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  • Replace Loops in R function

    - by David Hicks
    Hi, I'm new to R, and I'm having trouble figuring out how to replace the FOR loop in the function below. The function estimates a population mean. Any help at all would be much appreciated. Thank you! myFunc<- function(){ myFRAME <- read.csv(file="2008short.csv",head=TRUE,sep=",") meanTotal <- 0 for(i in 1:100) { mySample <- sample(myFRAME$TaxiIn, 100, replace = TRUE) tempMean <- mean(mySample) meanTotal <- meanTotal + tempMean } cat("Estimated Mean: ", meanTotal/100, "\n") #print result }

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  • Jquery Dialog - div disappears after initialization

    - by Zuber
    JQuery Dialog is giving me lots of pain lately. I have the following div which I want to be popped up. (Ignore that the classes do not show the double quotes in the syntax) TABLE class=widget-title-table border=0 cellSpacing=0 cellPadding=0> <TBODY> <TR> <TD class=widget-title><SPAN class=widget-title>Basic Info</SPAN></TD> <TD class=widget-action> <DIV id=edit-actions jQuery1266325647362="3"> <UL class="linkbutton-menu read-mode"> <LI class="control-actions"> <A id="action-button" class="mouse-over-pointer linkbutton">Delete this stakeholder</A> <DIV id="confirmation" class="confirmation-dialog title=Confirmation"> Are you sure you want to delete this stakeholder? </DIV> </LI></UL></DIV></TD></TR></TBODY></TABLE> The JQuery for this is ... $(document).ready(function() { $('#confirmation').dialog({ bgiframe: true, modal: true, autoOpen: false, closeOnEscape: false, draggable: true, position: 'center', resizable: false, width: 400, height: 150 }); }); And the dialog is 'open'ed by var confirmationBox = $('#confirmation',actionContent); if (confirmationBox.length > 0) { //Confirmation Needed $(confirmationBox).dialog('option', 'buttons', { 'No': function() { $(this).dialog('close'); }, 'Yes': function() { $('ul.read-mode').hide(); $.post(requestUrl, {}, ActionCallback(context[0], renderFormUrl), 'json'); $(this).dialog('close'); } }); $(confirmationBox).dialog('open'); } The problem starts in the initialization itself. When the document loads, the <div #confirmation> is deleted from the markup! I had a similar issue earlier, but I cannot use that solution here. On this page I can have multiple PopUp divs. When I added the initialization in just before opening it; the form popped up. But after I close it, the div is removed; so I am not able to see the popup again.

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  • Why is the volatile qualifier used through out std::atomic?

    - by Caspin
    From what I've read from Herb Sutter and others you would think that volatile and concurrent programming were completely orthogonal concepts, at least as far as C/C++ are concerned. However, in GCC c++0x extension all of std::atomic's member functions have the volatile qualifier. The same is true in Anthony Williams's implementation of std::atomic. So what's deal, do my atomic<> variables need be volatile or not?

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  • getAudioInputStream can not convert [stereo, 4 bytes/frame] stream to [mono, 2 bytes/frame]

    - by brian_d
    Hello. I am using javasound and have an AudioInputStream of format PCM_SIGNED 8000.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian Using AudioSystem.getAudioInputStream(target_format, original_stream) produces an 'IllegalArgumentException: Unsupported Conversion' when the target_format is PCM_SIGNED 8000.0 Hz, 16 bit, mono, 2 bytes/frame, little-endian Is it possible to convert this stream manually after every read() call? And if yes, how? In general, how can you compare two formats and tell if a conversion is possible?

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  • Databinding in ASP.NET

    - by Victor Hurdugaci
    Is it possible to do data binding on the fields of an object just like in WPF? Something like this: <TextBlock Text="{Binding ElementName=lbColor}" /> just for an asp:TextBox element. What I want is that on submit to have the new values inside the binded object and I don't want to manually read and set the values.

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  • Create an RSS feed from Existing RSS

    - by danit
    Im using the Twitter API to read the Favorites RSS, it generates the following output: http://vl3.co.uk/favs/getfavs.php I'm not sure why this file seems to be incorrect, doesnt come up in my RSS reader or render correctly in the browser. Can anyone shed any light on this? If the output is not valid RSS how can I make it so? Secondly I'd like to cache the RSS feed to then use something like Magpie RSS Parser.

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  • using Multi Probe LSH with LSHKIT

    - by Yijinsei
    Hi Guys, I have read through the source code for mplsh, but I still unsure on how to use the indexes generated by lshkit to speed up the process in comparing feature vector in Euclidean Distance. Do you guys have any experience regarding this?

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  • Opening XNA Xbox 360 assemblies in Reflector

    - by David Brown
    I'd like to get a look at the differences between the Xbox 360 and Windows XNA assemblies. I know the 360 runs the .NET Compact Framework and I was under the impression that Reflector could read CF assemblies, but when I open them, all of the methods are blank and no internal classes are shown. Is this done on purpose, or is it a limitation of Reflector? Is there another way to see how the Xbox 360 XNA assemblies work?

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  • NFS Client library

    - by Reflog
    Hello. I'm looking for some stand alone library to access NFS shares. I am not looking for mounting the shares, just browsing and accessing the files for reading. Preferable something with a simple simple API similar to regular POSIX operations of opendir, scandir, read and etc. Thanks in advance!

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  • whats wrong with the following code

    - by giri
    Hi i am trying to send sms to my mobile using java.When I run the application I am getting the the follwing error. package HelloWorld; import java.io.*; import java.util.BitSet; import javax.comm.*; import java.lang.*; public class SerialToGsm { InputStream in; OutputStream out; String lastIndexRead; String senderNum; String smsMsg; SerialToGsm(String porta) { try { // CommPortIdentifier portId = CommPortIdentifier.getPortIdentifier("serial0"); CommPortIdentifier portId = CommPortIdentifier.getPortIdentifier(porta); SerialPort sp = (SerialPort)portId.open("Sms_GSM", 0); sp.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); sp.setFlowControlMode(sp.FLOWCONTROL_NONE); in = sp.getInputStream(); out = sp.getOutputStream(); // modem reset sendAndRecv("+++AT", 30); // delay for 20 sec/10 sendAndRecv("AT&F", 30); sendAndRecv("ATE0", 30); // echo off sendAndRecv("AT +CMEE=1", 30); // verbose error messages sendAndRecv("AT+CMGF=0", 70); // set pdu mode // sendAndRecv("AT V1E0S0=0&D2&C1", 1000000); } catch (Exception e) { System.out.println("Exception " + e); System.exit(1); } } private String sendAndRecv(String s, int timeout) { try { // clean serial port input buffer in.skip(in.available()); System.out.println("=> " + s); s = s + "\r"; // add CR out.write(s.getBytes()); out.flush(); String strIn = new String(); for (int i = 0; i < timeout; i++){ int numChars = in.available(); if (numChars > 0) { byte[] bb = new byte[numChars]; in.read(bb,0,numChars); strIn += new String(bb); } // start exit conditions // --------------------- if (strIn.indexOf(">\r\n") != -1) { break; } if (strIn.indexOf("OK\r\n") != -1){ break; } if (strIn.indexOf("ERROR") != -1) { // if find 'error' wait for CR+LF if (strIn.indexOf("\r\n",strIn.indexOf("ERROR") + 1) != -1) { break; } } Thread.sleep(100); // delay 1/10 sec } System.out.println("<= " + strIn); if (strIn.length() == 0) { return "ERROR: len 0"; } return strIn; } catch (Exception e) { System.out.println("send e recv Exception " + e); return "ERROR: send e recv Exception"; } } public String sendSms (String numToSend, String whatToSend) { ComputSmsData sms = new ComputSmsData(); sms.setAsciiTxt(whatToSend); sms.setTelNum(numToSend); // sms.setSMSCTelNum("+393359609600"); // SC fixed String s = new String(); s = sendAndRecv("AT+CMGS=" + (sms.getCompletePduData().length() / 2) + "\r", 30); // System.out.println("==> AT+CMGS=" + (sms.getCompletePduData().length() / 2)); // System.out.println("<== " + s); if (s.indexOf(">") != -1) { // s = sendAndRecv(sms.getSMSCPduData() + sms.getCompletePduData() + "\u001A"); // usefull one day? // System.out.println("Inviero questo >>>> " + sms.getCompletePduData()); // if this sintax won't work try remove 00 prefix s = sendAndRecv("00" + sms.getCompletePduData() + "\u001A", 150); // System.out.println("<== " + s); return s; } else { return "ERROR"; } } // used to reset message data private void resetGsmObj() { lastIndexRead = null; senderNum = null; smsMsg = null; } public String checkSms (){ String str = new String(); String strGsm = new String(); strGsm = sendAndRecv("AT+CMGL=0", 30); // list unread msg and sign them as read // if answer contain ERROR then ERROR if (strGsm.indexOf("ERROR") != -1) { resetGsmObj(); return strGsm; // error } strGsm = sendAndRecv("AT+CMGL=1", 30); // list read msg // if answer contain ERROR then ERROR if (strGsm.indexOf("ERROR") != -1) { resetGsmObj(); return strGsm; // error } // evaluate message index if (strGsm.indexOf(':') <= 0) { resetGsmObj(); return ("ERROR unexpected answer"); } str = strGsm.substring(strGsm.indexOf(':') + 1,strGsm.indexOf(',')); str = str.trim(); // remove white spaces // System.out.println("Index: " + str); lastIndexRead = str; // find message string // ------------------- // look for start point (search \r, then skip \n, add and one more for right char int startPoint = strGsm.indexOf("\r",(strGsm.indexOf(":") + 1)) + 2; int endPoint = strGsm.indexOf("\r",startPoint + 1); if (endPoint == -1) { // only one message endPoint = strGsm.length(); } // extract string str = strGsm.substring(startPoint, endPoint); System.out.println("String to be decoded :" + str); ComputSmsData sms = new ComputSmsData(); sms.setRcvdPdu(str); // SMSCNum = new String(sms.getRcvdPduSMSC()); senderNum = new String(sms.getRcvdSenderNumber()); smsMsg = new String(sms.getRcvdPduTxt()); System.out.println("SMSC number: " + sms.getRcvdPduSMSC()); System.out.println("Sender number: " + sms.getRcvdSenderNumber()); System.out.println("Message: " + sms.getRcvdPduTxt()); return "OK"; } public String readSmsSender() { return senderNum; } public String readSms() { return smsMsg; } public String delSms() { if (lastIndexRead != "") { return sendAndRecv("AT+CMGD=" + lastIndexRead, 30); } return ("ERROR"); } } ERROR: Error loading SolarisSerial: java.lang.UnsatisfiedLinkError: no SolarisSerialParallel in java.library.path Caught java.lang.UnsatisfiedLinkError: com.sun.comm.SolarisDriver.readRegistrySerial(Ljava/util/Vector;Ljava/lang/String;)I while loading driver com.sun.comm.SolarisDriver Exception javax.comm.NoSuchPortException

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  • May I open my own device driver twice simultanoiusly from a user program under Linux?

    - by Viktor Gyuris
    Somewhere I read that opening the same file twice has an undefined semantics and should be avoided. In my situation I would like to open my own device multiple times associating multiple file descriptors to it. The file operations of my device are all safe. Is there some part of Linux between the sys call open() and the point it calls the registered file operation .open() that is unsafe?

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  • Query in Datareader

    - by bala
    Hi All, In the below code, using (SqlDataReader dr = com.ExecuteReader(CommandBehavior.CloseConnection)) { while (dr.Read()) { _emailTemplate.EmailContent = dr["EMAILCONTENT"].ToString(); _emailTemplate.From = dr["EMAILFROM"].ToString(); _emailTemplate.Subject = dr["EMAILSUBJECT"].ToString(); } } I understand CommandBehavior.CloseConnection will close the connection object when datareader is closed. In the above code, when we use using with SqlDataReader, will it close the datareader before disposing it? in other other words, if i use using statement do i need to close the datareader manually?

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  • Possible uncommitted transactions causing "System.Data.SqlClient.SqlException: Timeout expired" erro

    - by Michael
    My application requires a user to log in and allows them to edit a list of things. However, it seems that if the same user always logs in and out and edits the list, this user will run into a "System.Data.SqlClient.SqlException: Timeout expired." error. I've read comments about increasing the timeout period but I've also read a comment about it possibly caused by uncommitted transactions. And I do have one going in the application. I'll provide the code I'm working with and there is an IF statement in there that I was a little iffy about but it seemed like a reasonable thing to do. I'll just go over what's going on here, there is a list of objects to update or add into the database. New objects created in the application are given an ID of 0 while existing objects have their own ID's generated from the DB. If the user chooses to delete some objects, their IDs are stored in a separate list of Integers. Once the user is ready to save their changes, the two lists are passed into this method. By use of the IF statement, objects with ID of 0 are added (using the Add stored procedure) and those objects with non-zero IDs are updated (using the Update stored procedure). After all this, a FOR loop goes through all the integers in the "removal" list and uses the Delete stored procedure to remove them. A transaction is used for all this. Public Shared Sub UpdateSomethings(ByVal SomethingList As List(Of Something), ByVal RemovalList As List(Of Integer)) Using DBConnection As New SqlConnection(conn) DBConnection.Open() Dim MyTransaction As SqlTransaction MyTransaction = DBConnection.BeginTransaction() Try For Each SomethingItem As Something In SomethingList Using MyCommand As New SqlCommand() MyCommand.Connection = DBConnection If SomethingItem.ID > 0 Then MyCommand.CommandText = "UpdateSomething" Else MyCommand.CommandText = "AddSomething" End If MyCommand.Transaction = MyTransaction MyCommand.CommandType = CommandType.StoredProcedure With MyCommand.Parameters If MyCommand.CommandText = "UpdateSomething" Then .Add("@id", SqlDbType.Int).Value = SomethingItem.ID End If .Add("@stuff", SqlDbType.Varchar).Value = SomethingItem.Stuff End With MyCommand.ExecuteNonQuery() End Using Next For Each ID As Integer In RemovalList Using MyCommand As New SqlCommand("DeleteSomething", DBConnection) MyCommand.Transaction = MyTransaction MyCommand.CommandType = CommandType.StoredProcedure With MyCommand.Parameters .Add("@id", SqlDbType.Int).Value = ID End With MyCommand.ExecuteNonQuery() End Using Next MyTransaction.Commit() Catch ex As Exception MyTransaction.Rollback() 'Exception handling goes here End Try End Using End Sub There are three stored procedures used here as well as some looping so I can see how something can be holding everything up if the list is large enough. Other users can log in to the system at the same time just fine though. I'm using Visual Studio 2008 to debug and am using SQL Server 2000 for the DB.

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  • Beautiful Soup Unicode encode error

    - by iamrohitbanga
    I am trying the following code with a particular HTML file from BeautifulSoup import BeautifulSoup import re import codecs import sys f = open('test1.html') html = f.read() soup = BeautifulSoup(html) body = soup.body.contents para = soup.findAll('p') print str(para).encode('utf-8') I get the following error: UnicodeEncodeError: 'ascii' codec can't encode character u'\u2019' in position 9: ordinal not in range(128) How do I debug this?

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  • Disadvantages of scanf

    - by karthi-27
    Hi all, I want to know the disadvantage of the scanf.In many of a sites I have read that using scanf will cause buffer overflow some times.What is the reason for that , and is there any other drawbacks with scanf .

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  • Books for experienced .NET developer learning PHP/MySQL

    - by webworm
    Hi All, I am an experienced .NET developer (C#/ASP.NET) looking to broaden my skills to the PHP/MySQL arena. I would like get recommendations on books for learning PHP/MySQL that are geared towards someone who is already familiar with object oriented programming and web development. I do realize that there are lots of online material out there but I am looking for an actual print book I can read. Thanks a bunch.

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  • Using Django CMS

    - by samrin
    Hi, I know python and have just read a basic intro of django. I have to built something like a travel website with real time updates. Will django be sufficent for this? Somebody advised me to look at django-CMS, I couldn't find a very beginner's tutorial there. Should I opt for django-CMS? Also how much of django should i know before i can try out django-cms? Thanks

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  • Setting up web page width

    - by RPK
    I am new to web-design. I want to set the page-width so that it appears well in a 800x600 resolution screen. I normally use Tables but I read somewhere that excessive use of Tables slows the performance of the website. What other thing I can use and how to set the width?

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  • Generate reasonable length license key with asymmetric encryption?

    - by starkos
    I've been looking at this all day. I probably should have walked away from it hours ago; I might be missing something obvious at this point. Short version: Is there a way to generate and boil down an asymmetrically encrypted hash to a reasonable number of unambiguous, human readable characters? Long version: I want to generate license keys for my software. I would like these keys to be of a reasonable length (25-36 characters) and easily read and entered by a human (so avoid ambiguous characters like the number 0 and the capital letter O). Finally--and this seems to be the kicker--I'd really like to use asymmetric encryption to make it more difficult to generate new keys. I've got the general approach: concatenate my information (user name, product version, a salt) into a string and generate a SHA1() hash from that, then encrypt the hash with my private key. On the client, build the SHA1() hash from the same information, then decrypt the license with the public key and see if I've got a match. Since this is a Mac app, I looked at AquaticPrime, but that generates a relatively large license file rather than a string. I can work with that if I must, but as a user I really like the convenience of a license key that I can read and print. I also looked at CocoaFob which does generate a key, but it is so long that I'd want to deliver it as a file anyway. I fooled around with OpenSSL for a while but couldn't come up with anything of a reasonable length. So...am I missing something obvious here? Is there a way to generate and boil down an asymmetrically encrypted hash to a reasonable number of unambiguous, human readable characters? I'm open to buying a solution. But I work on a number of different of platforms, so I'd want something portable. Everything I've looked at so far has been platform specific. Many, many thanks for a solution! PS - Yes, I know it will still be cracked. I'm trying to come up with something reasonable that, as a user, I would still find friendly.

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  • SIMPLE file reading in Perl

    - by Befall
    Hey guys, The other answered questions were a bit complicated for me, as I'm extremely new to using Perl. I'm curious how Perl reads in the files, how to tell it to advance to the next line in the text file, and how to make it read all lines in the .txt file until, for example, it reaches item "banana". Any and all help would be appreciated, thanks!

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  • How to Add an Attachment to a User Story using Rally REST .NET

    - by user1373451
    We're in the process of porting our .NET Rally code from SOAP to the REST .NET API. One thing I'm looking to replicate is the ability to upload attachments. I'm following a very similar procedure as to the one outlined in this posting: Rally SOAP API - How do I add an attachment to a Hierarchical Requirement Whereby the image is read into a System.Drawing.Image. We use the ImageToBase64 function to convert the image to a byte array which then gets assigned to the AttachmentContent, which is created first. Then, the Attachment gets created, and wired up to both AttachmentContent, and the HierarchicalRequirement. All of the creation events work great. A new attachment called "Image.png" gets created on the Story. However, when I download the resulting attachment from Rally, Image.png has zero bytes! I've tried this with different images, JPEG's, PNG's, etc. all with the same results. An excerpt of the code showing the process is included below. Is there something obvious that I'm missing? Thanks in advance. // .... Read content into a System.Drawing.Image.... // Convert Image to Base64 format byte[] imageBase64Format = ImageToBase64(imageObject, System.Drawing.Imaging.ImageFormat.Png); var imageLength = imageBase64Format.Length; // AttachmentContent DynamicJsonObject attachmentContent = new DynamicJsonObject(); attachmentContent["Content"] = imageBase64Format; CreateResult cr = restApi.Create("AttachmentContent", myAttachmentContent); String contentRef = cr.Reference; Console.WriteLine("Created: " + contentRef); // Tee up attachment DynamicJsonObject newAttachment = new DynamicJsonObject(); newAttachment["Artifact"] = story; newAttachment["Content"] = attachmentContent; newAttachment["Name"] = "Image.png"; newAttachment["ContentType"] = "image/png"; newAttachment["Size"] = imageLength; newAttachment["User"] = user; cr = restApi.Create("Attachment", newAttachment); String attachRef = attachRef.Reference; Console.WriteLine("Created: " + attachRef); } public static byte[] ImageToBase64(Image image, System.Drawing.Imaging.ImageFormat format) { using (MemoryStream ms = new MemoryStream()) { image.Save(ms, format); // Convert Image to byte[] byte[] imageBytes = ms.ToArray(); return imageBytes; } }

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  • Which are the good ASP.NET MVC 2 books?

    - by Dan Dumitru
    I'm sorry for asking yet another "best [insert-technology] book". I know a bit of MVC, I want to start a project in MVC 2 and a good book would be really helpful. Usually, after a while, people come to a consensus what are the top 2-3 books for learning a given technology. Have you read any ASP.NET MVC 2 book?

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