Index exceeds matrix dimensions when solving for ODE system.

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nanana sehaa
nanana sehaa 2017-9-27
评论： nanana sehaa 2017-9-27
Hi. Im trying to solve this system of equation. But it gives me this error. What does it mean and how to solve this? Thank you.
function dphidz = Pphiode(z,phi,Ro,Eta,Lambda)
Co=2.0-Ro-Ro^2; % Coriolis number
dphidz = [phi(2)
Ro.*(phi(1)^2+phi(2).*phi(5)-phi(3)^2+1)-Co*(phi(3)-1.0)
phi(4)
Ro*(2.0*phi(1)*phi(3) + phi(4)*phi(5))+Co*phi(1)
-2.0*phi(1)];
end
Error:
Trial>> Pphiode(20,2,-1,1,1)
Index exceeds matrix dimensions.
Error in Pphiode (line 3)
dphidz = [phi(2)
Let say
z=12, phi=1, R0=-1, Eta=0, Lambda=1

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采纳的回答

KSSV
KSSV 2017-9-27
The input
phi = 1 ;
should be a vector with elements 5. Try with:
phi = rand(5,1) ;
  2 个评论
nanana sehaa
nanana sehaa 2017-9-27
And how about this? Should i enter rand(5,1) for both phi0 and phiinf?
function bc = Pphibc (phi0,phiinf,Ro,Eta,Lambda)
bc = [phi0(1)-Lambda*phi0(2)
phi0(3)-Eta*phi0(4)
phi0(5)
phiinf(1)
phiinf(3)+1];
end

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