Struct PartialDerivPlan 

pub struct PartialDerivPlan { /* private fields */ }

Plan for computing coefficients for partial derivatives.

This struct holds a plan for efficiently evaluating the partial derivative of polynomials.

Examples

The partial derivative of $f(x, y) = x y - x^2 + 2$ (coefficients: [0, 1, 0, -1, 0, 2]) to the first variable, $x$:

use nutils_poly::PartialDerivPlan;
use sqnc::traits::*;

let f = [0, 1, 0, -1, 0, 2];
let plan = PartialDerivPlan::new(
    2, // number of variables
    2, // degree
    0, // variable to compute the partial derivative to
).unwrap();
assert!(Iterator::eq(
    plan.apply(f)?.iter(),
    [1, -2, 0],
));

Implementations

impl PartialDerivPlan

pub fn new(nvars: usize, degree: Power, var: usize) -> Option<Self>

Plan the partial derivative of a polynomial.

pub fn apply<Coeffs>( &self, coeffs: Coeffs, ) -> Result<PartialDeriv<'_, Coeffs>, Error>

where Coeffs: Sequence,

Returns the partial derivative of a polynomial.

Errors

If the number of coefficients of the input doesn’t match PartialDerivPlan::ncoeffs_input() then this function returns an error.

pub fn ncoeffs_input(&self) -> usize

Returns the number of coefficients for the input polynomial.

pub fn ncoeffs_output(&self) -> usize

Returns the number of coefficients for the partial derivative.

pub fn degree_output(&self) -> Power

Returns the degree of the partial derivative.

pub fn nvars(&self) -> usize

Returns the number of variables of both the input and the output.

Trait Implementations

impl Clone for PartialDerivPlan

fn clone(&self) -> PartialDerivPlan

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PartialDerivPlan

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.