apache - Kalman filter - In java - operate method/API -

I have come in a very good tutorial for the speed of Klein's vehicle - "But, I still have to solve or recognize I am unable to "work" how can I use it? Is it using the operating API? Can someone give me a reference?

I have tried to use it: / P>

// x = A * x

p_noise x = A operate (x) .add (pNoise);

So what does it work for matrix and vector multiplication?

thanks

This clearly states on the comment of the previous line:

  //x = A * x + P_noise x = Aoparate (x) .add (pNoise);  

Given that the matrix is ​​one and X is a vector It is multiplication matrix-vector.