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Allows negative pow (#486)

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Sébastien d'Herbais de Thun 2023-04-01 14:24:43 +02:00 committed by GitHub
parent 613c644f04
commit 9e69a7b161
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1 changed files with 9 additions and 4 deletions
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13
library/src/compute/calc.rs
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@ -94,13 +94,18 @@ pub fn pow(
Num::Int(i) if i > u32::MAX as i64 => { Num::Int(i) if i > u32::MAX as i64 => {
bail!(exponent.span, "exponent too large"); bail!(exponent.span, "exponent too large");
} }
Num::Int(0..) => exponent.v, Num::Int(i) if i != 0 => exponent.v,
Num::Float(f) if f >= 0.0 => exponent.v, Num::Float(f) if f.is_normal() => exponent.v,
_ => { _ => {
bail!(exponent.span, "exponent must be non-negative"); bail!(exponent.span, "exponent must be normal (non-zero, non-NaN, non-infinite, non-subnormal)");
} }
}; };
base.apply2(exponent, |a, b| a.pow(b as u32), f64::powf)
match (base, exponent) {
(Num::Int(a), Num::Int(b)) if b > 0 => Value::Int(a.pow(b as u32)),
(a, Num::Int(b)) => Value::Float(a.float().powi(b as i32)),
(a, b) => Value::Float(f64::powf(a.float(), b.float())),
}
} }
/// Calculate the square root of a number. /// Calculate the square root of a number.