Trait indxvec::Indices

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

Methods to manipulate indices of Vec<usize> type.

Required methods

fn invindex(self) -> Vec<usize>

Reverse index

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

Inverts an index, eg. from sort index to data ranks. This is a symmetric operation: any even number of applications gives the original index, odd number gives the inverted form.

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

Collects values from v in the order given by self index. When ascending is false, collects in descending order.
It is used here by msort for ascending or descending sort.

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 could be deployed (not just the ranks).

Implementors