finitediff::vec::hessian

Function forward_hessian_nograd_sparse_vec

Source 
pub fn forward_hessian_nograd_sparse_vec<F>(
    x: &Vec<F>,
    f: &'_ dyn Fn(&Vec<F>) -> Result<F, Error>,
    indices: Vec<[usize; 2]>,
) -> Result<Vec<Vec<F>>, Error>
where
    F: Float + FromPrimitive + AddAssign,