Trait indxvec::Indices

pub trait Indices {
    fn invindex(self) -> Vec<usize>;
    fn unindex<T: Copy>(self, ascending: bool, v: &[T]) -> Vec<T>;
    fn ucorrelation(self, v: &[usize]) -> f64;
}

Methods to manipulate indices of Vec type

Required methods

fn invindex(self) -> Vec<usize>

Reverse index

fn unindex<T: Copy>(self, ascending: bool, v: &[T]) -> Vec<T>

Collects f64 values from v as per indices in self.

fn ucorrelation(self, v: &[usize]) -> f64

Pearson’s correlation coefficient of two slices, typically the ranks.

Implementations on Foreign Types

impl Indices for &[usize]

fn invindex(self) -> Vec<usize>

Constructs inverted index, eg. from sort index to data ranks This is a symmetric operation, i.e. any even number of applications leads back to the original index form.

fn unindex<T: Copy>(self, ascending: bool, v: &[T]) -> Vec<T>

Collects values from v in the order given by self index. When ascending is false, creates descending order. Used by msort for ascending or descending sort. Good for efficient sorting of any vectors.

fn ucorrelation(self, v: &[usize]) -> f64

Pearson’s correlation coefficient of two $usize slices. When the inputs are ranks, then this gives Spearman’s correlation of the original data. However, in general, any other ordinal measures can be deployed (not just the ranks).

Implementors