ou ±inf. En cas d’erreur, l’état interne est inchangé.

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pub fn mean(&self) -> Result<f32, StatsError>

Retourne la moyenne courante.

§Erreurs
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pub const fn count(&self) -> u32

Retourne le nombre d’observations intégrées.

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pub fn reset(&mut self)

Remet l’accumulateur à zéro.

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pub fn running_variance(&self) -> Result<f32, StatsError>

Variance de population (diviseur N) en streaming.

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pub fn running_std_dev(&self) -> Result<f32, StatsError>

Écart type en streaming (= √variance).

Trait Implementations§

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impl Clone for StreamingStats

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fn clone(&self) -> StreamingStats

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for StreamingStats

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for StreamingStats

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl Copy for StreamingStats

Auto Trait Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.