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matrix

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Let's create a matrix with 3 rows and 4 coulmns.

scala> val matrix = Array.ofDim[Int](3, 4)
matrix: Array[Array[Int]] = Array(Array(0, 0, 0, 0), Array(0, 0, 0, 0), Array(0, 0, 0, 0))

scala> matrix(0)(2) = 42

scala> matrix
res1: Array[Array[Int]] = Array(Array(0, 0, 42, 0), Array(0, 0, 0, 0), Array(0, 0, 0, 0))