F#制图中记录的绘制顺序

Question

我刚开始学习F#，在理解如何使用F#图表中的记录序列时遇到了一些困难。

我有一个函数（ReturnTemp），它返回一系列TempData类型的记录。TempData由如下所示的记录类型定义

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

我不清楚如何将此序列与Chart.Line一起使用，以便在x轴上绘制日期，在Y轴上绘制温度。

Answer 1

下面是一个使用TempData记录列表显示折线图的示例：

#r """..packagesFSharp.Charting.0.90.7libnet40FSharp.Charting.dll"""
#load """..packagesFSharp.Charting.0.90.7FSharp.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

您也可以使用FsPlot使用Highcharts或Google图表生成类似的图表。