Forward reference error in a for loop Scala

Question

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?

Code that compiles is more useful to demonstrate your issue. — som-snytt, Jul 25 '15 at 14:21

score 1 · Accepted Answer · answered Jul 25 '15 at 13:30

1

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
}

answered Jul 25 '15 at 13:30

yanana

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Thank you @yanana , but when i want to assign values to every element of this vector, it shows " Too many argument for method theta (Int)" – AHAD Jul 25 '15 at 14:08
How do you assign values to the vector? – yanana Jul 25 '15 at 18:19

Forward reference error in a for loop Scala

1 Answers1