Not enough input arguments.

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nune pratyusha
nune pratyusha on 14 Jun 2022
Edited: Stephen23 on 15 Jun 2022
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);
>>
  3 Comments
nune pratyusha
nune pratyusha on 15 Jun 2022
yes, I want lyapunov exponent v/s parameters plot so, i am trying it

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Answers (1)

Jan
Jan on 14 Jun 2022
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);
  6 Comments
Stephen23
Stephen23 on 15 Jun 2022
Edited: Stephen23 on 15 Jun 2022
@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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