# How to plot system of fractional delay differential equations

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RAMESH P on 5 May 2019
Edited: Rik on 29 Nov 2021 at 9:46
This question was flagged by Walter Roberson
Let us consdier the system of fractional order delay differential equation
D^[alpha} x(t)= a*x(t) ( 1- x(t)/k ) - (b* x(t)* y(t-tau) ) / ( 1+c* x(t) );
D^[alpha} y(t)= ( b* x(t)* y(t-tau) ) / ( 1+c* x(t) )-d y(t);
tau=0.5; a=1; k=2; b=0.5; c=1.5; [x(t), y(t)]=[2,1] for all t in [-0.5, 0].
How to plot the above system?

wang zhiming on 11 Aug 2019
Edited: wang zhiming on 11 Aug 2019
I set a=1, k=2, b=0.5, c=1.5, d=1.2, and alpha=0.95, then get the following plot. Is it right? Tamil M on 22 Oct 2021
Prof wang zhiming, please help me in writing matlab coding for the above fractional differential equation. And tell me how will you got this graph

wang zhiming on 19 Aug 2019
The alpha value is the order of your equations. About the matlab code you can read the paper: A PREDICTOR-CORRECTOR SCHEME FOR SOLVING NONLINEAR DELAY DIFFERENTIAL EQUATIONS OF FRACTIONAL ORDER. SACHIN BHALEKAR, VARSHA DAFTARDAR-GEJJI.
RAMESH P on 20 Aug 2019
I have read the article ''A PREDICTOR-CORRECTOR SCHEME FOR SOLVING NONLINEAR DELAY DIFFERENTIAL EQUATIONS OF FRACTIONAL ORDER''. I have some confusion on ploting the system of equation. Please send me the matlab code for the same. Otherwise give your mail id sir. I will explian my dobuts detailly via mail. My mail id is '' []@gmail.com''