Index exceeds the number of array elements (1).

clc;clear;
tf=10;
n=1;
t(n)=0.1; 
dt=0.1;
G1(n)=1; G2(n)=0; G3(n)=-1; G4(n)=0;
m(n,:)=[1 0 -1 0];
while t(n)<=tf
    m(n+1,:)=m(n,:)+slope(t(n),m(n,:))*dt;
    n=n+1;
end

It shows me like Index exceeds the number of array elements (1)

Error in cars (line 8)

while t(n)<=tf

and this is my fucntion.

function [out] = slope(t,G)
k1=10;k2=20;m1=2;m2=4;
v1=G(1); x1=G(2);v2=G(3);x2=G(4);
out(1)=(-k1*x1+k2*(x2-x1))/m1;
out(2)=v1;
out(3)=-k2*(x2-x1)/m2;
out(4)=v2;
end

why? how I can fix it?

Thank you

Answer 1

[Walter Roberson]

You only assign to t(n) when n is 1, so t(1) exists but no other t location. You then increase n to 2 and expect t(2) to exist.

[Walter Roberson]

t(n) = t(n-1)+dt