| 1 | use core::f64; |
|---|---|
| 2 | |
| 3 | /// Positive difference (f64) |
| 4 | /// |
| 5 | /// Determines the positive difference between arguments, returning: |
| 6 | /// * x - y if x > y, or |
| 7 | /// * +0 if x <= y, or |
| 8 | /// * NAN if either argument is NAN. |
| 9 | /// |
| 10 | /// A range error may occur. |
| 11 | #[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)] |
| 12 | pub fn fdim(x: f64, y: f64) -> f64 { |
| 13 | if x.is_nan() { |
| 14 | x |
| 15 | } else if y.is_nan() { |
| 16 | y |
| 17 | } else if x > y { |
| 18 | x - y |
| 19 | } else { |
| 20 | 0.0 |
| 21 | } |
| 22 | } |
| 23 |