MATLAB: Index exceeds array dimensions when inputting time = 0

array dimensions

I don't understand why I get this error, what does it mean that my array range is [1-1]?
Warning:Discontinuities detected within algebraic loop(s), may have trouble solving
Error:An error occurred while running the simulation and the simulation was terminated
Caused by:
Index exceeds array dimensions. Index value 0 exceeds valid range [1-1] of array u.
Error in 'DCDC/Pbase' (line 3)
y = u(1-exp(-t/0.001));

Best Answer

  • From the description of the error message, it appears that you are trying to solve an ODE in Simulink. In that case, my guess is that you are trying to multiply u with the exponential term. Correct it like this
    y = u*(1-exp(-t/0.001));
    On the off-chance that 'u' is the unit step function, you can use heaviside function(): https://www.mathworks.com/help/releases/R2020a/symbolic/heaviside.html