MATLAB: Error using DynamicSystem/lsim

MATLAB

0 down vote favorite I am running a dynamic system but I got an error saying:
Error using DynamicSystem/lsim (line 84)
    When simulating the response to a specific input signal, the input data U must be a matrix of numeric values with at least two rows
    (samples) and without any NaN or Inf.
Error while evaluating UIControl Callback
My code is
[vabls.ResponseYdata vabls.ResponseXdata] = lsim(vabls.ctf,vabls.numinput,vabls.tset);
My U and T are both same as 1×501 sym and 1×501 double. My sys is
             814500
    ------------------------
    s^2 + 361.2 s + 8.145e05
where numerator is [0,0,814500] and deniminator is [1,361.2000,8.1450e+05]

Best Answer

‘My U and T are both same as 1x501 sym and 1x501 double.’
They should both be double. Neither should be sym.
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