relfactor {pedigreemm} | R Documentation |
Relationship factor from a pedigree
relfactor(ped, labs)
ped |
a pedigree that includes the individuals who occur in labs |
labs |
a character vector or a factor giving the labels to
which to restrict the relationship matrix. If labs is a
factor then the levels of the factor are used as the labels.
Default is the complete set of labels in the pedigree. |
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
## Example from chapter 2 of Mrode (2005) ped <- pedigree(sire = c(NA,NA,1, 1,4,5), dam = c(NA,NA,2,NA,3,2), label= 1:6) (fac <- relfactor(ped)) crossprod(fac) # the relationship matrix