Error in sym/subref

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Maria Ruiz
Maria Ruiz on 11 Nov 2021
Answered: Walter Roberson on 11 Nov 2021
%Indicate variables
x0 =1.25;
S0 =86.63;
P0 =0;
Kd = 0.0032;
a = 0.6212;
Yps = 0.5820;
Ki = 243.95;
c = 0.5557;
Ks = 0.0191;
d = 30.7600;
syms t S
mu = ((c*S)/Ks+S+(S^2/Ki))*(1-(-Yps*S+Yps*S0+P0/d));
m1 = exp(int(mu,0,t));
m2 = (-a*c/Yps)*((S+Yps*S^2-Yps*S*S0-P0*S)/Ks+S+(S^2/Ki));
%% 1st method ODE
x=linspace(0,0.5,50);
h=0.5;
f1= 86.63;
for i = 1:length(x)
f(i+1) = f(i) + h*(m1(i)*m2(i));
end
Index exceeds the number of array elements (1).
Error in sym/subsref (line 900)
R_tilde = builtin('subsref',L_tilde,Idx);

Answers (1)

Walter Roberson
Walter Roberson on 11 Nov 2021
m1 and m2 are scalar symbolic expressions that do not involve x.
They do involve S. perhaps you want to subs(m1, S, x(i)) ?

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