A clojure library intended to bring functionality of dplyr to clojure.core.matrix.dataset.
Takes a vector of columns, and a corresponding filter predicate function taking the values of those columns and returning a boolean-like.
(filter-dataset test-ds1 ["a" "b" "c"] (fn [a b c] (and (> a b) (not (nil? c)))))left-join: takes all the rows on the left dataset and attempts to match them by the columns on the right dataset. If no match is found the row is filled with nils. If more than one match is found, more than one row is created, and the dataset is returned.
(left-join test-ds1 test-ds2 [:a])right-join: symmetrical to left-join.
(right-join test-ds1 test-ds2 [:a]inner-join: if no match is found in the other dataset, the row is simply dropped.
TODO: join on different column names using maps for equality group-by - summarize using functions order rows defining ordering function
The filter and join functions were started by my esteemed colleagues Tom Coupland and Antony Woods.
Copyright © 2017 FIXME
Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.