Index exceeds the number of array elements. Index must not exceed 1.

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Haya Ali
Haya Ali 2023-2-6
评论： Haya Ali 2023-2-7
Please help to resolve the error.
clear all; close all; clc;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Simulation %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%value of constants
a1=0.7;a2=0.1;
omega1=20;omega2=40;
G=10;C12=0;C21=0.003;
dt=0.01; %step size
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
x1rec(1)=0.5;
y1rec(1)=0.5;
x2rec(1)=0.5;
y2rec(1)=0.5;
for i=2:1000
x1rec(i)=x1rec(i-1)+((a1-x1rec(i-1)^2-y1rec(i-1)^2)*x1rec(i-1)-omega1*y1rec(i-1)+G*C12*(x2rec(i-1)-x1rec(i-1)))*dt;
x2rec(i)=x2rec(i-1)+((a2-x2rec(i-1)^2-y2rec(i-1)^2)*x2rec(i-1)-omega2*y2rec(i-1)+G*C21*(x1rec(i-1)-x2rec(i-1)))*dt;
end

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采纳的回答

Voss
Voss 2023-2-6
The first time through the for loop, i is 2, so on the right-hand side of your equations you are accessing x1rec(1), x2rec(1), y1rec(1), and y2rec(1) and on the left-hand side of your equations you are setting x1rec(2) and x2rec(2).
Then, the second time through the for loop, i is 3, so you are accessing x1rec(2), x2rec(2), y1rec(2), and y2rec(2), but y2rec and y2rec only have one element each. That is, y1rec(2) and y2rec(2) haven't been calculated yet. This is the source of the error.
Maybe your code inside the loop should calculate y1rec(i) and y2rec(i) along with x1rec(i) and x2rec(i) somehow?

更多回答（1 个）

Jonas
Jonas 2023-2-6
Ran in:
you can initialize your array before the loop
a1=0.7;a2=0.1;
omega1=20;omega2=40;
G=10;C12=0;C21=0.003;
dt=0.01; %step size
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
numOfIterations=1000;
x1rec=zeros(1,numOfIterations);
y1rec=zeros(1,numOfIterations);
x2rec=zeros(1,numOfIterations);
y2rec=zeros(1,numOfIterations);
x1rec(1)=0.5;
y1rec(1)=0.5;
x2rec(1)=0.5;
y2rec(1)=0.5;
for i=2:numOfIterations
x1rec(i)=x1rec(i-1)+((a1-x1rec(i-1)^2-y1rec(i-1)^2)*x1rec(i-1)-omega1*y1rec(i-1)+G*C12*(x2rec(i-1)-x1rec(i-1)))*dt;
x2rec(i)=x2rec(i-1)+((a2-x2rec(i-1)^2-y2rec(i-1)^2)*x2rec(i-1)-omega2*y2rec(i-1)+G*C21*(x1rec(i-1)-x2rec(i-1)))*dt;
end
disp('finish')
finish

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