如何调用此Haskell函数? [英] How does one call on this Haskell function?

问题描述

这是一个函数，用于生成一定范围内给定数量的随机数的列表，但是我对如何调用此函数感到困惑.我认为StdGen需要种子，但是如果有人可以告诉您如何精确调用此函数，我将非常感激.

  randomList ::(随机数a)=>(a，a)->整数->StdGen->[一种]randomList bnds n =取n.randomRs出价 

解决方案

示例:

  main :: IO()主=做g<-getStdGen打印(randomList(1，100)5 g :: [Integer]) 

将输出例如

  [42,42,15,7] 

g 是随机数生成器，在这种情况下是全局随机数生成器".这是文档

This is a function to generate a list of given number of random numbers within a range, but I'm confused on how to call on this function. I think a seed is needed for StdGen, but really appreciate if someone can tell how exactly to call this function.

randomList :: (Random a) => (a,a) -> Int -> StdGen -> [a]
randomList bnds n = take n . randomRs bnds

解决方案

Sample:

main :: IO ()
main = do g <- getStdGen
          print (randomList (1, 100) 5 g :: [Integer])

will output e.g.

[42,42,15,7]

The g is the random number generator, in this case the "global random number generator". Here's the documentation

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