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A Java API I am Clojure interoping with requires that I pass it a 2d array of doubles; double[][]. How do I create a primitive 2d array of doubles in Clojure? I am looking for something like this
(double-array-2d [[1 2] [3 4]])
This function would have a Java return type of double[][].
973
Java Two Dimensional Array of Primitive Type Arrays are a collection of elements that have similar data types. Hence, we can create an array of primitive data types as well as objects. A 2D array of a primitive data type in Java (let's say int) is simply an array of Integer arrays.
Like the one-dimensional arrays, two-dimensional arrays may be initialized by following their declaration with a list of initial values enclosed in braces. Ex: int a[2][3]={0,0,0,1,1,1}; initializes the elements of the first row to zero and the second row to one. The initialization is done row by row.
You can't "add" values to an array as the array length is immutable. You can set values at specific array positions.
Try this:
(into-array (map double-array [[1 2] [3 4]])) Try this:
(defn double-array-2d [coll] (let [w (count coll) h (apply max (map count coll)) arr (make-array Double/TYPE w h)] (doseq [x (range w) y (range h)] (aset arr x y (double (get-in coll [x y])))) arr)) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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