bjoernager/rust
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Remove fNN::lerp - consensus unlikely

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CAD97 2021-10-25 22:22:17 -05:00
parent ffba430924
commit 6b449b49bb
5 changed files with 0 additions and 191 deletions
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36
library/std/src/f64.rs
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@ -881,42 +881,6 @@ impl f64 {
0.5 * ((2.0 * self) / (1.0 - self)).ln_1p()
}
/// Linear interpolation between `start` and `end`.
///
/// This enables linear interpolation between `start` and `end`, where start is represented by
/// `self == 0.0` and `end` is represented by `self == 1.0`. This is the basis of all
/// "transition", "easing", or "step" functions; if you change `self` from 0.0 to 1.0
/// at a given rate, the result will change from `start` to `end` at a similar rate.
///
/// Values below 0.0 or above 1.0 are allowed, allowing you to extrapolate values outside the
/// range from `start` to `end`. This also is useful for transition functions which might
/// move slightly past the end or start for a desired effect. Mathematically, the values
/// returned are equivalent to `start + self * (end - start)`, although we make a few specific
/// guarantees that are useful specifically to linear interpolation.
///
/// These guarantees are:
///
/// * If `start` and `end` are [finite], the value at 0.0 is always `start` and the
/// value at 1.0 is always `end`. (exactness)
/// * If `start` and `end` are [finite], the values will always move in the direction from
/// `start` to `end` (monotonicity)
/// * If `self` is [finite] and `start == end`, the value at any point will always be
/// `start == end`. (consistency)
///
/// [finite]: #method.is_finite
#[must_use = "method returns a new number and does not mutate the original value"]
#[unstable(feature = "float_interpolation", issue = "86269")]
pub fn lerp(self, start: f64, end: f64) -> f64 {
// consistent
if start == end {
start
// exact/monotonic
} else {
self.mul_add(end, (-self).mul_add(start, start))
}
}
// Solaris/Illumos requires a wrapper around log, log2, and log10 functions
// because of their non-standard behavior (e.g., log(-n) returns -Inf instead
// of expected NaN).