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Dataset from doc:

dataset = Dataset[{
   <|"a" -> 1, "b" -> "x" |>,
   <|"a" -> 2, "b" -> "y" |>,
   <|"a" -> 3, "b" -> "z" |>,
   <|"a" -> 4, "b" -> "x" |>,
   <|"a" -> 5, "b" -> "y" |>,
   <|"a" -> 6, "b" -> "z" |>}]

There is a built-in way to Divide all column by constant, i.e. 2:

dataset[Divide[#, 2] &, "a"]

If I want to Divide all values of "a" to corresponding values of "b" the naive way is as follows:

Normal[dataset[All, "a"]] / Normal[dataset[All, "b"]]

What are more natural ways to make such calculations, say, Division, between columns in Dataset?

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1 Answer 1

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Normal @ dataset[All, #a / #b&]

{1/("x"), 2/("y"), 3/("z"), 4/("x"), 5/("y"), 6/("z")}

Also:

Normal @ dataset[All, Apply[Divide]]
Normal[Divide @@@ dataset] 
Normal[Query[All, Divide @@ # &]@dataset]
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