What is the idiomatic way to obtain a sequence of columns from an incanter dataset?

Question

What's the best way to get a sequence of columns (as vectors or whatever) from an Incanter data set?

I thought of:

(to-vect (trans (to-matrix my-dataset)))

But Ideally, I'd like a lazy sequence. Is there a better way?

Answer 1

Use the $ macro.

=> (def data (to-dataset [{:a 1 :b 2} {:a 3 :b 4}]))
=> ($ :a data)  ;; :a column
=> ($ 0 :all data) ;; first row

=> (type ($ :a data))
clojure.lang.LazySeq