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view stencilEquation.m @ 1250:8ec777fb473e

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Merged in feature/dirac_discr (pull request #17) Add multi-d dirac discretization with tests Approved-by: Vidar Stiernström <vidar.stiernstrom@it.uu.se> Approved-by: Martin Almquist <malmquist@stanford.edu> Approved-by: Jonatan Werpers <jonatan.werpers@it.uu.se>
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Wed, 20 Nov 2019 22:24:06 +0000
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