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Asked: 2026-05-10T23:14:52+00:00

I was trying to code along with the PDC2008 Intro to F# video .

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I was trying to code along with the PDC2008 Intro to F# video. I get an error in the last line of the code snippet shown below (that the presenter did not get) ‘Error 1 This value is not a function and cannot be applied’. I am running Fsharp-1.9.6.2 on Visual Studio 2008 shell. The startPrice symbol in the last line is underlined red with same error on mouse over. Thanks in advance!

type StockAnalyzer (lprices, days) =      let prices =         lprices         |> Seq.map snd         |> Seq.take days     static member GetAnalyzers (tickers,days) =          tickers         |> Seq.map loadPrices         |> Seq.map (fun prices -> new  StockAnalyzer (prices, days))     member s.Return =          let  lastPrice = prices |> Seq.nth 0         let  startPrice = prices |> Seq.nth (days - 1)         lastPrice / startPrice  -1.
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1 Answer

  1. Try putting a space between the ‘-‘ and ‘1’. The F# compiler is interpretting -1 as literraly a negative value of 1 instead of subtract 1.

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