Too many input arguments, which arguments should I remove?

Question

Dursman Mchabe 2018-10-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/425721-too-many-input-arguments-which-arguments-should-i-remove

评论： Walter Roberson 2018-10-24

my_odesloop.m

Hi all, on the attached code, I am trying to use a for-loop and ode45 to solve odes and an algebraic equation in 31 iterations. However, I get an error message

Error using my_odesloop>odes
Too many input arguments.
Error in my_odesloop>@(t,y)odes(t,y,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z) (line 46)
    sol(j)   = ode45(@(t,y) odes(t,y,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z),t,y0);
Error in odearguments (line 90)
f0 = feval(ode,t0,y0,args{:});   % ODE15I sets args{1} to yp0.
Error in ode45 (line 115)
  odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);
Error in my_odesloop (line 46)
    sol(j)   = ode45(@(t,y) odes(t,y,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z),t,y0);

I don't know which arguments to remove.

Please help.

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KSSV 2018-10-24

YOur code is very buggy.......need lot's of changes.....what you are trying actually?

Dursman Mchabe 2018-10-24

Thanks a lot for the response KSSV. I am trying to use a for-loop and ode45 to solve odes and an algebraic equation. The odes are in lines 60 to 82. The algebraic equation is nested in lines 49 to 51.

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Answer 1

Walter Roberson 2018-10-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/425721-too-many-input-arguments-which-arguments-should-i-remove#answer_343092

Your function line for odes needs to list A, B, C, and so on.

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Torsten 2018-10-24

Adopt the example "ODE with Time-Dependent Terms" under

https://de.mathworks.com/help/matlab/ref/ode45.html

to your case.

Best wishes

Torsten.

Walter Roberson 2018-10-24

在 MATLAB Online 中打开

Guessing:

   x0 = 9.46e-1;
   xin = x0;
   for j = 1:length(t)
      sol(j)   = ode45(@(t,y) odes(t,y,xin,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z),t,y0);
       for i = 1:length(t)
              x(i) = fsolve(@(x) x + 2.* e(j) - ((c(j).* A.*x)/(x.^2 + A.*x + A*B))- 2.*((c(j).*A*B)/(x.^2 ...
              + A.*x + A*B))-((d(j).*M.*x)/(x.^2 + M.*x + M*N))- 2.*((d(j).*M.*N)/(x.^2 ...
              + M.*x + M*N))- Y./x, x0);
       end
      plot(t,sol) 
      xin = x(j);   %complete guess
   end
  end
function dydt = odes(t,y,x,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z)
a = y(1);
b = y(2);
c = y(3);
d = y(4);
e = y(5);
f = y(6);
g = y(7);
dydt = zeros(7,1);
dydt(1) = (1 /J).* (K.* L - K.* a ) - ((a.* E.* F - G.* ((c.* (x).^2)/((x).^2 + A.* (x) + A.* B))) / ( (1/H) + G/ ((1 + C.* e / (D.* c)).* I)));
dydt(2) = (1 /J).* (K .* R - K .* b) - (P .* (1 + C  * e / (O .* d)) .* (b .* E .* F / Q - ((d.* (x(i)).^2)/((x).^2 + M.* (x) + M.* N))));
dydt(3) = ((a.* E.* F - G.* ((c.* (x).^2)/((x).^2 + A.* (x) + A.* B))) / ( (1/H) + G/ ((1 + C.* e / (D.* c)).* I))) -  (Z .* 1.62e-3 .* exp(-5152 / F) .* ( (e .* ((c.* A .* B)/((x).^2 + A .* (x) + A .* B)) / S) - 1).^3 / T);
dydt(4) =  (- U .* V .* W .* f .* (x) .* (1 - (X .* (x))/(1+ X .* (x)))) - (P .* (1 + C  * e / (O .* d)) .* (b .* E .* F / Q - ((d.* (x).^2)/((x).^2 + M.* (x) + M.* N))));
dydt(5) = (- U .* V .* W .* f .* (x) .* (1 - (X .* (x))/(1+ X .* (x)))) - (Z .* 1.62e-3 .* exp(-5152 / F) .* ( (e .* ((c.* A .* B)/((x).^2 + A .* (x) + A .* B)) / S) - 1).^3 / T);
dydt(6) =  (- U .* V .* W .* f .* (x) .* (1 - (X .* (x))/(1+ X .* (x))));
dydt(7) =  (Z .* 1.62e-3 .* exp(-5152 / F) .* ( (e .* ((c.* A .* B)/((x).^2 + A .* (x) + A .* B)) / S) - 1).^3 / T);
dydt = [dydt(1),dydt(2),dydt(3),dydt(4),dydt(5),dydt(6),dydt(7)];
end