Here's one solution:
1 2 3 4 5 6 7
let tuplesOk arr = let candidates = Array.filter (fun (x,_) -> x > 1) arr (* take the last 3 elements for comparison *) let arr' = candidates.[candidates.Length-4 ..] (* is this new array sorted? *) arr' = Array.sortBy (fun (_,x) -> x) arr'
Hello, KVB:
Thank you very much for your quick yet great reply.
I tried to trace the code.
I can see the array 'candidate' is an array with 3 tuples; but I can not see the array arr'. So, I changed your code, so it looks like:
let
tuplesOk arr =
let
candidates = Array.filter (fun
(x,_) -> x > 1) arr
(*
take the last 3 elements for comparison *)
let
arr' = candidates.[candidates.Length-3 ..]
(*
is this new array sorted? *)
arr' = Array.sortBy (fun
(_,x) -> x) arr'It works with my sample data.
Can you explain a little bit about your code?
But I can not see what is arr'.
And I don't quite understand Array.sortBy (fun
(_,x) -> x) arr'
Is it sort the array by the second element of each tuple?
Thanks!
Wish you have a Merry Christmas and a Happy New Year!
Hi,
Sorry about the 3->4 typo; your fix is correct. To answer your other questions, arr' is a new array containing the last 3 elements of the candidate array. The Array.sortBy expression is then returning a new sorted version of this array sorted by the second element, as you guessed. In fact, you can replace
1
(fun (_,x) -> x)
by the built-in function snd.
Hello, KVB:
Thank you very much for you good explanation, and for you great solution. Now I understand much better.
But I forgot to ask yet another question: How I can check if the second elements of the last 3 tuples are in descending order.
I mean, for example:
let aTuples = [|(2, 2.5); (1, 2.4); (3, 2.3); (4, 2.1)|]
I guess the Array.SortBy is only for ascending order, may be I have to use Array.sortWith to check if the second element of the qualified tuples is in descending order, right?
Can you show me the code how I can do this?
Thanks, Have a nice holiday and Happy New Year to you!
I don't think sort is the right function for your spec. you need some form of fold(in the standard FP style). It can also be achieved via the zip() variants.
below is my first attempt:
let aTuples = [|(2, 2.1); (1, 2.2); (3, 2.3); (4, 2.5)|]
let l3 l = List.foldBack (fun (x,y) (flag, last, cnt) -> if x < 2 then (flag, last, cnt) else (flag && last >= y, (if cnt >=3 then float.MaxValue else y), cnt+1)) l (true, float.MaxValue, 0)
Hello, Gary:
Thank you for your reply. But I think I have found another way.
let
aTuples = [|(2, 2.5); (1, 2.4); (3, 2.3); (4, 2.1)|]
let
tuplesOk arr =
let
candidates = Array.filter (fun
(x,_) -> x > 1) arr
(*
take the last 3 elements for comparison *)
let
arr' = candidates.[candidates.Length-3 ..]
(*
is this new array reversely sorted? *)
arr' = Array.rev(Array.sortBy (snd) arr')
if tuplesOk aTuples then printfn "in descending order!"
I think the logic is easier, as Array.foldBack is not easy to figure out.
My logic here is: if it is in descending order, then if I reverse the order of the array, then it must be in ascending order.
At least it works with my sample data and some other samples.
But thanks any way!
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Dear All:
First of all, Merry Christmas and
Happy New Year to all!
Second, I have a little issue, I
need some help.
I have an Array of tuples.
For example: let aTuples = [|(2,
2.1); (1, 2.2); (3, 2.3); (4, 2.5)|]
My task is to check if the first
element of the underlying tuple in the array is more than 1, if so, then
consider the tuple, if not, discard the tuple;
For all the tuples under my
consideration, I want to check to see if the last 3 array items are in the
ascending order in the second element of the tuple.
In the above example: the tuples
in the consideration are: (2, 2.1) ; (3, 2.3) and (4, 2.5) but (1, 2.2) is out
of the consideration, as the first element of the tuple is only 1; for the array
of tuples under the consideration, the last 3 items are in ascending order for
the second element of the tuple. Since here:
the second elements are: 2.1/2.3/2.5.
I have some code, but don’t have
idea how to reach my goal:
#light
open System
let aTuples = [|(2,
2.1); (1, 2.2); (3, 2.3); (4, 2.5)|]
let isMoreThen1 ( x, _ ) =
if x > 1
then true
else false
let considers = aTuples |> Array.partition isMoreThen1
I can see in F#, I got 2 Arrays
with the first one contain the array under consideration, the second one out of
consideration; but I have no idea on how to write a function on the first array
to find if the last 3 tuples are in ascending order for the second element.
Any idea is welcome! Better with code samples, my environment:
VS2010 Beta2 with F# 1.9.7.4
Thanks!<br style="">
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