pub fn new() -> Self {
        PerturbationVector {
            x_idx: vec![],
            r_idx: vec![],
        }
    }
/// Create a new empty `PerturbationVector`
Create a new empty `PerturbationVector`
Create a new empty ` PerturbationVector `
pub fn new() -> Self {
        PerturbationVector {
            x_idx: vec![],
            r_idx: vec![],
        }
    }
pub fn new ( ) -> Self { PerturbationVector { x_idx : vec ! [ ] , r_idx : vec ! [ ] , } }
Create a new empty `PerturbationVector`
Create a new empty ` PerturbationVector `