Jacobian with lsode

[Alban Berg]

Hi all, 

nice forum. I am an Octave newbie but I guess my question is a bit silly. 
I want to obtain the values for the jacobian at the solutions given by lsode
for a certain function which I have already defined, let us say, as xdot =
myfunction(x, t). 
So, what I do is call x = lsode(["myfunction"; "j"], x0, t) having defined
x0 and t. So, my question is : 
do I have to define a function  jac = myj(x, t) and then run x =
lsode(["myfunction"; "myj"], x0, t)
 or does Octave compute the analytical/numerical jacobian itself? 
Many thanks.

Alban
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