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view stencilEquation.m @ 856:ee4cfb37534d feature/poroelastic

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Merge with feature/d1_staggered to get RK timestepper for discrete data.
author Martin Almquist <malmquist@stanford.edu>
date Tue, 02 Oct 2018 13:39:10 -0700
parents 184833fe4c0e
children
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% 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