Mercurial > repos > public > sbplib

view stencilEquation.m @ 1130:99fd66ffe714 feature/laplace_curvilinear_test

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add derivative of delta functions and corresponding tests, tested for 1D.
author Martin Almquist <malmquist@stanford.edu>
date Tue, 21 May 2019 18:44:01 -0700
parents 184833fe4c0e
children
line wrap: on
line source

% Find the equation for the stencil for d^k/dx^k
function [A,b] = stencilEquation(k, offsets, order)
    q = sym('q', [1, length(offsets)]);

    p = 0:(order-1+k);

    v     = vandermonde(offsets, p);
    vdiff = vandermonde(      0, p-k);

    eq = q*v == vdiff;

    [A,b] = equationsToMatrix(eq, q);
end