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Add dirichlet bc for north and south boundary and handle cases where the wave speed changes in sign.
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Mon, 07 Jan 2019 12:06:06 +0100
parents e76321b89c1e
children
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function A = spdiag(a,i)
    default_arg('i',0);

    if isrow(a)
        a = a';
    end

    n = length(a)+abs(i);
    A = spdiags(a,i,n,n);
end