bldiag | R Documentation |
Function to construct a block diagonal matrix from (a list of) matrices.
bldiag(..., order)
... |
individual matrices or a list of matrices. |
order |
optional argument to specify a variable based on which a square block diagonal matrix should be ordered. |
Posted to R-help by Berton Gunter (2 Sep 2005) with some further adjustments by Wolfgang Viechtbauer
rma.mv
for the model fitting function that can take such a block diagonal matrix as input (for the V
argument).
blsplit
for a function that can split a block diagonal matrix into a list of sub-matrices.
### copy data into 'dat' dat <- dat.berkey1998 dat ### construct list with the variance-covariance matrices of the observed outcomes for the studies V <- lapply(split(dat[c("v1i","v2i")], dat$trial), as.matrix) V ### construct block diagonal matrix V <- bldiag(V) V ### if we split based on 'author', the list elements in V are in a different order than tha data V <- lapply(split(dat[c("v1i","v2i")], dat$author), as.matrix) V ### can use 'order' argument to reorder the block-diagonal matrix into the correct order V <- bldiag(V, order=dat$author) V
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