Multi tool use

How to make empty lists in MATLAB Live Script and append to them both outside of a loop and inside one? [closed]

The three list I want to make are the following and I'm not sure how it's done in MATLAB.

na =
nb =
t


Outside of the list I want to append the follwoing:

NA = input('Enter intial number of atoms of A > ');
NB = input('Enter intial number of atoms of B > ');
tau_a = input('Define decay constant of A >');
tau_b = input('Define decay constant of B >');
time = input('the total time >');
dt = input('Define time increment >');


I've to append the values like so:

na = [na, NA]
nb = [nb; NB]
t = [t, 0]


Finally, inside the loop I have tried appending values like this:

for i = int16(time/dt)
nai = na[i]-(na[i]/tau_a)*dt
nbi = nb[i]+((na[i]/tau_a)-(nb[i]/tau_b))*dt
ti = t[i]+dt
na = [na, nai]
nb = [nb, nbi]
t = [t, ti]
end


But it is not working. It does not want to append the values. The error messages I get are:

"Parse error at '[': usage might be invalid MATLAB syntax."

"The variable 'na, nb, and t' appears to change size on every loop iteration. Consider preallocating for speed."

"Unbalanced or uexpected parenthesis or bracket"

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