unit of timespan of command simin in matlab -

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can guide me unit of parameter 'timespan' of simin command in matlab.

 [t,x,y1, y2, ..., yn] = sim(model,timespan,options,ut)

i think can consider units choose, provided make other variables , parameters consistent choice.

for example if modelling simple de like:

d2x/dt^2 = ax + b dx/dt + c

you may use "x" in meters , "t" in seconds, imply "a" given in sec^(-2), "b" in sec^(-1) , "c" in meters/second^2.

but valid take "x" in km , "t" in years, provided gave constants a, b , c (and initial conditions) in appropriate units.

in other words, it's not question of right or wrong units in dynamical system this, it's question of consistent or inconsistent units.


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