Question

我刚刚开始使用F＃并且在理解如何使用F＃Charting的记录序列时遇到一些麻烦。

我有一个函数（ReturnTemp），它返回一个TempData类型的记录序列。 TempData由记录类型定义如下

type TempData = {Date: System.DateTime; Year: int64 ; Location: string; Temperature: decimal}

我不清楚如何使用Chart.Line的这个序列来绘制x轴上的Date和Y轴上的Temperature。

Answer 1

以下是使用TempData记录列表显示折线图的示例：

#r """..\packages\FSharp.Charting.0.90.7\lib\net40\FSharp.Charting.dll"""
#load """..\packages\FSharp.Charting.0.90.7\FSharp.Charting.fsx"""

open FSharp.Charting
open System

type TempData = {
    Date: System.DateTime
    Year: int64
    Location: string
    Temperature: decimal
}

let data =
    [
        {Date = DateTime.Today.AddDays -4.; Year = 2014L; Location = "City X"; Temperature = 13M}
        {Date = DateTime.Today.AddDays -3.; Year = 2014L; Location = "City X"; Temperature = 16M}
        {Date = DateTime.Today.AddDays -2.; Year = 2014L; Location = "City X"; Temperature = 12M}
        {Date = DateTime.Today.AddDays -1.; Year = 2014L; Location = "City X"; Temperature = 14M}
        {Date = DateTime.Today; Year = 2014L; Location = "City X"; Temperature = 18M}
    ]

data
|> List.map (fun x -> x.Date, x.Temperature)
|> Chart.Line

您还可以使用FsPlot使用Highcharts或Google Charts生成类似的图表。

绘制F＃图表中的记录顺序

1 个答案: