Jun 7, 2023 · A sequence is a logical series of elements all of one type. Sequences are particularly useful when you have a large, ordered collection of data but do not necessarily expect to use all of the elements.

Oct 4, 2014 · The cross function would look like this (Of course, you can modifiy this to take a parameter to apply to the two numbers instead of creating a tuple): let cross xs ys = xs |> List.collect (fun v1 -> ys |> List.map (fun v2 -> (v1, v2)))

Apply a function to every element of a sequence using Seq.map. Got any F# Question? ChatGPT answer me! Get monthly updates about new articles, cheatsheets, and tricks.

Jan 24, 2010 · Seq.collect will first map each sequence element to a new sequence and flatten this sequences into a single one. Seq.map will just map each element to a new element.

Jan 5, 2011 · I use the workhorse of sequences, Seq.map, that applies a function to every element of the sequence. Remember that the element is still a tuple (key, subsequence).

Apr 4, 2011 · Use a mutable dictionary (or another relevant collection type) instead of a Map. Try using the dict function instead of Map.ofSeq, for instance. The problem here is that by adding StructuralComparison attribute to the type Category you've asked F# to use structural comparison when comparing instances of Category.

SeqMap is a tool for mapping large amount of oligonucleotide to the genome. It is designed for finding all the places in a genome where an oligonucleotide could potentially come from. SeqMap can efficiently map as many as dozens of millions of short sequences to a genome of several billions of nucleotides.

// initial sequence let simpleSeq = seq { for x in 1 .. 5 -> x } // mapping function to initial sequence. Notice that the function applied by map can return any data type to the new sequence. let xTimes2 = simpleSeq |> Seq.map (fun x -> sprintf "x * 2 = %i" (x * 2) ) printfn "simpleSeq: %A" simpleSeq printfn "xTimes2: %A" xTimes2

Feb 15, 2012 · 本文介绍了F#中Seq模块的功能及用法，Seq模块提供了一系列处理IEnumerable类型数据的强大函数，如map、iter、fold等，并对比了Seq与List的不同之处。 如果你熟悉F#中的list，你可能知道List模块中包含了很多方便快捷的用来处理多种集合类型数据的 函数，其实Sequence与List相似，也是拥有着大量此类函数，这些函数可以用来处理任何实现了IEnumerable接口的集合类型。 Sequence与List 最大的区别在于Sequence 在任意时刻，内存 …

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