Inverse of the Relationship matrix from a pedigree
1  getAInv(ped)

ped 
a pedigree that includes the individuals who occur in 
Determine the inverse of the relationship matrix from a pedigree
ped
.
sparse matrix, inverse of the relationship matrix
2010. A.I. Vazquez, D.M. Bates, G.J.M. Rosa, D. Gianola and K.A. Weigel. Technical Note: An R package for fitting generalized linear mixed models in animal breeding. Journal of Animal Science, 88:497504.
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