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Calculating dt inside a function

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Chris
Chris 2013-2-11
I want to calculate dt inside a function whose variable is t. I try doing as follows:
if t> 0
dt = t - told
end
told = t
inside the function but I receive the error "undefined variable or function 'told'". Is there a command that will store 'told' to be used at the next time step for the function or am I going about it the wrong way.

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Doug Hull
Doug Hull 2013-2-11
Can you pass told into the function?
If not, persistent might help you.
Look into the properties of functions and subfunctions here:

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