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Interpolation strategies.

Structs

Select the higher value.
Linearly interpolate between the two values (lower + (higher - lower) * fraction, where fraction is the fractional part of the index surrounded by lower and higher).
Select the lower value.
Select the midpoint of the two values ((lower + higher) / 2).
Select the nearest value.

Traits

Used to provide an interpolation strategy to quantile_axis_mut.