I have attached a file of problem which I have to code in Matlab.
If delay is constant, then i can code it using dde23 but in the case when tau(t) = exp(t)/(1+exp(t)). We will have to use ddesd function to solve but how to code using ddesd .
Yo can try, either first or second order of Pade Approximation.
Dear Francisco J. Sanchez Careaga
Thank you for your response . But my question is related to coding of time varying delay differential equation(which is added in file) using inbuilt function ddesd in MATLAB.
Hi, the calling sequence of ddesd is the following one:
sol=ddesd(ddefun,delays,history,tspan)
ddefun has the following form:
dydt=ddefun(t,y,Z)
where t and y are classical entries while Z(:,j) approximates y(d(j)) where the delay d(j) is component j of delays(t,y).
You can simply refer to the MATLAB help for more details.
In brief, the delays (possibly multiple) have to be defined in parameter delays.
Xiao Guo Yes, first create a function for time-varying delays then call it in ddesd solver. For example,
d = delays(t,y)
d = 1- e^{t}/(1+e^{t})
now, call it in ddesd
sol = ddesd(@ddefun, @delays, @history, tspan)
Hope this will help you...
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