# na.fail() works Code na.fail(x) Condition Error in `na.fail()`: ! missing values in object # default print and str methods are useful Code h Output <hidden[4]> [1] xxx xxx xxx xxx --- Code h[0] Output <hidden[0]> --- Code str(h) Output hidden [1:4] xxx, xxx, xxx, xxx # default print method shows names Code h Output <hidden[3]> A B C xxx xxx xxx
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