'Error - Array indices must be positive integers or logical values

Hey could anyone help me to figure out why i would be getting this error?

Answer 1

[Walter Roberson]

t1 = 0;
t2 = 0.04;

So t2-t1 is 0.04 - 0 = 0.04

x_2 = v_x1(t2-t1)+x_1

That code attempts to index v_x1 at location t2-t1 which is v_x1 at index 0.04 which is not valid.

Reminder: MATLAB has absolutely no implied multiplication. None . Not even in the Symbolic Engine. If you want to multiply v_x1 by something then you need .* or * as appropriate.