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...x0_ numeric( 0) test> x0[1]_ NA test> mode( x0) [1] "logical" Similar things happen with vectors of mode 'complex' and even 'character': test> xc0_ complex( 0) test> xc0[1]_ 3 test> mode( xc0) [1] "numeric" # should be 'complex' test> xch0_ character(0) test> xch0[ 1]_ 3 test> mode( xch0) [1] "numeric" Intriguingly, something strange happens even with lists: test> xl1_ list( 1) test> xl1[1]_ 3 test> xl1 [[1]] [1] 3 test> xl0_ list() test> xl0[1]_ 3 Error: (list) object cannot be coerced to vector type...