fixm creates a square matrix with 3's in the diagnals and off-diagonals to quickly specify a fixed constraint in the Gtc argument of the vsm function.
Arguments
- x
integer specifying the number of traits to be fitted for a given random effect.
- reps
integer specifying the number of times the matrix should be repeated in a list format to provide easily the constraints in complex models that use the ds(), us() or cs() structures.
Value
- $res
a matrix or a list of matrices with the constraints to be provided in the Gtc argument of the vsm function.
References
Covarrubias-Pazaran G (2016) Genome assisted prediction of quantitative traits using the R package sommer. PLoS ONE 11(6): doi:10.1371/journal.pone.0156744
Author
Giovanny Covarrubias-Pazaran