How to create and use a multi-dimensional array in Scala?

Question

How do I create an array of multiple dimensions?

For example, I want an integer or double matrix, something like double[][] in Java.

I know for a fact that arrays changed in Scala 2.8 and that the old arrays are deprecated, but are there multiple ways to do it now and if yes, which is best?

score 59 · Accepted Answer · edited Jun 07 '14 at 19:30

59

Like so:

scala> Array.ofDim[Double](2, 2, 2)
res2: Array[Array[Array[Double]]] = Array(Array(Array(0.0, 0.0), Array(0.0, 0.0)), Array(Array(0.0, 0.0), Array(0.0, 0.0)))

scala> {val (x, y) = (2, 3); Array.tabulate(x, y)( (x, y) => x + y )}
res3: Array[Array[Int]] = Array(Array(0, 1, 2), Array(1, 2, 3))

edited Jun 07 '14 at 19:30

om-nom-nom

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answered Mar 04 '10 at 19:52

retronym

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2

Is `Array[Array[Int]]` equivalent to `int[][]` in Java? cause I heard vicious rumors otherwise http://stackoverflow.com/questions/6090684 – Elazar Leibovich May 23 '11 at 09:02

score 14 · Answer 2 · edited Dec 22 '11 at 08:10

14

It's deprecated. Companion object exports factory methods ofDim:

val cube = Array.ofDim[Float](8, 8, 8)

edited Dec 22 '11 at 08:10

JMax

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answered Jul 30 '10 at 19:46