Returns a dataset created by merging the given datasets and/or collections.
There must be the same number of rows in each dataset and/or collections.
Column names are not preserved in order to prevent naming conflicts.
Examples:
(use '(incanter core datasets))
(def cars (get-dataset :cars))
(def x (sel cars :cols 0))
(view (conj-cols cars cars))
(view (conj-cols cars x))
(view (conj-cols (range (nrow cars)) cars))
(view (conj-cols (range 10) (range 10)))
(view (conj-cols {:a 1 :b 2} {:c 1 :d 2}))
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