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  • How to setup split test?

    - by John Isaacks
    I want to create a way to test different layouts on a page to see which get more conversions. For example. If I have 2 versions of a page and I send 50% to page A and 50% to page B and see which one converts more sales. So I am thinking maybe use .htaccess to rewrite half to page A and the other half to page B. But how can I do that with .htaccess is there a way? do I need to use PHP instead to do this? Also if there is a better way to do this, or any cautions I should be aware of, please let me know.

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  • hand coding a parser

    - by John Leidegren
    For all you compiler gurus, I wanna write a recursive descent parser and I wanna do it with just code. No generating lexers and parsers from some other grammar and don't tell me to read the dragon book, i'll come around to that eventually. I wanna get into the gritty details about implementing a lexer and parser for a reasonable simple langauge, say CSS. And I wanna do this right. This will probably end up being a series of questions but right now I'm starting with a lexer. Tokenization rules for CSS can be found here. I find my self writing code like this (hopefully you can infer the rest from this snippet): public CssToken ReadNext() { int val; while ((val = _reader.Read()) != -1) { var c = (char)val; switch (_stack.Top) { case ParserState.Init: if (c == ' ') { continue; // ignore } else if (c == '.') { _stack.Transition(ParserState.SubIdent, ParserState.Init); } break; case ParserState.SubIdent: if (c == '-') { _token.Append(c); } _stack.Transition(ParserState.SubNMBegin); break; What is this called? and how far off am I from something reasonable well understood? I'm trying to balence something which is fair in terms of efficiency and easy to work with, using a stack to implement some kind of state machine is working quite well, but I'm unsure how to continue like this. What I have is an input stream, from which I can read 1 character at a time. I don't do any look a head right now, I just read the character then depending on the current state try to do something with that. I'd really like to get into the mind set of writing reusable snippets of code. This Transition method is currently means to do that, it will pop the current state of the stack and then push the arguments in reverse order. That way, when I write Transition(ParserState.SubIdent, ParserState.Init) it will "call" a sub routine SubIdent which will, when complete, return to the Init state. The parser will be implemented in much the same way, currently, having everyhing in a single big method like this allows me to easily return a token when I found one, but it also forces me to keep everything in one single big method. Is there a nice way to split these tokenization rules into seperate methods? Any input/advice on the matter would be greatly appriciated!

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  • unresolved external symbol __penter referenced in function _WspiapiStrdup@4

    - by John Weldon
    I started getting this compile error after upgrading to Visual Studio 2010. Not sure if it's related, but I can't figure out what library to reference to satisfy this dependency? Is it just an API change bug or something? Microsoft (R) Program Maintenance Utility Version 10.00.30319.01 Copyright (C) Microsoft Corporation. All rights reserved. del wstest.res wstest.obj wstest.pdb wstest.ilk wstest.exe wstest.exe.manifest vc90.pdb cl -Gh -Ox -DNDEBUG -c -DCRTAPI1=_cdecl -DCRTAPI2=_cdecl -nologo -GS -D_X86_=1 -DWIN32 -D_WIN32 -W3 -D_WINNT -D_WIN32_WINNT =0x0501 -DNTDDI_VERSION=0x05010000 -D_WIN32_IE=0x0600 -DWINVER=0x0501 -D_MT -D_DLL -MDd wstest.c wstest.c link /DEBUG /DEBUGTYPE:cv -out:wstest.exe wstest.obj Ws2_32.lib Shlwapi.lib Microsoft (R) Incremental Linker Version 10.00.30319.01 Copyright (C) Microsoft Corporation. All rights reserved. wstest.obj : error LNK2019: unresolved external symbol __penter referenced in function _WspiapiStrdup@4 wstest.exe : fatal error LNK1120: 1 unresolved externals NMAKE : fatal error U1077: '"c:\program files (x86)\microsoft visual studio 10.0\vc\bin\link.EXE"' : return code '0x460' Stop.

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  • What is the maximum sandbox size on iPad?

    - by John Alexander
    I'm writing an iPad app that acts as a media player (video and photos). I know there is a 2GB size limit on apps, however is this the size limit on an app when downloaded? Or the limit on the size of your sandbox throughout the life of the app? For example what if my small app later on downloads various media files to its sandbox that put the user over 2GB total (app + downloaded media)? Thanks!

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  • built-in schema datatype for html / xhtml

    - by John Clements
    Is there a built-in schema datatype for xhtml data? Suppose I want to specify a "boozle" element that contains two "woozles", each of which is arbitrary xhtml. I want to write something like this, using the relax NG compact syntax: namespace nifty = "http://brinckerhoff.org/nifty/" start = element nifty:boozle {woozle, woozle} woozle = element nifty:woozle {xhtml} Unfortunately, xmllint then signals this error: ./lab.rng:43: element ref: Relax-NG parser error : Reference xhtml has no matching definition ./lab.rng:43: element ref: Relax-NG parser error : Internal found no define for ref xhtml So my question is this: is there something sensible that I should put in place of "xhtml" above?

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  • Error Galleria IE7

    - by John the horn
    I am using galleria for my site [Minavet.ro][1] [1]: http://minavet.ro and this error comes up is IE7 Line:219079877 Char:2 Error:Expected identifier, string number code:0 url:http://minavet.ro Thx for your time I have given the images width and height and now the error is Line:222704333 Char:2 Error:Expected identifier, string number code:0 url:http://minavet.ro

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  • How can something like BOSH be implemented using Java Servlets

    - by John
    BOSH (Bidirectional-streams Over Synchronous HTTP) is a sneaky way of implementing 2-way client-server communication in situations where true server-push is not allowed, most obviously to let a server push data to a browser client without having to use client polling. It works by the client sending a request to the server, and the server doesn't respond immediately... rather it remembers the request but only responds when it has some data to send. When this happens the client immediately sends another request so there is virtually always a 'stored request' sitting on the server ready to push data to the client. At least, that's how I think it works! My question is how you can do this using a Java EE stack i.e standard servlets. I'm rusty with them, is it allowed to send no response and cache the request somehow? If anyone could share (pseudo) code what a servlet class for handling BOSH might look like, I'd be real grateful.

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  • Centos 5.5 [Read-only file system] issue after rebooting

    - by canu johann
    I have a virtual server under centos 5.5 (hosted by a japanese company called sakura ) Since yesterday, connection through ssh couldn't be established. I've contacted support center who told me to restart VS from the control panel. After restarting, I got the message below Connected to domain wwwxxxxxx.sakura.ne.jp Escape character is ^] [ OK ] Setting hostname localhost.localdomain: [ OK ] Setting up Logical Volume Management: No volume groups found [ OK ] Checking filesystems Checking all file systems. [/sbin/fsck.ext4 (1) -- /] fsck.ext4 -a /dev/vda3 / contains a file system with errors, check forced. /: Inodes that were part of a corrupted orphan linked list found. /: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY. (i.e., without -a or -p options) @@cat: /proc/self/attr/current: Invalid argument Welcome to CentOS Starting udev: @[ OK ] Setting hostname localhost.localdomain: [ OK ] Setting up Logical Volume Management: No volume groups found [ OK ] Checking filesystems Checking all file systems. [/sbin/fsck.ext4 (1) -- /] fsck.ext4 -a /dev/vda3 / contains a file system with errors, check forced. /: Inodes that were part of a corrupted orphan linked list found. /: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY. (i.e., without -a or -p options) [FAILED] *** An error occurred during the file system check. *** Dropping you to a shell; the system will reboot *** when you leave the shell. *** Warning -- SELinux is active *** Disabling security enforcement for system recovery. *** Run 'setenforce 1' to reenable. /etc/rc.d/rc.sysinit: line 53: /selinux/enforce: Read-only file system Give root password for maintenance (or type Control-D to continue): bash: cannot set terminal process group (-1): Inappropriate ioctl for device bash: no job control in this shell bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system (Repair filesystem) 1 # setenforce 1 setenforce: SELinux is disabled (Repair filesystem) 2 # echo 1 (Repair filesystem) 4 # /etc/init.d/sshd status openssh-daemon is stopped (Repair filesystem) 5 # /etc/init.d/sshd start Starting sshd: NET: Registered protocol family 10 lo: Disabled Privacy Extensions touch: cannot touch `/var/lock/subsys/sshd': Read-only file system (Repair filesystem) 6 # sudo /etc/init.d/sshd start sudo: sorry, you must have a tty to run sudo (Repair filesystem) 7 # I have 4 site in production and I need to restart the server quickly (SSH + HTTPD ,...). Thank you for your time.

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  • Single Form with Multiple Dynamic Buttons

    - by John Reilly
    I've spent hours/days trying to figure this out and now I'm completely perplexed so I thought I'd give stackoverflow a try. I'm (a newb) working in Java/JSP using Eclipse hosting on Google App Engine trying to develop an app for a volunteer organization I'm a member of. Rather than embarrass myself by showing my current code I'd love just a nudge in the right direction. I have a form (which doubles as a report basically) showing "people" grouped under the "task" they are currently working on. I would like to select multiple people from multiple tasks and reassign them to another task e.g. Bill and Jane are Gardening, Jeff is Painting. I want to select Jane and Jeff (all people have an associated checkbox in the form) and re-assign them to Sweeping (which is a task on the form but has no people assigned to it yet). Ideally, the re-assignment to Sweeping would be via a Sweeping button (each task would have a dynamically-created task button) that would pass the "Sweeping" value to a servlet along with an array or list of people whose checkbox has been checked. The servlet would handle the request (creating an Assignment "object/entity" with timeStamp, personId, taskId) and then re-direct back to the form/report which would then repaint with the current tasks/people generated from the Assignments class in the datastore. All the tasks are user-defined and retrieved from the database when building the form. Ditto the people. I've been trying to keep the jsp for presentation and the servlets for the processing but I'm no purist and would just like to get unstuck. Many thanks in advance for your assistance.

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  • Convert json to a string using jquery

    - by becomingGuru
    I have a nested json. I want to post it as a form input value. But, seems like jquery puts "Object object" string into the value. It seems easier to pass around the string and convert into the native form I need, than dealing with json as I don't need to change anything once it is generated. What is the simplest way to convert a json var json = { "firstName": "John", "lastName": "Smith", "age": 25, "address": { "streetAddress": "21 2nd Street", "city": "New York", "state": "NY", "postalCode": "10021" }, "phoneNumber": [ { "type": "home", "number": "212 555-1234" }, { "type": "fax", "number": "646 555-4567" } ], "newSubscription": false, "companyName": null }; into its string form? var json = '{ "firstName": "John", "lastName": "Smith", "age": 25, "address": { "streetAddress": "21 2nd Street", "city": "New York", "state": "NY", "postalCode": "10021" }, "phoneNumber": [ { "type": "home", "number": "212 555-1234" }, { "type": "fax", "number": "646 555-4567" } ], "newSubscription": false, "companyName": null }' Following doesn't do what I need: Json.stringify()

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  • How to boot RHEL with no bash?

    - by nmelmun
    How can I boot a RHEL VM if I deleted /bin/bash? When trying to boot, I now get the following error: "INIT: Cannot execute "/etc/rc/d/rc.sysinit" The next thing I tried was to modify the kernel boot parameters by adding init=/bin/ksh at the end of the line, which gave me a functional shell. After this, in order to get write permissions, I remounted the root partition with: mount -o remount,rw / Then I tried to boot using ksh as the shell by tricking the system into thinking it's bash: ln -s /bin/ksh /bin/bash Then restarted the system normally. Unfortunately this didnt work since ksh is not compatible and /etc/rc.d/rc.sysinit uses several bash-specific tricks. Does anyone else have a suggestion on how I could get the system to boot normally without reinstalling bash?

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  • Adding "Next Topic" and "Previous Topic" Buttons to 130 webpages, code not working unless alerted fi

    - by John Guise
    I have put "Next Topic" and "Previous Topic" ( fixed)on each web page so you can click to move one page back or forward through the web site. Here is the code: $(document).ready(function($){ $("#fixed").prepend(''); $("#fixed").prepend(''); $('#nt').css({'position':'relative','top':'0','left':'24px','font-size':'9px'}); $('#pt').css({'position':'relative','top':'0','left':'0','font-size':'9px'}); var fname = document.location.href; var thistopic = (fname).split('/').pop(); alert(thistopic); var nexttopic = $('#jsddm li a'); nexttopic.each(function(index) { var ref = $(this).attr('href'); if (ref == thistopic){ var num =(index) }else{ return; } var flnk =($(nexttopic)[num+1].getAttribute('href', 2)); var blnk =($(nexttopic)[num-1].getAttribute('href', 2)); $('#nt').live('click', function(){ location.href=flnk; }); $('#pt').live('click', function(){ location.href=blnk; }); }); }); id=nt is the "Next Topic" Button,id=pt is the "Previous Topic" Button flnk is the HREF of the next topic page, blnk is the HREF of the prvious topic page. HREFs are grabbed from - ul#jsddm li ul li a - a large unordered list menu. This code works correctly if I have the eighth line included "alert(nexttopic)" If I take this line out (which I want to, as I do not want alert box popping up) - then the code will not work. Can anybody put me right please, so the buttons work without "alert(nexttopic)" line included

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  • I'm looking for a better solution on importing catalog data into Adobe InDesign

    - by John Thompson
    The last time I produced a catalog I used a software called EasyCatalog that worked with Adobe InDesign to merge data from a spreadsheet with graphics. I wouldn’t say it was completely successful. I know of one other catalog building software called Catalog Builder by Computer Pundits. I'm just looking for any suggestions from someone who might have gone through this process on what software I should use.

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  • Finding duplicate values in a SQL table - ADVANCED

    - by Alex
    It's easy to find duplicates with one field SELECT name, COUNT(email) FROM users GROUP BY email HAVING ( COUNT(email) > 1 ) So if we have a table ID NAME EMAIL 1 John [email protected] 2 Sam [email protected] 3 Tom [email protected] 4 Bob [email protected] 5 Tom [email protected] This query will give us John, Sam, Tom, Tom because they all have the same e-mails. But what I want, is to get duplicates with the same e-mails and names. I want to get Tom, Tom. I made a mistake, and allowed to insert duplicate name and e-mail values. Now I need to remove/change the duplicates. But I need to find them first.

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  • Hausman Test, Fixed/random effects in SAS?

    - by John
    Hey guys, I'm trying to do a fixed effecs OLS regression, a random effects OLS Regression and a Hausman test to back up my choice for one of those models. Alas, there does not seem to be a lot of information of what the code looks like when you want to do this. I found for the Hausman test that proc model data=one out=fiml2; endogenous y1 y2; y1 = py2 * y2 + px1 * x1 + interc; y2 = py1* y1 + pz1 * z1 + d2; fit y1 y2 / ols 2sls hausman; instruments x1 z1; run; you do something like this. However, I do not have the equations in the middle, which i assume to be the fixed and random effects models? On an other site I found that PROC TSCSREG automatically displays the Hausman test, unfortunately this does not work either. When I type PROC TSCSREG data = clean; data does not become blue meaning SAS does not recognize this as a type of data input? proc tscsreg data = clean; var nof capm_erm sigma cv fvyrgro meanest tvol bmratio size ab; run; I tried this but obviously doesn't work since it does not recognize the data input, I've been searching but I can't seem to find a proper example of how the code of an hausman test looks like. On the SAS site I neither find the code one has to use to perform a fixed/random effects model. My data has 1784 observations, 578 different firms (cross section?) and spans over a 2001-2006 period in months. Any help?

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  • Fixed income data online

    - by John Smith
    I am looking for a resource to download fixed income data online, much like there is access to stock data from yahoo. At the very least I'd like the treasury bonds. I use python, but any help would be appreciated.

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  • MySQL Select problems

    - by John Nuñez
    Table #1: qa_returns_items Table #2: qa_returns_residues I have a long time trying to get this Result: item_code - item_quantity 2 - 1 3 - 2 IF qa_returns_items.item_code = qa_returns_residues.item_code AND status_code = 11 THEN item_quantity = qa_returns_items.item_quantity - qa_returns_residues.item_quantity ELSEIF qa_returns_items.item_code = qa_returns_residues.item_code AND status_code = 12 THEN item_quantity = qa_returns_items.item_quantity + qa_returns_residues.item_quantity ELSE show diferendes END IF I tried this Query: select SubQueryAlias.item_code, total_ecuation, SubQueryAlias.item_unitprice, SubQueryAlias.item_unitprice * total_ecuation as item_subtotal, item_discount, (SubQueryAlias.item_unitprice * total_ecuation) - item_discount as item_total from ( select ri.item_code , case status_code when 11 then ri.item_quantity - rr.item_quantity when 12 then ri.item_quantity + rr.item_quantity end as total_ecuation , rr.item_unitprice , rr.item_quantity , rr.item_discount * rr.item_quantity as item_discount from qa_returns_residues rr left join qa_returns_items ri on ri.item_code = rr.item_code WHERE ri.returnlog_code = 1 ) as SubQueryAlias where total_ecuation > 0 GROUP BY (item_code); The query returns this result: item_code - item_quantity 1 - 2 2 - 2

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  • Merging datasets based on 2 variables in SAS.

    - by John
    Hye Guys, my question is the following, i'm working with different databases, all contain information about 1000+ companies, a company is defined by its ticker code (the short version of the name( Ford as F) usually seen on stock quotation boards). Aside from the ticker code to merge on I also have to merge on the time, I used month as a count variable throughout my time series. The final purpose is to have a regression in the kind of Y(jt) = c + X(jt) +X1(jt) etc with j = company (ticker) and t = time (month). So imagine I have 2 databases, one which is the base database with variables such as Tickers, months, beta's of a company (risk measure) etc and a second database which has an extra variable (let's say market capitalisation). What I want to do then is to merge these 2 databases based on the ticker and the month. Example: Base database: Ticker __ Month __ Betas AA __ 4 __ 1.2 BB __ 8 __ 1.18 Second database: Ticker __ Month __ MCAP AA __ 4 __ 8542 BB __ 6 __ 1245 Then after merge I would like to have something like this: Ticker __ Month _ Betas ___ MCAP AA __ 4 _ 1.2 ___ 8542 So all observations that do not match BOTH date and ticker have to be dropped, I'm sure this is possible, just can't find the right type of code. Thanks! PS: I'm guessing the underscars have something to do with font layout but both the bold as italic is supposed to be normal :)

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  • R: How to tell lapply to ignore an error and process the next thing in the list?

    - by John
    I have an example function below that reads in a date as a string and returns it as a date object. If it reads a string that it cannot convert to a date, it returns an error. testFunction <- function (date_in) { return(as.Date(date_in)) } testFunction("2010-04-06") # this works fine testFunction("foo") # this returns an error Now, I want to use lapply and apply this function over a list of dates: dates1 = c("2010-04-06", "2010-04-07", "2010-04-08") lapply(dates1, testFunction) # this works fine But if I want to apply the function over a list when one string in the middle of two good dates returns an error, what is the best way to deal with this? dates2 = c("2010-04-06", "foo", "2010-04-08") lapply(dates2, testFunction) I presume that I want a try catch in there, but is there a way to catch the error for the "foo" string whilst asking lapply to continue and read the third date?

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  • HttpContext.Current.Request.UserHostName is empty when called from a class

    - by John Galt
    I have various web pages that need to build up a URL to display or place it in an emitted email message. The code I inherited had this value for the name of the webserver in a Public Const in a Public Class called FixedConstants. For example: Public Const cdServerName As String = "WEBSERVERNAME" Trying to improve on this, I wrote this: Public Class UIFunction Public Shared myhttpcontext As HttpContext Public Shared Function cdWebServer() As String Dim s As New StringBuilder("http://") Dim h As String h = String.Empty Try h = Current.Request.ServerVariables("REMOTE_HOST").ToString() Catch ex As Exception Dim m As String m = ex.Message.ToString() 'Ignore this should-not-occur thingy End Try If h = String.Empty Then h = "SomeWebServer" End If s.Append(h) s.Append("/") Return s.ToString() End Function I've tried different things while debugging such as HttpContext.Current.Request.UserHostName and I always get an empty string which pumps out my default string "SomeWebServer". I know Request.UserHostName or Request.ServerVariables("REMOTE_HOST") works when invoked from a page but why does this return empty when invoked from a called method of a class file (i.e. UIFunction.vb)?

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