Nothing

```
#' @title Constructs the (co)variance matrix for y
#'
#' @description
#' Constructs the (co)variance matrix for y.
#'
#' @param Z The incidence matrix for the random effects column binded with the Cholesky of the GRM
#' @param RandC The number of columns in the two matrices combined in Z.
#' @param ratio The ratios between random effect variances and the residual variance.
#'
#' @author Lars Ronnegard
#'
constructV <-
function(Z, RandC, ratio) {
V <- diag(nrow(Z))
indx <- 1
for (i in 1:length(ratio)) {
Z.tmp <- Z[,indx:(indx + RandC[i] - 1)]
indx = indx + RandC[i]
V <- V + tcrossprod(Z.tmp) * ratio[i]
}
return(V)
}
```

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