Function that computes the log likelihood of a state space model.
1 
y 
a vector, matrix, or time series of data. 
mod 
an object of class 
debug 
if 
The calculations are based on singular value decomposition.
Missing values are allowed in y
.
The function returns the negative of the loglikelihood.
The observation variance V
in mod
must be nonsingular.
Giovanni Petris GPetris@uark.edu
Durbin and Koopman, Time series analysis by state space methods, Oxford University Press, 2001.
dlmMLE
, dlmFilter
for the definition of
the equations of the model.
1  ## See the examples for dlmMLE 

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