This is a code to be used with the BNT toolbox for matlab by Kevin Murphy. 
The original toolbox can be downloaded from (https://code.google.com/p/bnt/).
The plugin in this repository modifies the EM estimation procedure  
described in www.ai.mit.edu/~murphyk/Papers/learncg.pdf
The modifications allow to estimate the variance matrices $\Simga_i$
by assuming that $B_i$ is known but time-varying in the sense that
its value is a function of t, i.e. B_{i,t} in equation (1).

DEPENDENCIES
 
 Currently the dependencies are (a) BNT toolbox and (b) FEATHERSTONE toolbox:
(0.a) https://github.com/bayesnet/bnt.git
(0.b) http://royfeatherstone.org/spatial/v2/spatial_v2.zip

DOCUMENTATION 

If you want to understand the code in bnt_time_varying, you should understand
how to use the BNT and SpatialV2 libraries, that are used in all the code. 
Nice entry points for this libraries are: 
 * SpatialV2 : http://royfeatherstone.org/spatial/v2/index.html
 * BNT       : http://bnt.googlecode.com/svn/trunk/docs/usage.html