Not enough input arguments.

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nune pratyusha 2022-6-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1740345-not-enough-input-arguments

编辑： Stephen23 2022-6-15

i am getting error like:

>> run_Lp

xstart =

0 0 1

Not enough input arguments.

Error in l_ext (line 11)

f(2)=-x(1).*x(3)+R*x(1)-x(2);

Error in odearguments (line 90)

f0 = feval(ode,t0,y0,args{:}); % ODE15I sets args{1} to yp0.

Error in ode45 (line 106)

odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);

Error in lya (line 19)

[T,Y] = ode45(rhs_ext_fcn,[t t+stept],x,R);

Error in run_Lp (line 9)

lk= lya(n,rhs_ext_fcn,tstart,stept,tend,xstart,R);

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Sam Chak 2022-6-14

Guess you want to find the Lyapunov exponents of the Lorenz system?

nune pratyusha 2022-6-15

yes, I want lyapunov exponent v/s parameters plot so, i am trying it

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回答（1 个）

Jan 2022-6-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1740345-not-enough-input-arguments#answer_985780

在 MATLAB Online 中打开

Do not provide parameters as appended variables in the ODE45 call:

% In lya:
[T,Y] = ode45(rhs_ext_fcn,[t t+stept],x,R);
%                                       ^  nope

Use an anonymous function to provide parameters:

% in run_Lp:
% Nope: rhs_ext_fcn = @l_ext;
R_max=10; 
R_min=1; nk=10; tstart=0; stept=0.5; tend=20; xstart=[0 0 1]
R_step=(R_max-R_min)/nk;
R=R_min;
rhs_ext_fcn = @(x, t) l_ext(x, t, R);

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nune pratyusha 2022-6-15

i changed the code but i didn't get any output

function run_Lp(n,rhs_ext_fcn,tstart,stept,tend,xstart,nk);

figure()

hold on;

n=3;

R_max=10;R_min=1;nk=10;tstart=0;stept=0.5;tend=20;xstart=[0 0 1]

R_step=(R_max-R_min)/nk;

R=1:R_step:10; R =R+R_step;

rhs_ext_fcn=@(t,x) l_ext(t,x,R);

while R<=R_max

lk= lya(n,rhs_ext_fcn,tstart,stept,tend,xstart);

R =R+R_step;

plot(R,lk);

end

Stephen23 2022-6-15

编辑：Stephen23 2022-6-15

在 MATLAB Online 中打开

@nune pratyusha: the WHILE loop never runs.

Consider your variables:

R_max =
    10
R =
    1.9000    2.8000    3.7000    4.6000    5.5000    6.4000    7.3000    8.2000    9.1000   10.0000   10.9000

which you use on this line:

while R<=R_max

The WHILE documentation states "An expression is true when its result is nonempty and contains only nonzero elements (logical or real numeric). Otherwise, the expression is false."

Question: are all of the expression elements you provide to WHILE true?

Answer: no (because 10.9 is greater than 10, so that last element will be false).

So your WHILE loop never runs.

I doubt that R should be a vector.

I strongly recommend that you have one assignment per line, and consistently align your code.

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