Nothing
blkdiag <- function(A,B){
dimA = dim(A)
dimB = dim(B)
C = array(0,dimA+dimB)
C[1:dimA[1],1:dimA[2]] = A
C[dimA[1]+(1:dimB[1]),dimA[2]+(1:dimB[2])] = B
return(C)
}
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