visual-studio-2010 - 在行 .`` Petal Width`|]) 行上获取缺少资格错误

Question

预先感谢您的任何回复，这个论坛上的答案对我的研究非常宝贵。我是一名为了语言范式研究项目而学习 F# 的学生，我正在尝试利用 http://trelford.com/blog/post/specialk.aspx 中的一个极好的例子。为了玩一个简单的k-means算法。我收到一个错误，我不确定如何修复，希望得到一些指导。非常有责任，这是代码，错误是:Getting Missing Qualification Error on row.`Petal Width|]) Line

//代码来自http://trelford.com/blog/post/specialk.aspx

open System
open FSharp

type Iris = CsvProvider<irisDataFile>
let iris = Iris.Load(irisDataFile)
let irisData = iris.Data |> Seq.toArray
//
///// classifcations
let y = irisData |> Array.map (fun row -> row.Class)
/// feature vectors
let X = irisData |> Array.map (fun row -> 
  [|row.``Sepal Length`` 
    row.``Sepal Width`` 
    row.``Petal Length`` 
    row.``Petal Width`|])


//Computing k-means centroids:

let K = 3 // The Iris dataset is known to only have 3 clusters

let seed = 
  [|X.[0]; X.[1]; X.[2]|]  // pick bad centroids on purpose

let centroidResults = 
  KMeans.computeCentroids seed X |> Seq.take iterationLimit



(* K-Means Algorithm *)

/// Group all the vectors by the nearest center. 
let classify centroids vectors = 
  vectors |> Array.groupBy (fun v -> centroids |> Array.minBy (distance v))

/// Repeatedly classify the vectors, starting with the seed centroids
let computeCentroids seed vectors = 
  seed |> Seq.iterate (fun centers -> classify centers vectors |> Array.map (snd >> average))

Answer 1

看起来你在这里漏掉了一个反引号:

row.``Petal Width`|])

应该是:

row.``Petal Width``|])