Working with Incanter Datasets - Clojure Data Analysis - page 166

Saving datasets to CSV and JSON
Once you've done the work of slicing, dicing, cleaning, and aggregating your datasets,
you might want to save them. Incanter by itself doesn't have a good way to do this.
However, with the help of some Clojure libraries, it's not dificult at all.
Getting ready
We'll need to include a number of dependencies in our project.clj ile:
(defproject inc-dsets "0.1.0"
:dependencies [[org.clojure/clojure "1.6.0"]
[incanter "1.5.5"]
[org.clojure/data.csv "0.1.2"]
[org.clojure/data.json "0.2.5"]])
We'll also need to include these libraries in our script or REPL:
(require '[incanter.core :as i]
'[incanter.io :as i-io]
'[clojure.data.csv :as csv]
'[clojure.data.json :as json]
'[clojure.java.io :as io])
Also, we'll use the same data that we introduced in the Selecting columns with $ recipe.
How to do it…
This process is really as simple as getting the data and saving it. We'll pull out the data for the
year 2000 from the larger dataset. We'll use this subset of the data in both the formats here:
(def data2000
(i/$ [:Indicator-Code :Indicator-Name :2000] chn-data))
Saving data as CSV
To save a dataset as a CSV, all in one statement, open a ile and use clojure.data.csv/
write-csv to write the column names and data to it:
(with-open [f-out (io/writer "data/chn-2000.csv")]
(csv/write-csv f-out [(map name (i/col-names data2000))])
(csv/write-csv f-out (i/to-list data2000)))