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我试图解决在Matlab延迟微分方程:解决延迟微分方程在Matlab重现公布的数字
mRNA' = k0 + k*Activator(t-delta_t) - gamma*mRNA(t)
在这个公式中
k0 is constant, representing basal transcription (production) of mRNA;
k is another constant parameter representing the rate of Activator stimulated mRNA production that is dependent on the amount of Activator at time t-delta_t;
gamma is another constant representing the rate of degradation of mRNA
mRNA at time t is the amount of mRNA at time t.
我想模拟这个方程,以便我可以弄清楚它是如何表现不同的参数(即不同的时间延迟,与ODE的比较等)。我遵循代码示例here,并取得了有限的成功。
到目前为止我的代码是:
function General_mRNA_DDE
sol = dde23(@General_mRNA_DDE2,2,@input_function,[0,5])
figure;
plot(sol.x,sol.y)
function dydt = General_mRNA_DDE2(t,y,z)
k0=1;
k=10;
mRNA0=1; %initial concentration of mRNA
gamma=0.1;
z
dydt= [k0 + k*z - gamma*y];
end
function hist = input_function(t)
hist = 1;
end
end
但是我有什么本质上看起来像一个非常陡峭的指数曲线。这里就是我试图重现:
从本文DOI:10.15252/msb.20177554(http://msb.embopress.org/content/msb/13/5/928.full.pdf)
没有任何人有任何建议对我来说,准确地再现人物?
预先感谢