how to get value from a function that returns object in kotlin

Question

I am using math commons library but it turns out that when I want a function to return an Double, the intellij idea automatically corrects it to an object.

import org.apache.commons.math3.distribution.TDistribution


// TDistribution  --> It doesn't allow me to change to Double
fun calculo(a:Double): TDistribution {

    val distf = TDistribution(28.0,a)
    return distf
}

fun main(args: Array<String>){

    val ko = calculo(0.95)
    println(ko)
}

return it

org.apache.commons.math3.distribution.TDistribution@404b9385

Andrew Churilo · Accepted Answer · 2019-04-03 16:41:38Z

1

Your function returns TDistribution. To return Double you need something like this:

fun calculo(a:Double): Double {
    val distf = TDistribution(28.0,a)
    return distf.getNumericalMean()
}

fun main(args: Array<String>) {
    val ko = calculo(0.95)
    println(ko)
}

answered Apr 3, 2019 at 16:41

Andrew Churilo

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2 Comments

royer Over a year ago

hello, but for some reason it returns 0.0, do you know what I'm wrong about?

Andrew Churilo Over a year ago

@royer It is another issue. I suggest you to create a new question.

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