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scalavariablesscala-breeze

Forward reference error in a for loop Scala

This is a code that is written in Scala :

for (i <- 0 until 10) {
  if (i > 0) {
    val new = theta(i * 5)
  }
  // using variable new

  val theta = DenseVector.zeros[Int]((i + 1) * 10)
  // doing operations on theta
}

every iteration has own variables and order of variables can't change because between them doing some operations.

when i running this code it shows this error:

Wrong forward reference

how can i resolve this problem?

Solution

  • Replace theta before if expression by making theta method.

    def theta(i: Int) = DenseVector.zeros[Int]((i + 1) * 10)
for (i <- 0 until 10) {
  if (i > 0) {
    val new = theta(i * 5)
  }
  // doing operations on theta
}