Nothing
diag_matlab(3)
diag_matlab(c(1,2,3))
diag_matlab(cbind(1,2,3))
diag_matlab(rbind(1,2,3))
diag_matlab(matrix(c(1, 2, 3),6,6))
# here is where the R default does something different
diag(cbind(1,2,3))
diag(rbind(1,2,3))
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