Add second year
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function dydt = shark_tuna_model(t,x)
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% function to model the prey-predator population relations over time of
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% sharks & tuna
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global k; % mentioning global variable x so that it can be used here
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dydt = [0; 0];
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% dS/dt = k1 S T - k2 S
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dydt(1) = k(1)*x(1)*x(2)-k(2)*x(1);
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% dT/dt = k3 T -k4 S T
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dydt(2) = k(3)*x(2) - k(4) * x(1) * x(2);
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end
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