Relationship factor from a pedigree
1  relfactor(ped, labs)

ped 
a pedigree that includes the individuals who occur in 
labs 
a character vector or a factor giving the labels to
which to restrict the relationship matrix. If 
Determine the right Cholesky factor of the relationship matrix for the
pedigree ped
, possibly restricted to the specific labels that
occur in labs
.
an upper triangular, sparse (right) Cholesky factor 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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