c
org.apache.spark.sql.delta.expressions.HilbertUtils
HilbertMatrix
Companion object HilbertMatrix
case class HilbertMatrix(n: Int, x2: Int, dy: Int) extends Product with Serializable
This is not really a matrix, but a representation of one. Due to the constraints of this system the necessary matrices can be defined by two values: dY and X2. DY is the amount of right shifting of the identity matrix, and X2 is a bitmask for which column values are negative. The toString method is overridden to construct and print the matrix to aid in debugging. Instead of constructing the matrix directly we store and manipulate these values.
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- new HilbertMatrix(n: Int, x2: Int, dy: Int)
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- def transform(e: Int): Int
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- val x2: Int