Nothing
blkdiag <- function(A,B){
if(is.null(A) & is.null(B)) C = NULL
else if(!is.null(A) & is.null(B)) C = A
else if(is.null(A) & !is.null(B)) C = B
else{
A = as.matrix(A); B = as.matrix(B)
dimA = dim(A)
dimB = dim(B)
C = array(0,dimA+dimB)
if(prod(dimA)>0) C[1:dimA[1],1:dimA[2]] = A
if(prod(dimB)>0) C[dimA[1]+(1:dimB[1]),dimA[2]+(1:dimB[2])] = B
}
return(C)
}
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