Clojure / core.matrix / initialize 2d array

Question

In clojure a 2-d array can be initialized with a value like so:

(defn vec2d
  "Return an x by y vector with all entries equal to val."
  [x y val]
  (vec (repeat y (vec (repeat x val)))))

Is there maybe a core.matrix built-in feature that would do the job?

Sam Estep · Accepted Answer · 2016-06-23 17:29:02Z

1

You can use new-matrix and fill:

(require '[clojure.core.matrix :as matrix])

(defn vec2d
  "Return an x by y vector with all entries equal to val."
  [x y val]
  (matrix/fill (matrix/new-matrix y x) val))

If you need the result to be a regular 2D Clojure vector, you can call to-nested-vectors on the result. At that point, though, you're probably better off just using the original solution from your question.

edited Jun 23, 2016 at 17:29

answered Feb 19, 2016 at 18:51

Sam Estep

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2 Comments

Anton Harald Over a year ago

Isn't new-matrix producing regular nested clojure vectors anyways? I discovered, that the following returns true: (let [mat (m/new-matrix 2 2)] (= (m/to-nested-vectors mat)) mat))

Sam Estep Over a year ago

@AntonHarald Yes, but fill does not.

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