[Bayes++] How to specify the Jacobian of a Linrz_uncorrelated_observe_model

[<inn...@gm...>]

Hi,

If I'd like to design a class inheriting Linrz_uncorrelated_observe_model to
describe a pinhole model, how would I assign the values of Hx Jacobian
matrix? I thought the Jacobian depends on where you linearize the
observation function which means it is related to the values of the state
vector when you linearize it. But in the PV sample code I just see things
like:
     Hx(0,0) = 1;
     Hx(0,1) = 0.;  and these are not time-varying.
There must be something wrong in my understanding.  Would anyone help?

Best,
Wei-chun