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Original file (840 × 631 pixels, file size: 818 KB, MIME type: image/gif, looped, 100 frames, 5.0 s)

Summary

Description
English: Method of lines - the example, which shows the origin of the name of method.

Solid line represents an analytical solution, and lines show evolution in time of numerical solution by means of method of lines. For details see: Schiesser, W. E. (1991) The Numerical Method of Lines, Academic Press ISBN: 0-12-624130-9.

Click full resolution to see an animation.

The source code:

function mol
u = @(t,x)0.5./sqrt(4*t+1)*(exp(3*(2*x+1)/(4*t+1))+2).*exp(-(x+2).^2/(4*t+1));
M = 40;
N = 100;
x = linspace(-5,5,M+1);
y0 = 0.5*exp(-(x-1).^2)+exp(-(x+2).^2);
[t,y] = ode45(@dmol,linspace(0,0.5,N),y0(2:end));
y = [zeros(N,1) y];

hold on
for tt=1:numel(t)
    cla
    stem(x,y(tt,:),'k')
    plot(x,u(t(tt),x),'k')
    text(0.8,0.8,['t = ' num2str(t(tt)) 's']);
    ylim([0 1])
    xlabel('x')
    ylabel('u(x,t)')
    drawnow   
end

    function dy=dmol(~,y)
        dx = 10/M;
        y0 = 0;
        for m=M:-1:1
            if m==1
                dy(m,1) = (y(m+1)-2*y(m)+y0)/(dx^2);
            elseif m==M
                dy(m,1) = 0;
            else
                dy(m,1) = (y(m+1)-2*y(m)+y(m-1))/(dx^2);
            end
        end
    end %dmol function

end %mol function
Polski: Metoda linii - przykład, który przedstawia pochodzenie nazwy metody. Kliknij Pełna rozdzielczość żeby zobaczyć animację.
Date
Source Own work
Author Grzegorz Knor

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23 July 2013

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Date/TimeThumbnailDimensionsUserComment
current10:50, 23 July 2013Thumbnail for version as of 10:50, 23 July 2013840 × 631 (818 KB)GknorUser created page with UploadWizard

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