Hello, I want to make function Runge-Kutta orde 4 with equation depend on time, but in MATLAB i get some error
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cindyawati cindyawati
il 19 Mag 2023
Commentato: Cris LaPierre
il 20 Mag 2023
I want to use this equation with runge-kutta orde 4
function M1 =fRK4M1(M1)
%M1 =M1(j)+1./(1+exp(-T(j)));
m1 = (50*M1(j+1)*(1-(M1(j+1)/75))-2*(10^-4)*M1(j+1)*M1(j+1)-M1(j+1)*((5*10^-4).*M2(j+1))-((10-3)*(10^-4)*M1(j+1)*M3(j+1))-((100-10)*0.1*M1(j+1)*O(j+1))-((10^-3)*M1(j+1)));
M1 = dt *m1;
end
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Cris LaPierre
il 19 Mag 2023
You have not defined j, so in MATLAB, by default that letter is used to create complex numbers. As the error message states, your index must be positive integers.
j+1
a=1:5;
a(j+1)
2 Commenti
cindyawati cindyawati
il 20 Mag 2023
Modificato: Cris LaPierre
il 20 Mag 2023
Cris LaPierre
il 20 Mag 2023
Keep in mind that MATLAB is case sensitive. T and t are different variables.
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