Random numbers: Difference between revisions
→{{header|Scala}}: migrate to Scala 2.13
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(→{{header|Scala}}: migrate to Scala 2.13) |
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<lang scala>List.fill(1000)(1.0 + 0.5 * scala.util.Random.nextGaussian)</lang>
===Academic===
<lang scala>
object RandomNumbers extends App {
def randomNormal = 1.0 + 0.5 * scala.util.Random.nextGaussian▼
val distribution: LazyList[Double] = {
▲ def randomNormal: Double = 1.0 + 0.5 * scala.util.Random.nextGaussian
def normalDistribution(a: Double): LazyList[Double] = a #:: normalDistribution(randomNormal)
}▼
normalDistribution(randomNormal)
/*▼
}
* Let's test it▼
▲ /*
*/
def calcAvgAndStddev[T](ts: Iterable[T])(implicit num: Fractional[T]): (T, Double) = {
val mean: T =
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// Root of mean diffs
val stdDev = Math.sqrt(ts.map { x =>
val diff = num.toDouble(num.minus(x, mean))
diff * diff
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}
println(calcAvgAndStddev(
▲}
</lang>
=={{header|Scheme}}==
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