How to solve two differential equations

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Mohammad Sh
Mohammad Sh 2021-12-27
编辑： Torsten 2021-12-27
I wrote this to solve two differential equations but does'nt work
clc
clear
syms B(t) S(t)
K=0.000001;
k=0.3;
DB=diff(B);
DS=diff(S);
eq1=DB==k*B*S/(K+DS);
eq2=DS==-0.75*k*B*S/(K+S);
cond=[S(0)==5,B(0)==0.05];
[B,S]=dsolve([eq1,eq2],cond)
  1 个评论
Torsten
Torsten 2021-12-27
编辑：Torsten 2021-12-27
I doubt there is an analytical solution for your system because of the S and DS-terms in the denominators.
Use one of the numerical integrators instead, e.g. ODE45, ODE15S.

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