Mercurial > repos > public > sbplib

view stencilEquation.m @ 981:a2fcc4cf2298 feature/getBoundaryOp

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Update scheme.Elastic2dVariable by copy-pasting from feature/poroelastic. This is compatible with new getBoundaryOperator in multiblock.DiffOp.
author Martin Almquist <malmquist@stanford.edu>
date Mon, 07 Jan 2019 17:10:06 +0100
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