What is the best way to take the n-th root of an arbitrary number in rust? The num crate for example only allows to take n-th principal roots of integer types, i.e., floor'ed or ceil'ed values... How to best closely approximate the actual value?
1 Answers
Mathematically, nth root is actually 1 / n power to the number.
You can use f64::powf(num, 1.0 / nth) to calculate such roots.
fn main(){
println!("{:?}", f64::powf(100.0, 1.0 / 3.0));
// same as cbrt(100), cube root of 100
// general formula
// f64::powf(number, 1.0 / power)
}
You can use f32::powf also, there's no problem with it.
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