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breeze.linalg.functions.normalize.scala Maven / Gradle / Ivy
package breeze.linalg
import breeze.generic.UFunc
import breeze.linalg.operators.OpDiv
/**
* Normalizes the argument such that its norm is 1.0 (with respect to the argument n).
* Returns value if value's norm is 0.
*/
object normalize extends UFunc {
implicit def normalizeDoubleImpl[T, U>:T](implicit div: OpDiv.Impl2[T, Double, U], canNorm: norm.Impl2[T, Double, Double]):Impl2[T, Double, U] = {
new Impl2[T, Double, U] {
def apply(t: T, n: Double): U = {
val norm = canNorm(t, n)
if(norm == 0) t
else div(t,norm)
}
}
}
implicit def normalizeFloatImpl[T, U>:T](implicit div: OpDiv.Impl2[T, Float, U], canNorm: norm.Impl2[T, Float, Float]):Impl2[T, Float, U] = {
new Impl2[T, Float, U] {
def apply(t: T, n: Float): U = {
val norm = canNorm(t, n)
if(norm == 0) t
else div(t,norm)
}
}
}
implicit def normalizeInPlaceDoubleImpl[T, U>:T](implicit div: OpDiv.InPlaceImpl2[T, Double], canNorm: norm.Impl2[T, Double, Double]):InPlaceImpl2[T, Double] = {
new InPlaceImpl2[T, Double] {
def apply(t: T, n: Double): Unit = {
val norm = canNorm(t, n)
if (norm != 0)
div(t,norm)
}
}
}
implicit def normalizeInPlaceFloatImpl[T, U>:T](implicit div: OpDiv.InPlaceImpl2[T, Float], canNorm: norm.Impl2[T, Float, Float]):InPlaceImpl2[T, Float] = {
new InPlaceImpl2[T, Float] {
def apply(t: T, n: Float):Unit = {
val norm = canNorm(t, n)
if (norm != 0)
div(t,norm)
}
}
}
implicit def normalizeImpl[T, U>:T](implicit impl: Impl2[T, Double, U]):Impl[T, U] = {
new Impl[T, U] {
def apply(v: T): U = impl(v, 2.0)
}
}
implicit def normalizeIntImpl[T, U>:T](implicit impl: Impl2[T, Double, U]):Impl2[T, Int, U] = {
new Impl2[T, Int, U] {
def apply(v: T, n: Int): U = impl(v, n)
}
}
}
