[ADMB Users] MAR(1) -needing Var operator and Kronecker product

[Mollie Brooks]

Hi ADMB community,
I'm working on an MAR(1) model. I need to compute the variance of the stationary distribution using the Vec operator and the Kronecker or direct matrix product. 
I'm tying to compute equation 17 from the paper "ESTIMATING COMMUNITY STABILITY AND ECOLOGICAL INTERACTIONS FROM TIME-SERIES DATA" by A.R. Ives, B. Dennis, K. L. Cottingham, and S.R. Carpenter (2003)
It defines these as follows...

"The operation Vec(A) creates a column vector out of any matrix A by stacking columns of A on top of each other, with the first column on the top and the last column on the bottom. The often-handy algebra of the Vec operator is reviewed by Searle (1982)"

"The Kronecker or direct matrix product of M and N is formed by scalar multiplying N in turn by each element of M and arranging the results into a large matrix."

I was wondering, has anyone in the community written code for these operators, and or coded an MAR(1) model? Would you be willing to share?
thanks,
Mollie

Mollie Brooks
Postdoctoral Researcher, Ponciano Lab
Biology Department, University of Florida
http://people.biology.ufl.edu/mbrooks


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