# [−]Struct lumol::energy::Harmonic

pub struct Harmonic {
pub k: f64,
pub x0: f64,
}

Harmonic potential.

$$V(x) = \frac{1}{2} k (x - x_0)^2$$

where $x_0$ is the distance equilibrium, and $k$ the elastic constant.

# Examples

let potential = Harmonic { x0: 2.0, k: 100.0 };
assert_eq!(potential.energy(2.0), 0.0);
assert_eq!(potential.energy(3.0), 50.0);

assert_eq!(potential.force(2.0), 0.0);
assert_eq!(potential.force(1.5), 50.0);

## Fields

Spring constant

Equilibrium value

## Trait Implementations

### impl BondPotential for Harmonic

#### fn virial(&self, r: &Vector3D) -> Matrix3

Compute the virial contribution corresponding to the distance r between the particles. Read more

### impl PairPotential for Harmonic

#### fn tail_energy(&self, f64) -> f64

Compute the tail correction to the energy for the given cutoff. Read more

#### fn tail_virial(&self, f64) -> f64

Compute the tail correction to the virial for the given cutoff. Read more

#### fn virial(&self, r: &Vector3D) -> Matrix3

Compute the virial contribution corresponding to the distance r between the particles. Read more

### impl Potential for Harmonic

#### fn energy(&self, x: f64) -> f64

Get the energy corresponding to the variable x

#### fn force(&self, x: f64) -> f64

Get the force norm corresponding to the variable x

### impl Clone for Harmonic

#### fn clone(&self) -> Harmonic

Returns a copy of the value. Read more

#### fn clone_from(&mut self, source: &Self)1.0.0[src]

Performs copy-assignment from source. Read more

### impl FromToml for Harmonic

#### fn from_toml(table: &BTreeMap<String, Value>) -> Result<Harmonic, Error>

Do the conversion from table to Self.

## Blanket Implementations

### impl<T> ToOwned for T where    T: Clone, [src]

#### fn to_owned(&self) -> T[src]

Creates owned data from borrowed data, usually by cloning. Read more

#### fn clone_into(&self, target: &mut T)[src]

🔬 This is a nightly-only experimental API. (toowned_clone_into)

Uses borrowed data to replace owned data, usually by cloning. Read more

### impl<T> From for T[src]

#### fn from(t: T) -> T[src]

Performs the conversion.

### impl<T, U> Into for T where    U: From<T>, [src]

#### fn into(self) -> U[src]

Performs the conversion.

### impl<T, U> TryFrom for T where    T: From<U>, [src]

#### type Error = !

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

### impl<T> Borrow for T where    T: ?Sized, [src]

#### ⓘImportant traits for &'a mut R### Important traits for &'a mut R impl<'a, R> Read for &'a mut R where    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

### impl<T, U> TryInto for T where    U: TryFrom<T>, [src]

#### type Error = <U as TryFrom<T>>::Error

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

### impl<T> BorrowMut for T where    T: ?Sized, [src]

#### ⓘImportant traits for &'a mut R### Important traits for &'a mut R impl<'a, R> Read for &'a mut R where    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

### impl<T> Any for T where    T: 'static + ?Sized, [src]

#### fn get_type_id(&self) -> TypeId[src]

🔬 This is a nightly-only experimental API. (get_type_id)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

### impl<P> Potential for P where    P: 'static + Computation + Clone,

#### fn energy(&self, r: f64) -> f64

Get the energy corresponding to the variable x

#### fn force(&self, r: f64) -> f64

Get the force norm corresponding to the variable x