deedle

问题 By position I mean: let position:int = positionForKey frame key let row = Frame.take positionForKey |> frame.takeLast 1 Then, row should be a Frame with only one row, whose key is key . What I don't know is how to achieve positionForKey . One idea that should work but I don't know if it's the best way of doing it would be to create another Series via Series.scanValues and let the values be the positions, but I think there oughts to be a more elegant way of doing it. The implementation via

问题 By position I mean: let position:int = positionForKey frame key let row = Frame.take positionForKey |> frame.takeLast 1 Then, row should be a Frame with only one row, whose key is key . What I don't know is how to achieve positionForKey . One idea that should work but I don't know if it's the best way of doing it would be to create another Series via Series.scanValues and let the values be the positions, but I think there oughts to be a more elegant way of doing it. The implementation via

问题 Given the following CSV file A,B 2,3 5,7 9,11 I'd like to add the two columns, resulting in A,B,C 2,3,5 5,7,12 9,11,20 using C# and Deedle. using Deedle; using System.IO; using System.Linq; namespace NS { class AddTwoColumns { static void main(string[] args) { var root = "path/to"; var df = Frame.ReadCsv(Path.Combine(root, "data.csv")); var a = df.GetColumn<int>("A"); var b = df.GetColumn<int>("B"); var c = df.Select(x => x.a + x.b); df.AddColumn("C", c); df.Print(); } } } Neither the

问题 here is a small example where I want to deal with missing values on custom functions on series. suppose that i have obtained a series series4;; val it : Series<int,int opt> = 1 -> 1 2 -> 2 3 -> 3 4 -> <missing> for example, this way: let series1 = Series.ofObservations [(1,1);(2,2);(3,3)] let series2 = Series.ofObservations [(1,2);(2,2);(3,1);(4,4)] let series3 = series1.Zip(series2,JoinKind.Outer);; let series4 = series3 |> Series.mapValues fst Then if i do, Series.mapAll (fun v -> match v

问题 I was using Deedle in F# to read a txt file (no header) to data frame, and cannot find any example about how to specify the schema. let df= Frame.ReadCsv(datafile, separators="\t", hasHeaders=false, schema=schema) I tried to give a string with names separated by ',', but seems don't work. let schema = @"name, age, address"; I did some search on the doc, but only find following - don't know where I can find the info. :( schema - A string that specifies CSV schema. See the documentation for

问题 I want to have an overview of a Series in my dataframe, something like pandas' unique values counting. I don't know if there's a built-in function for that. So far i've done a function to just get the numbers of different features. I could manage to do the job, my question is only about a built-in function. let unique (s:Deedle.Series<'a,'a>) = s.Values |>Seq.distinct |>Seq.length I want a result like : [("value1",5);("value2",8)] 回答1: You can use the groupInto function - this lets you group

问题 I downloaded the new VS 2017 yesterday and it is working fine, except that I am getting this warning on every line where I call the static method Frame.ReadCsv from the Deedle package: FS10001 This method is not intended for use from F# Calls to other static methods Frame.X do not generate the same warning. Example - this line of code generates the warning: let msft = Frame.ReadCsv(Config.tsDir + "MSFT.csv", hasHeaders=true, inferTypes=true) Intellisense recognizes the method and provides the

问题 I have a deedle data frame, called df, with one of the columns named TimeSpent . I would like to keep the rows, which have values for TimeSpent greater than a specific TimeSpan (e.g. 30 minutes). I could only manage to keep the rows with a specific TimeSpan (30 min) by using FilterRowsBy() df = df.FilterRowsBy<int, string, TimeSpan>("TimeSpent", new TimeSpan(0, 30, 0)); How do you filter a deedle data frame for a certain range? UPDATE: So, I decided to try to sort the deedle frame by TimeSpan

问题 I have the following piece of code: let mychart = frame.GetAllSeries() |> Seq.iter(fun key value -> Chart.Line(value, Name=key) |> Chart.Combine where frame.GetAllSeries() returns a seq<KeyValuePair> . I'd like to pipe the sequence directly in a chart. I thought I could iterate through the sequence. The problem is that I can't find an idomatic way to access the key and value separately that could be plugged in directly in the lambda expression. Thanks. EDIT This works: let chart = frame

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . We are dealing with a multithreaded C# service using Deedle. Tests on a quad-core current system versus an octa-core target system show that the service is about two times slower on the target system instead of two times faster. Even when restricting the number of threads to two,