How to call differential equations inside function, and solve it ?
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I am having a code, which has symbolic variables. First,I am creating a system of coupleld differential equations through loop and then applying ODE15S to solve it. The equations are(one of the case)
function dCdT =solveode(t,C,A,T,L.......)
dCdt=zeros(6,1);
dCdT(1)=-C(1)*((3*A)/500 + (3*L)/1000 + (3*T)/500);
dCdT(2)=(3*C(1)^2)/500 - C(2)*((9*A)/1000 + (3*L)/1000 + (3*T)/500);
dCdT(3)=(3*C(1)*C(2))/1000 - C(3)*((3*A)/250 + (3*L)/1000 + (3*T)/500);
dCdT(4)=(3*C(2)^2)/1000 - C(4)*((3*A)/250 + (3*L)/1000 + (3*T)/500) + (9*C(1)*C(3))/500 + (3*C(1)*C(4))/500;
dCdT(5)=(3*C(1)*C(2))/250;
dCdT(6)=(3*C(2)^2)/500;
end
But these i have written manually. But i want to call them through a loop inside the function. I am trying to do this because, these set of differential equations would vary according to some other variable. Can some one suggest how to acheive this ?
3 Comments
madhan ravi
on 11 Jan 2019
ok it's good that you have asked a new question but there is no need to close this question, leave it open.
Answers (1)
madhan ravi
on 9 Jan 2019
Edited: madhan ravi
on 9 Jan 2019
for A=A
ode45(...) so A changes in every iteration likewise vary the other parameters too
end
3 Comments
madhan ravi
on 9 Jan 2019
See https://www.mathworks.com/matlabcentral/answers/436035-function-with-different-parameters#answer_352662 the parameter e changes in each iteration likewise you can adapt it here for instance A , L or whatever.
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