first steps using dde23

2016 4 14
1 个回答
回答已采纳
更新时间：2016 4 21
109 次查看（30 天）

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I want to solve the function
function Change = logisticGrowth( t,Population )
Limit=100;
MaxGrowthRate=0.2;
LossRate=0.02;
Density = Population / Limit;
Loss = Population * LossRate;
Change=Population*MaxGrowthRate*(1-Density)-Loss;
end
with a delay of 5 years using
delay=5;
before=2;
timespan=[0 100];
dde23(@logisticGrowth,delay,before,timespan)
and Matlab tells: "Error using logisticGrowth. Too many input arguments."
I appreciate your hints.

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 采纳的回答

Heinz_M
Heinz_M 2016-4-21

0 个投票

There is a possible solution.
function solution
delay=5;
before=2; % history
timespan=[0, 100];
Limit=100;
MaxGrowthRate=0.2;
LossRate=0.02;
dde_options = ddeset('RelTol',1e-07);
sol=dde23(@logistic,delay,before,timespan,dde_options,Limit,MaxGrowthRate,LossRate);
plot(sol.x,sol.y)
grid on
title('Logistic Growth with delayed impact of density')
xlabel('t')
ylabel('y')
end
function Change = logistic( t,Population,Z,Limit,MaxGrowthRate,LossRate )
Loss = Population * LossRate;
Change=Population*MaxGrowthRate*(1-Z/Limit)-Loss;
end

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