📄 ex04ch4.m
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function sol = ex04ch4sol = dde23(@ddes,[1, 0.5],@history,[0, 1]);plot(sol.x,sol.y);%===========================================function dydt = ddes(t,y,Z)ylag1 = Z(:,1);ylag2 = Z(:,2);dydt = zeros(5,1);dydt(1) = ylag1(5) + ylag1(3);dydt(2) = ylag1(1) + ylag2(2);dydt(3) = ylag1(3) + ylag2(1);dydt(4) = ylag1(5)*ylag1(4);dydt(5) = ylag1(1);function v = history(t)v = zeros(5,1);v(1) = exp(t+1);v(2) = exp(t+0.5);v(3) = sin(t+1);v(4) = v(1);v(5) = v(1);
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