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> sum(2,7,5)
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[1] 14
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> x
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[1] 2 NA 3 1 4
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> sum(x) # if any element is NA or NaN, result is NA or NaN
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[1] NA
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> sum(x, na.rm=TRUE) # this way we can ignore NA and NaN values
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[1] 10
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> mean(x, na.rm=TRUE)
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[1] 2.5
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> prod(x, na.rm=TRUE)
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[1] 24 |