Subscripted assignment dimension mismatch.

i'm trying to write this system:

a=1.07;
b=0.3;
k=2;
x1=[];
x2=[];
x3=[];
x=[];
f(x)=[1-a*((x1)^2)*(k) ; 0 ;0 ];
A=[0 1 0;0.3 0 1;-0.3 0 0];
x=[x1 ; x2 ; x3 ];
k=lenght(x); 
x(k+1)= Ax(k)+f(x(k));
figure;
plot(x,k)

Answer 1

[Caglar]

First of all, f(x) is wrong.

x=[];
f(x)=[1-a*((x1)^2)*(k) ; 0 ;0 ];

x is empty, how can it be an indice? And then, your calculation (right hand side) yields 2-d data. Left side must comply.

x=[1];
f(x,:)=[1-a*((x1)^2)*(k) ; 0 ;0 ];

[sihem bk]

thank you for the first;i put x empty because when i execute the code withn puting the type of x i get error . but really i don't know how to declare x

[Caglar]

can you write what is your final goal? As @star strider said its not clear.

[sihem bk]

mmy goal is to plot this :

and i'm starting from this