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• Python Numpy Structured Array (recarray) assigning values into slices

  - by user368877

  Hi, The following example shows what I want to do: >>> test rec.array([(0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0), (0, 0, 0)], dtype=[('ifAction', '|i1'), ('ifDocu', '|i1'), ('ifComedy', '|i1')]) >>> test[['ifAction', 'ifDocu']][0] (0, 0) >>> test[['ifAction', 'ifDocu']][0] = (1,1) >>> test[['ifAction', 'ifDocu']][0] (0, 0) So, I want to assign the values (1,1) to test[['ifAction', 'ifDocu']][0]. (Eventually, I want to do something like test[['ifAction', 'ifDocu']][0:10] = (1,1), assigning the same values for for 0:10. I have tried many ways but never succeeded. Is there any way to do this? Thank you, Joon

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• The sieve of Eratosthenes in F#

  - by IVlad

  I am interested in an implementation of the sieve of eratosthenes in purely functional F#. I am interested in an implementation of the actual sieve, not the naive functional implementation that isn't really the sieve, so not something like this: let rec PseudoSieve list = match list with | hd::tl -> hd :: (PseudoSieve <| List.filter (fun x -> x % hd <> 0) tl) | [] -> [] The second link above briefly describes an algorithm that would require the use of a multimap, which isn't available in F# as far as I know. The Haskell implementation given uses a map that supports an insertWith method, which I haven't seen available in the F# functional map. Does anyone know a way to translate the given Haskell map code to F#, or perhaps knows of alternative implementation methods or sieving algorithms that are as efficient and better suited for a functional implementation or F#?

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• Linear Recurrence for very large n

  - by Android Decoded

  I was trying to solve this problem on SPOJ (http://www.spoj.pl/problems/REC/) F(n) = a*F(n-1) + b where we have to find F(n) Mod (m) where 0 <= a, b, n <= 10^100 1 <= M <= 100000 I am trying to solve it with BigInteger in JAVA but if I run a loop from 0 to n its getting TLE. How could I solve this problem? Can anyone give some hint? Don't post the solution. I want hint on how to solve it efficiently.

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• How to access a list in OCaml

  - by Erik

  I want to write a function that could check every item in a list is true or false. If at least one element is false, it will return true, so that: assert_eq "checkFalse [true; false; true]" (checkFalse [true; true; true]) false; assert_eq "checkFalse [false; false]" (checkFalse [false; true]) true; I am an absolute beginner in OCaml and I don't know how to approach this. I tried using a for loop, something like: let rec checkFalse (bools: bool list) : bool = for i = 0 to bools.length do if bools.length == false then false else... (I don't know how to continue) Then it said "Unbound record field...." I also tried using find like: if (find false bools != Not_found) then true else false But my ways did not work. I came from a Java background. Thank you very much!

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• Problem with pattern matching in ocaml

  - by Antony

  I wrote the function used to decompose a Boolean function, the problem is that the compilation I get this : "Warning 5: this function application is partial, maybe some arguments are missing." How can I solve this problem? I've set wrong the patter matching or I can not run this operation with pattern matching The code is the following: let rec decomposition state_init state prec formula = match formula with And form -> (fun () -> let f1 = List.hd form in let f2 = And(List.tl form )in let new_state = Forms (state_init,f1) in decomposition state_init new_state state f1; decomposition state_init new_state state f2; Hashtbl.add graph new_state (("",false,state :: []) , []) ; let x = Hashtbl.find graph state in let succ = state :: snd x in let (desc,last,ptrs) = fst x in Hashtbl.replace graph state ( ("And-node",last,ptrs) , succ))

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• Swing code in sockets

  - by asb

  I am learning swings for making GUI. I was thinking which is the best possible way in case of socket with swings. 1. The whole swing code goes in the server file. All the handlers and logic in on server side. Client only create socket. 2. The server have logic part. The code for the swing to display interface goes on client side. Client Creates stream to send / rec. data from server. Whch is the good way out of 2 ?

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• mail function in windows application

  - by Ranjana

  i have used a mail function. after inserting every record simultaneously from multiple PC. I have set a timer which ticks for every 2 min. while it ticks it start to check the record and it send the mail. i have used background worker for that.in Bgdworker the mail fn will be called. private void timer_Startsendingemail_Tick(object sender, EventArgs e) { if (!bgw_startsendingemail.IsBusy) bgw_startsendingemail.RunWorkerAsync(); } private void bgw_startsendingemail_DoWork(object sender, DoWorkEventArgs e) { sendingMail(); sendingsms(); } in sendingmail() fn the datas fetch from database and send the mail based on email settings to all the inserted rec. but the prob is the timer triggered for 2 min often , and the process will be working fine and nothing there in log file but sometime the mail is not received by the clients.how to fix the prob. how to find out where it is strucked... its hard to find the problem. any idea over this??????????/

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• How to open form action in Jquery Dialog

  - by user342391

  I have a form: <form style="display: inline;" action="/player.php" method="post"> <input type="hidden" name="recname" value="'.$row['name'].'"> <input type="hidden" name="recordingdesc" value="'.$row['description'].'"> <input type="hidden" name="reclink" value="$_SESSION['customerid'].'-'.$row['timestamp'].'.wav"> <button type="submit" class="tooltip table-button ui-state-default ui-corner-all" title=" rec"><span class="ui-icon ui-icon-volume-on"></span></button> </form> and i want player.php to open in a modal dialog and be able to display the post information how can this be done.

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• Using an IN clause in Vb.net to save something to the database using SQL

  - by Rob

  I have a textbox and a button on a form. I wish to run a query (in Vb.Net) that will produce a query with the IN Values. Below is an example of my code myConnection = New SqlConnection("Data Source=sqldb\;Initial Catalog=Rec;Integrated Security=True") myConnection.Open() myCommand = New SqlCommand("UPDATE dbo.Recordings SET Status = 0 where RecID in ('" & txtRecID.Text & "') ", myConnection) ra = myCommand.ExecuteNonQuery() myConnection.Close() MsgBox("Done!", _ MsgBoxStyle.Information, "Done") When I enter a single value it works but when I enter values with commas it throws an error: "Conversion failed when converting the varchar value '1234,4567' to data type int." Could someone please help me to solve this or if there is an alternative way? Many Thanks

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• Does the XML specification states that parser need to convert \n\r to \n always, even when \n\r appe

  - by mic.sca

  Hi, I've stumbled in a problem handling the \line-feed and \carriage-return characters in xml. I know that, according to http://www.w3.org/TR/REC-xml/#sec-line-ends, xml processors are required to replace any "\n\r" or lone "\r" sequences with "\n". The specification states that this has to be the behaviour for handling any "external parsed entity", does this apply to CDATA sections inside of an element as well? thank you, Michele I'm sure that msxml library for example converts every \n\r" or lone "\r" sequences to "\n", regardless of their being in a cdata section or not.

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• Getting every nth Element of a Sequence

  - by Alexander Rautenberg

  I am looking for a way to create a sequence consisting of every nth element of another sequence, but don't seem to find a way to do that in an elegant way. I can of course hack something, but I wonder if there is a library function that I'm not seeing. The sequence functions whose names end in -i seem to be quite good for the purpose of figuring out when an element is the nth one or (multiple of n)th one, but I can only see iteri and mapi, none of which really lends itself to the task. Example: let someseq = [1;2;3;4;5;6] let partial = Seq.magicfunction 3 someseq Then partial should be [3;6]. Is there anything like it out there? Edit: If I am not quite as ambitious and allow for the n to be constant/known, then I've just found that the following should work: let rec thirds lst = match lst with | (_,_,x)::t -> x::thirds t | _ -> [] Would there be a way to write this shorter?

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• Weird exception with OLEDB Parameter Insert

  - by Seamus MacKenzie

  Getting a strange error when trying to insert data into an Access database using parameters. the line where I am getting a problem is :- thisCommand.CommandText = "INSERT INTO Events (Venue_ID, Date_Start, Date_End, Time_Start, Time_End, Name, Description, Event_Type, Buy_Tickets_URL) VALUES (@VenID, @DStart, @DEnd, @evTime, @evTime, @Name, @Des, @EvType, @SysUrl);"; string desc = GetDesc(rec.EvName); thisCommand.Parameters.AddWithValue("@Des", desc); thisCommand.ExecuteNonQuery(); None of the other parameters cause a problem but when trying to insert data to the description field I get a database exception saying the field is too small to accept the amount of data. The problem is my program is only trying to insert 3 characters when it throws the error and the Description field is a memo so should be able to hold up to 65000+ characters. When inserting a value manually in the CommandText everything works fine so it must be something to do with the parameter properties.

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• Fibonacci Numbers in Haskell

  - by boraer

  Hi everbody I need to change my F# code to Haskell code but I am so new in Haskell and I can not this My code simply read data from keyboard if data not an integer return an error message then calculate the n fibonacci number then writes to a list after that writes the list into a txt file Here is my code open System let rec fib n = match n with |0->0 |1->1 |2->1 |n->fib(n-1)+fib(n-2);; let printFibonacci list = for i=0 to (List.length list)-1 do printf "%d " (list.Item(i));; let writeToFile list = let file = System.IO.File.Create("C:\out2.txt") let mutable s ="" let writer = new System.IO.StreamWriter(file) try for i=0 to (List.length list)-1 do s <- list.Item(i).ToString() writer.Write(s+" ") finally writer.Close() file.Dispose() printfn "Writed To File" let mutable control = true let mutable num = 0 while control do try printfn "Enter a Number:" num <- Convert.ToInt32(stdin.ReadLine()) let listFibonacci = [for i in 0 .. num-1->fib(i)] printFibonacci(listFibonacci) printfn "\n%A"(listFibonacci) writeToFile(listFibonacci) control<-false with | :? System.FormatException->printfn "Number Format Exception"; Console.ReadKey true|>ignore

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• F# operator over-loading question

  - by jyoung

  The following code fails in 'Evaluate' with: "This expression was expected to have type Complex but here has type double list" Am I breaking some rule on operator over-loading on '(+)'? Things are OK if I change '(+)' to 'Add'. open Microsoft.FSharp.Math /// real power series [kn; ...; k0] => kn*S^n + ... + k0*S^0 type Powers = double List let (+) (ls:Powers) (rs:Powers) = let rec AddReversed (ls:Powers) (rs:Powers) = match ( ls, rs ) with | ( l::ltail, r::rtail ) -> ( l + r ) :: AddReversed ltail rtail | ([], _) -> rs | (_, []) -> ls ( AddReversed ( ls |> List.rev ) ( rs |> List.rev) ) |> List.rev let Evaluate (ks:Powers) ( value:Complex ) = ks |> List.fold (fun (acc:Complex) (k:double)-> acc * value + Complex.Create(k, 0.0) ) Complex.Zero

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• how to get a sub list from a list in ocaml

  - by romerun

  Hi, I'm looking at the List document. It seems the library does not provide a sublist function. I'm trying to get list of elements from i to j. Now I have to write it as: let rec sublist list i j = if i j then [] else (List.nth list i) :: (sublist list (i+1) j) which is quite concise but I'm questioning the efficiency of List.nth, because if it's O(n), I would rather have to write it in a less concise way. I'm wondering why didn't they provide List.sublist func, if List.nth is not O(1), because it's such a quite common operation..

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• Function which returns itself

  - by Juliet

  As a purely academic exercise (read "because I have no life"), I'm trying to write a function f which accepts another function g, executes g for its side effect, and returns itself. So I have this: let rec f g x = ignore(g x) fun y -> f g y F# complains: fun y -> f g y;; -------------^^^^^ C:\Users\Juliet\AppData\Local\Temp\stdin(8,14): error FS0001: Type mismatch. Expecting a 'a but given a 'b -> 'a The resulting type would be infinite when unifying ''a' and ''b -> 'a' If it works the way I intend, then I could write: let printer = f (printfn "%s") printer("this")("is")("so")("useless")("its")("awesome!") // prints: // this // is // so // useless // its // awesome Is it possible to write a function like this?

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• Help me to explain the F# Matrix transpose function

  - by Kev

  There is a Matrix transpose function: let rec transpose = function | (_::_)::_ as M -> List.map List.head M :: transpose (List.map List.tail M) | _ -> [] [[1; 2; 3]; [4; 5; 6]; [7; 8; 9]] |> transpose |> printfn "%A" It works fine. What does ( _ :: _ ) :: _ mean? I don't understand the whole code! Who can explain it? Thank You!

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• Whhether or not it is an elegant way in such a situation?

  - by z_axis

  There are some text files which needed to be manipulated line by line. I wrote a withFile function as below: let withFile fn handle = let rec iter_lines fh = try handle (input_line fh); iter_lines fh with _ -> close_in fh in iter_lines (open_in fn);; So i can manipulate each file as : withFile "file1.txt" (fun line -> (*...*)) withFile "file2.txt" (fun line -> (*...*)) ... But i amnot sure how to exit elehantly when i donot want to handle all lines. For example: withFile "file3.txt" (fun line -> (*when the line meets some condition, i will exit without handling other lines*) ); Any suggestion is appreciated !

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• What's some simple F# code that generates the .tail IL instruction?

  - by kld2010

  I'd like to see the .tail IL instruction, but the simple recursive functions using tail calls that I've been writing are apparently optimized into loops. I'm actually guessing on this, as I'm not entirely sure what a loop looks like in Reflector. I definitely don't see any .tail opcodes though. I have "Generate tail calls" checked in my project's properties. I've also tried both Debug and Release builds in Reflector. The code I used is from Programming F# by Chris Smith, page 190: let factorial x = // Keep track of both x and an accumulator value (acc) let rec tailRecursiveFactorial x acc = if x <= 1 then acc else tailRecursiveFactorial (x - 1) (acc * x) tailRecursiveFactorial x 1 Can anyone suggest some simple F# code which will indeed generate .tail?

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• F# match char values

  - by rwallace

  I'm trying to match an integer expression against character literals, and the compiler complains about type mismatch. let rec read file includepath = let ch = ref 0 let token = ref 0 use stream = File.OpenText file let readch() = ch := stream.Read() let lex() = match !ch with | '!' -> readch() | _ -> token := !ch ch has to be an int because that's what stream.Read returns in order to use -1 as end of file marker. If I replace '!' with int '!' it still doesn't work. What's the best way to do this?

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• Looking for Haskell `group` alternative in F#

  - by Heather

  Haskell group descripted there: http://www.haskell.org/ghc/docs/latest/html/libraries/base/Data-List.html#v:group example : group "Mississippi" = ["M","i","ss","i","ss","i","pp","i"] Is there simple F# way of doing it? I can implement something alike let rec sameCounter (data : list<float>) el same (ss : list<float * int>) = if data.Length > (el + 1) then if data.[el] = data.[el + 1] then sameCounter data (el + 1) <| same + 1 <| ss else if same > 0 then sameCounter data (el + 1) <| 0 <| (data.[el], same) :: ss else sameCounter data (el + 1) <| 0 <| ss else ss let group d = sameCounter d 0 0 [] but it's a bit ugly way I think, is there better variant?

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• Writing lambda functions in Scala

  - by user2433237

  I'm aware that you can write anonymous functions in Scala but I'm having trouble trying to convert a piece of code from Scheme. Could anyone help me convert this to Scala? (define apply-env (lambda (env search-sym) (cases environment env (empty-env () (eopl:error 'apply-env "No binding for ~s" search-sym)) (extend-env (var val saved-env) (if (eqv? search-sym var) val (apply-env saved-env search-sym))) (extend-env-rec (p-name b-var p-body saved-env) (if (eqv? search-sym p-name) (proc-val (procedure b-var p-body env)) (apply-env saved-env search-sym)))))) Thanks in advance

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• CORS Fails on CloudFront Distribution with Nginx Origin

  - by kgrote

  I have a CloudFront distribution set up with an Nginx server as the origin (a Media Temple DV server, to be specific). I enabled the Access-Control-Allow-Origin: * header so fonts will work in Firefox. However, Firefox throws a CORS error for fonts loaded from this CloudFront/Nginx distribution. I created another CloudFront distribution, this time with an Apache server as the origin, and set Access-Control-Allow-Origin: * also. Firefox displays fonts from this origin without issue. I've set up a demo page here: http://kristengrote.com/cors-test/ When I perform a curl request for the same font file from each distribution, both files return almost exactly the same headers: Apache Origin Nginx Origin ——————————————————— ——————————————————— HTTP/1.1 200 OK HTTP/1.1 200 OK Server: Apache Server: nginx Content-Type: application/font-woff Content-Type: application/font-woff Content-Length: 25428 Content-Length: 25428 Connection: keep-alive Connection: keep-alive Date: Wed, 11 Jun 2014 23:23:09 GMT Date: Wed, 11 Jun 2014 23:15:23 GMT Last-Modified: Tue, 10 Jun 2014 22:15:56 GMT Last-Modified: Tue, 10 Jun 2014 22:56:09 GMT Accept-Ranges: bytes Accept-Ranges: bytes Cache-Control: max-age=2592000 Cache-Control: max-age=2592000 Expires: Fri, 11 Jul 2014 23:23:09 GMT Expires: Fri, 11 Jul 2014 23:15:23 GMT Access-Control-Allow-Origin: * Access-Control-Allow-Origin: * Access-Control-Allow-Methods: GET, HEAD Access-Control-Allow-Methods: GET, HEAD Access-Control-Allow-Headers: * Access-Control-Allow-Headers: * Access-Control-Max-Age: 3000 Access-Control-Max-Age: 3000 X-Cache: Hit from cloudfront X-Cache: Hit from cloudfront Via: 1.1 210111ffb8239a13be669aa7c59f53bd.cloudfront.net (CloudFront) Via: 1.1 fa0dd57deefe7337151830e7e9660414.cloudfront.net (CloudFront) X-Amz-Cf-Id: QWucpBoZnS3B8E1mlXR2V5V-SVUoITCeVb64fETuAgNuGuTLnbzAhw== X-Amz-Cf-Id: E2Z3VOIfR5QPcYN1osOgvk0HyBwc3PxrFBBHYdA65ZntXDe-srzgUQ== Age: 487 X-Accel-Version: 0.01 X-Powered-By: PleskLin X-Robots-Tag: noindex, nofollow So the only conclusion I can draw is that something about Nginx is preventing Firefox from recognizing CORS and allowing the fonts via CloudFront. Any ideas on what the heck is happening here?

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• Easiest way to allow direct HTTPS connection in Intercept mode?

  - by Nick Lin

  I know the SSL issue has been beaten to death I'm using DNS redirect to force my clients to use my intercept proxy. As we all know, intercepting HTTPS connection is not possible unless I provide a fake certificate. What I want to achieve here is to allow all HTTPS requests connect directly to the source server, thus bypassing Squid: HTTP connection Proxy by Squid HTTPS connection Bypass Squid and connect directly I spent the past few days goolging and trying different methods but none worked so far. I read about SSL tunneling using the CONNECT method but couldn't find any more information on it. I tried a similar method in using RINETD to forward all traffic going through port 443 of my Squid back to the original IP of www.pandora.com. Unfortunately, I did not realize all other HTTPS requests are also forwarded to the IP of www.pandora.com. For example, https://www.gmail.com also takes me to https://www.pandora.com Since I'm running the Intercept mode, the forwarding needs to be dynamic and match each HTTPS domain name with proper original IP. Can this be done in Squid or iptables? Lastly, I'm directing traffic to my Squid server using DNS zone redirect. For example, a client requests www.google.com, my DNS server directs that request to my Squid IP, then my transparent Squid will proxy that request. Will this set up affect what I'm trying to achieve? I tried many methods but couldn't get it to work. Any takes on how to do this?

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• Put one monitor of a dual monitor windows system into standby

  - by Psycogeek

  Standby not Disabled! When running 2 monitors on windows 7 or Windows XP, I would like to be able to put one of the monitors at a time into standby. The method can be manual. When running 2 monitors , the second monitor is not always needed, shutting off the monitors own power switch will turn off the monitor, that does work Ok. Problems with that are , the delay with the monitor logo at turn on, and the power switch is not very accessable, and the switch might not live forever turning it on and off so many times. Using disable methods like devcon, WIN-P and Display, causes all the windows to properly move to the other monitor. While that is what a person would want to happen so they can get hold of the windows, that is not what I want to happen, and some things on the other monitor have to be re-arranged after a re-enable. By putting it into standby mode, nothing changes other than the monitor going into standby. Disconnecting the DVI cable still can cause the system to (properly) shift all the windows over to the one monitor, just like any of the disable methods do. That makes a mess of the windows, and is so unacceptable, that I would prefer to leave the monitor on, wasting power and the hardware, when it could easily go into standby for some time. For both monitors I am using a "MonitorOff" program that puts both monitors into standby, but I can not find a utility that will put only ONE monitor into standby for the windows system. If someone comes along and suggests "ultramon" you must know for a fact that it will put One of either of the monitors into actual standby. And it does not really suit me to use ultramon, I tested it (it was nice) and I did not feel that it was a program I wanted. The 2 monitors are running off of an ATI 4890 card, they are both hooked up DVI-I, the OS is both Windows 7 (primary) and Windows XP. In addition it would also be interesting to have seperate standby activity timers, and follow mouse kind of standby changes, but any manuel method , shortcut, batch , tray, or gadget kind of operation would be a good start.

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