Not general relativity, maybe next time if my computer has enough memory and time for that. |

That's all Folks! |

clear all; close all; map = parula(256);

N = 256;

phi = zeros(N, N);

dphi = zeros(N, N);

ddphi= zeros(N, N);

rho = zeros(N, N);

[x y] = meshgrid(linspace(-1, 1, N));

f = 0;

for t = 1:3*N

A = 0.05;

if t>N

f = 0.01;

end

x1 = cos(2*pi*f*t)*A;

y1 = sin(2*pi*f*t)*A;

x2 = -cos(2*pi*f*t)*A;

y2 = -sin(2*pi*f*t)*A;

rho = exp(-2000*((x+x1).^2+(y+y1).^2)) + exp(-2000*((x+x2).^2+(y+y2).^2));

ddphi = rho + del2(phi);

dphi = dphi + ddphi;

phi(1, :) = phi(2, :);

dphi(1, :) = -dphi(2, :);

phi(end, :) = phi(end-1, :);

dphi(end, :) = -dphi(end-1, :);

phi(:, 1) = phi(:, 2);

dphi(:, 1) = -dphi(:, 2);

phi(:, end) = phi(:, end-1);

dphi(:, end) = -dphi(:, end-1);

phi = phi + dphi;

cla;

c = phi/max(max(phi));

surface(c, 'edgecolor', 'none');

colormap(map);

caxis([0 1]);

axis([1 N 1 N]);

axis square;

axis off;

shading interp;

drawnow;

imwrite(c*255, map, ['png/' num2str(t, '%04.f') '.png']);

end

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