Signature Matrix Creation

gistfile1.scala

def createSignatureMatrix(characterMatrix: Array[Array[Int]], hashFunctions: List[HashFunction]): Array[Array[Int]] = {
    val signatureMatrix: Array[Array[Int]] = createEmptySignatureMatrix(hashFunctions.length, characterMatrix(0).length)
    characterMatrix.zipWithIndex.foreach { case (row, i) =>
      row.zipWithIndex.foreach { case (character, j) =>
        /* only apply hash functions if character is not 0 */
        if (character == 1) {
          hashFunctions.zipWithIndex.foreach { case (hasher, k) =>
            val hashedRowValue: Int = hasher.apply(i)
            if (isReplaceable(signatureMatrix(k)(j), hashedRowValue)) {
              signatureMatrix(k)(j) = hashedRowValue
            }
          }
        }
      }
    }
    signatureMatrix
  }