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view +util/matrixborrow.m @ 851:ab2e5a24ddde feature/burgers1d

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- Fix bug when constructing closure for narrow stencils - Update the residual outside of the RK time steps. At least for the inner convergence rate, updating the residual inside does not seem to be required.
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Fri, 21 Sep 2018 15:33:15 +0200
parents 48b6fb693025
children
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function alpha = matrixborrow(A,B)

    function y = neg(x)
        y = min(eig(A-x*B));
    end


    x0 = 1;
    while neg(x0) > -1
        x0 = 2*x0;
    end

    opt = optimset('Display','none');
    alpha = fsolve(@neg, x0,opt);
end