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  • High Usage of RAM by wxPython's GUI and need some advice to reduce it

    - by user67024
    I've recently developed a GUI in wxPython for windows platform. It contains a five tabs, 4 of them are just richTextCtrl boxes and the other one has controls for uploading files, buttons, textctrls, a slider etc.. As I was new to GUI development in Python, I used wxFormBuilder to generate some of the code using a good amount of sizers. So, now the problem is that the GUI starts off with a initial memory of around 40MB which is too much for such a simple application (Or so I think) . Also, when the functions handling the functions use huge lists as the program is for debugging large data logs and identifying the problems in'em implying that I can't afford memory for GUI. So, how can I reduce that start working memory size? Is it a general issue in wxPython? And currently trying use profilers but not sure if it's going to help.

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  • Can I remove the latest ubuntu version without having to reinstall the old version?

    - by Emily
    I was using the 2.6 kernels with no problems, but when I updated to the 3.0 kernel, my bootup failed. I can manually boot with ctrl+alt+f1 startx and my login, but admittedly, i googled this and have no idea what I'm really doing. I have been trying to figure out how to go back to the old version, and eventually figured out the grub menu--i booted from all three 2.6 (.8, .10, and .11) editions of the previous version of ubuntu but they all had the same error as the 3.0 kernal. I can get logged in manually once the boot fails, but when i get to my desktop, wireless is not responsive and will not connect, and portable hard drives do not mount and/or are unresponsive. the previous version worked perfectly. I use an asus netbook. it's an eee pc. i don't have two OSs on it. i had to go to another computer to get to the forum... If the solution is simple, i just don't know what it is.

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  • Using env variables with RewriteRule and ErrorDocument

    - by misterte
    Hi, I'm having problems with the following while config. my Apache server to Rewrite some urls. SetEnv PATH_TO_DIR /directory RewriteRule ^%{PATH_TO_DIR}/([a-zA-Z0-9_\-]+)/([a-zA-Z0-9_\-\.]+)/?$ /index.php?dir=$1&file=$2 ErrorDocument 404 %{PATH_TO_DIR}/index.php?dir=null&file=error This conf. used to work perfectly fine until I used SetEnv PATH... etc. I need to use this because there are lots of rules, not just those. Can anyone point out my mistake? Apache returns %{PATH_TO_DIR}/index.php?dir=null&file=error when I try anything (www.site.com/foo/bar for instance). Apache returns the ErrorDocument if i just try to fetch the index. I know it's not a problem with the rewrite rules because they work when I remove the PATH_TO_DIR variable and just hard code it. Thanks! A.

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  • Is there a good book to grok C++?

    - by Paperflyer
    This question got me thinking. I would say I am a pretty experienced C++ programmer. I use it a lot at work, I had some courses on it at the university, I can understand most C++ code I find out there without problems. Other languages you can pretty much learn by using them. But every time I use a new C++ library or check out some new C++ code by someone I did not know before, I discover a new set of idioms C++ has to offer. Basically, this has lead me to believe that there is a lot of stuff in C++ that might be worth knowing but that is not easily discoverable. So, is there a good book for a somewhat experienced C++ programmer to step up the game? You know, to kind of 'get' that language the way you can 'get' Ruby or Objective-C, where everything just suddenly makes sense and you start instinctively knowing 'that C++ way of thing'?

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  • /etc/X11/xorg.conf doesn't exist?

    - by BBetances
    I'm trying to get my video card properly setup to handle 3D acceleration. After searching a bit, I've come across a few howtos that tell me I need to edit my xorg.conf file. That file doesn't exist. X.org is installed by default, I'm sure, and I figured this video card would be widely supported. 00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09) Any ideas on how I can get this to work properly and play Starcraft II? Or any game for that matter? No resolution problems or anything, just no 3D rendering.

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  • Unable to enumerate USB device

    - by takeshin
    Hello, My syslog is constantly filled with messages like this: Oct 16 11:48:35 my-laptop kernel: [61470.980078] hub 1-0:1.0: unable to enumerate USB device on port 2 Oct 16 11:48:35 my-laptop kernel: [61471.192079] hub 3-0:1.0: unable to enumerate USB device on port 2 The only USB device I use is Microsoft Natural Wireless Laser Mouse 7000. The laptop model is HP dv9500, Ubuntu 10.10, but the same was in the versions before. How can I fix this? Edit: Here's the output of sudo lsusb: Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 003: ID 045e:071d Microsoft Corp. Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub All USB devices seems to be working fine. I have some problems with DVD-R and sound card, but they are not USB.

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  • DOT implementation

    - by Denis Ermolin
    I have some DOT(damage over time) implementation problems. My game runs on 30 FPS speed. Current implementation is: let's say hero cast spell which make 1 damage per second. So on every frame i do (pseudo code): damage_done = getRandomDamage() * delta_time; I accumulate damage and when it becomes more then 0 then subtract rounded damage from current health and so on. With 30 FPS and 1 DPS it will be 1/33 = 0.05... We know that floats a not precise enough to sum 30 circulating decimals and have exact 1 in the end. But HP is discrete value and that's why 1 DPS will not have 1 damage after 1 second because value will be 0.9999..... It's not so big deal when you have 100000 DPS - +/- 1 damage will not be noticeable. But if i have 1, 5 DPS? How modern RPG's implemented DOT's?

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  • My first development job working at a company, what things to look out for?

    - by Kim Jong Woo
    So I've worked on my own all this time, selling software, creating a few web applications on my own. I had an Arts background I was self taught. It was a bit difficult to find a development position after endless trying, I finally landed a LAMP position. What I realized was it was all confidence issue. Before when I didn't know a few things I panicked but after spending such a long time working on my own projects and solving various problems, I felt confident enough that I could fulfill requirements on my own. I hope this helps other people applying for jobs This is the first time I will be developing with other team members in an office, are there anything I should prepare for my first day at work next week? Any tips and pointers while working as a developer at a company? I'm kinda nervous but excited.

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  • Are there well-known examples of web products that were killed by slow service?

    - by Jeremy Wadhams
    It's a basic tenet of UX design that users prefer fast pages. http://www.useit.com/alertbox/response-times.html http://www.nytimes.com/2012/03/01/technology/impatient-web-users-flee-slow-loading-sites.html?pagewanted=all It's supposedly even baked into Google's ranking algorithm now: fast sites rank higher, all else being equal. But are there well known examples of web services where the popular narrative is "it was great, but it was so slow people took their money elsewhere"? I can pretty easily think of example problems with scale (Twitter's fail whale) or reliability (Netflix and Pinterest outages caused by a single datacenter in a storm). But can (lack of) speed really kill?

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  • Getting Black screen after installing 12.04 on new Mac Pro

    - by Matteo
    I installed Ubuntu 12.04 on my new Mac Pro. I had some problems because bootcamp did not allow me to partition the hd without a Windows cd. I inserted a Windows cd and did the partition and then I stopped the installation. I completed the installation of Ubuntu that now works. The problem is that Grub can't start Mac OS. It sees the Mac OS X in the menu but if I try to start it I have a black screen or sometime just the boot manager. Has anyone else experienced this problem?

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  • programming manner to solve problem

    - by gcc
    Everyone has style(s)/technique(s) to approach/solve real world problems. This/these technique(s) distinguish(es) us from other people or other programmers. (Actually, I think it make us a wanted/ great programmer/computer science ) To improve, we read a lot of books (ex : programming style, how to solve program, how to approach problem, software and algorithm). Can I learn your technique? In other words, if someone gives you a problem, at first step, what are you doing to solve it? (In all honesty, I want learn in what manner you are looking problem )

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  • System does not detect USB pendrives

    - by cshubhamrao
    This USB thing is driving me crazy. 2 problems in time span of 3 hours. Ok I was already trying to cope up with "wrong fs type, bad option, bad superblock" error while mounting FAT Drives when to my amazement I discovered that none of the USB Storage devices showed up in the system Useful outputs: - tail /var/log/syslog: root@shubham-pc:~# tail /var/log/syslog Nov 7 21:41:47 shubham-pc colord: device removed: sysfs-HP-v250w Nov 7 21:41:51 shubham-pc kernel: [ 3441.529542] usb 1-1: USB disconnect, device number 11 Nov 7 21:41:53 shubham-pc kernel: [ 3443.820029] usb 1-2: new high-speed USB device number 14 using ehci-pci Nov 7 21:41:54 shubham-pc kernel: [ 3443.952897] usb 1-2: New USB device found, idVendor=0781, idProduct=5530 Nov 7 21:41:54 shubham-pc kernel: [ 3443.952905] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Nov 7 21:41:54 shubham-pc kernel: [ 3443.952909] usb 1-2: Product: Cruzer Nov 7 21:41:54 shubham-pc kernel: [ 3443.952913] usb 1-2: Manufacturer: SanDisk Nov 7 21:41:54 shubham-pc kernel: [ 3443.952917] usb 1-2: SerialNumber: 20060876420EC6016847 Nov 7 21:41:54 shubham-pc mtp-probe: checking bus 1, device 14: "/sys/devices/pci0000:00/0000:00:1d.7/usb1/1-2" Nov 7 21:41:54 shubham-pc mtp-probe: bus: 1, device: 14 was not an MTP device

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  • Educause Top-Ten IT Issues - the most change in a decade or more

    - by user739873
    The Education IT Issue Panel has released the 2012 top-ten issues facing higher education IT leadership, and instead of the customary reshuffling of the same deck, the issues reflect much of the tumult and dynamism facing higher education generally.  I find it interesting (and encouraging) that at the top of this year's list is "Updating IT Professionals' Skills and Roles to Accommodate Emerging Technologies and Changing IT Management and Service Delivery Models."  This reflects, in my view, the realization that higher education IT must change in order to fully realize the potential for transforming the institution, and therefore it's people must learn new skills, understand and accept new ways of solving problems, and not be tied down by past practices or institutional inertia. What follows in the remaining 9 top issues all speak, in some form or fashion, to the need for dramatic change, but not just in the areas of "funding IT" (code for cost containment or reduction), but rather the need to increase effectiveness and efficiency of the institution through the use of technology—leveraging the wave of BYOD (Bring Your Own Device) to the institution's advantage, rather than viewing it as a threat and a problem to be contained. Although it's #10 of 10, IT Governance (and establishment and implementation of the governance model throughout the institution) is key to effectively acting upon many of the preceding issues in this year's list.  In the majority of cases, technology exists to meet the needs and requirements to effectively address many of the challenges outlined in top-ten issues list. Which brings me to my next point. Although I try not to sound too much like an Oracle commercial in these (all too infrequent) blog posts, I can't help but point out how much confluence there is between several of the top issues this year and what my colleagues and I have been evangelizing for some time. Starting from the bottom of the list up: 1) I'm gratified that research and the IT challenges it presents has made the cut.  Big Data (or Large Data as it's phased in the report) is rapidly going to overwhelm much of what exists today even at our most prepared and well-equipped research universities.  Combine large data with the significantly more stringent requirements around data preservation, archiving, sharing, curation, etc. coming from granting agencies like NSF, and you have the brewing storm that could result in a lot of "one-off" solutions to a problem that could very well be addressed collectively and "at scale."   2) Transformative effects of IT – while I see more and more examples of this, there is still much more that can be achieved. My experience tells me that culture (as the report indicates or at least poses the question) gets in the way more than technology not being up to task.  We spend too much time on "context" and not "core," and get lost in the weeds on the journey to truly transforming the institution with technology. 3) Analytics as a key element in improving various institutional outcomes.  In our work around Student Success, we see predictive "academic" analytics as essential to getting in front of the Student Success issue, regardless of how an institution or collections of institutions defines success.  Analytics must be part of the fabric of the key academic enterprise applications, not a bolt-on.  We will spend a significant amount of time on this topic during our semi-annual Education Industry Strategy Council meeting in Washington, D.C. later this month. 4) Cloud strategy for the broad range of applications in the academic enterprise.  Some of the recent work by Casey Green at the Campus Computing Survey would seem to indicate that there is movement in this area but mostly in what has been termed "below the campus" application areas such as collaboration tools, recruiting, and alumni relations.  It's time to get serious about sourcing elements of mature applications like student information systems, HR, Finance, etc. leveraging a model other than traditional on-campus custom. I've only selected a few areas of the list to highlight, but the unifying theme here (and this is where I run the risk of sounding like an Oracle commercial) is that these lofty goals cry out for partners that can bring economies of scale to bear on the problems married with a deep understanding of the nuances unique to higher education.  In a recent piece in Educause Review on Student Information Systems, the author points out that "best of breed is back". Unfortunately I am compelled to point out that best of breed is a large part of the reason we have made as little progress as we have as an industry in advancing some of the causes outlined above.  Don't confuse "integrated" and "full stack" for vendor lock-in.  The best-of-breed market forces that Ron points to ensure that solutions have to be "integratable" or they don't survive in the marketplace. However, by leveraging the efficiencies afforded by adopting solutions that are pre-integrated (and possibly metered out as a service) allows us to shed unnecessary costs – as difficult as these decisions are to make and to drive throughout the organization. Cole

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  • Cannot install vim

    - by Max Popp
    I am running ubuntu 11.10, as xubuntu, in an amd64 pc, configured as dual boot with win7 . I tried installing vim with this: sudo apt-get install vim I got these error message: "The following packages have unmet dependencies: vim : Depends: vim-common (= 2:7.3.154+hg~74503f6ee649-2ubuntu2) but 2:7.3.154+hg~74503f6ee649-2ubuntu3 is to be installed E: Unable to correct problems, you have held broken packages." I only have a very faint idea of what the problem is, and none whatsoever on how to correct this. Hope you guys can help. Thanks

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  • Ubuntu 12.4 cursor changes

    - by mantic0
    I have a weird problem with my Ubuntu 12.4 dual screen setup (Toshiba laptop + one monitor). After a while the cursor on one screen completely changes its shape (not every time). I don't really know how to describe it because it's always something else. Sometimes I get four or five vertical lines instead of a cursor, sometimes I can only see part of the cursor, etc, sometimes weird shade appears. This only happens on one screen simultaneously. If I go to the other screen, the cursor appears to be fine but when I change screens, the cursor changes. I tried to do a screenshot but when I do, the cursor looks just fine. I'm using Unity and Gnome 3 but the problem is on both desktop environments. Nothing is wrong with my screen though because I'm also using Windows and I don't have any problems there.

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  • How do I deal with code of bad quality contributed by a third party?

    - by lindelof
    I've recently been promoted into managing one of our most important projects. Most of the code in this project has been written by a partner of ours, not by ourselves. The code in question is of very questionable quality. Code duplication, global variables, 6-page long functions, hungarian notation, you name it. And it's in C. I want to do something about this problem, but I have very little leverage on our partner, especially since the code, for all its problems, "just works, doesn't it?". To make things worse, we're now nearing the end of this project and must ship soon. Our partner has committed a certain number of person-hours to this project and will not put in more hours. I would very much appreciate any advice or pointers you could give me on how to deal with this situation.

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  • Network manager indicator missing

    - by Jarmo
    I recently upgraded from 11.10 to 12.04. My first attempt failed, and I received an error stating that not all of the required packages were downloaded. Before (successfully) attempting again, I noticed that there was no longer a networking indicator in the upper panel. The indicator did not reappear with the installation of 12.04. To be clear, my wireless connection has experienced no problems, despite the missing indicator. Here are the solutions that I have found which did not work for me: Editing /etc/NetworkManager/NetworkManager.conf and replacing [ifupdown] managed=false with =true. Reinstalling network-manager (via apt-get install --reinstall). I am currently running 12.04 on an Asus Eee PC 1005 HA, and I am new to seeking solutions through forums, so I apologize if I have neglected to provide some vital information about my hardware.

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  • should i concentrate on logical and puzzles part in programming, i want to be a web (flex)developer?

    - by abhilashm86
    I'm a student not good and can't easily crack at more puzzle, complex mathematics, hard logic problems? in college i studied c++, java, oops. I'm comfortable with all syntax and writing programs and using API's and doing mashups, i can do.......... but once a friend asked help on coding contest, i was in dilemma and frustration? It was simple and complex, i could not write code for those, so got scared? Is logical ability,complex mathematics, puzzles required for a developer point of view? please help and suggest methods to achieve things......

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  • mounting external hard drive EXT4: "the unlocked device does not have a reckognizable filesystem on it"?

    - by user824924
    I'm having problems mounting ext4 partitions(inside a LUKS partition) in external drives. The drives are fine, there is no problem whatsoever with the drives and no filesystem corruption. This happened since a recent automatic system upgrade, and a manual upgrade to kernel 3.12.0. It goes like this: I plug in the external drive Passphrase is asked for luks device luks partition correctly unlocked/opened Instead of proceding with mounting the now exposed ext4 partition there's a pop-up saying: "the unlocked device does not have a recognizable filesystem on it". Same happens in this case: $ gvfs-mount -d /dev/sdc2 Enter a passphrase to unlock the volume The passphrase is needed to access encrypted data on WDC WD250... (250 GB Hard Disk). Password: Error mounting /dev/sdc2: The unlocked device does not have a recognizable file system on it Doing a manual sudo mount /dev/dm-1 /mnt/testfolder works with no errors and there is no problem with the filesystem (fscked). Also there doesn’t seem to be anything useful written to dmesg when this happens. What gives?

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  • I cannot login into any TTYs

    - by Lucio
    My system is Ubuntu 11.10. When I enter into any tty (1, 2, 3..) it ask me my login name and password but I can not move forward. It say that the info isn't correct. I have a user without password called world, so I enter world but it show me this Module invalid (or similar) The problems is that I must enter a command and I can't. There isn't any way to fix or an alternative way to enter the command?

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  • Installer says I'd need a wireless firmware, but WLAN works without it out of the box

    - by unor
    While installing 12.04.01 (Alternate) on a netbook (Samsung N150Plus), Ubuntu informed me that I'd need the firmware brcm/bcm43xx-0.fw. I skipped this step. If I understand this page correctly, the mentioned firmware is a WLAN driver. However, after the Ubuntu installation was completed, the WLAN worked out of the box. After a few minutes, Ubuntu informed me that there is a firmware update available, which would be the mentioned firmware. Do I need to install this? Is Ubuntu using some kind of "lite" WLAN driver and I might run into problems with certain networks in the future, if I don't use the firmware? Would there be benefits in using the firmware? (maybe longer runtime because of lower consumption?)

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  • OnTriggerEnter not called

    - by Lautaro
    I am working on a fight game with 3D models but played like a 2D game. So the player characters have swords. The Player GameObject has several body parts that are colider triggers. The sword is a rigidbody colider. Ive had som problems with colisions not being detected. Ive added some Debug.Log and slowed downed the animations so what i can see is this: When players are close to each other the sword connects from a different angle. The OnTriggerStay is called several times BEFORE OnTriggerEnter is called if players are too close. Sometimes if too close the OnTriggerStay is called several times but the OnTriggerEnter is NEVER called. Any ideas on why this is?

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  • Books are Dead! Long Live the Books!

    - by smisner
    We live in interesting times with regard to the availability of technical material. We have lots of free written material online in the form of vendor documentation online, forums, blogs, and Twitter. And we have written material that we can buy in the form of books, magazines, and training materials. Online videos and training – some free and some not free – are also an option. All of these formats are useful for one need or another. As an author, I pay particular attention to the demand for books, and for now I see no reason to stop authoring books. I assure you that I don’t get rich from the effort, and fortunately that is not my motivation. As someone who likes to refer to books frequently, I am still a big believer in books and have evidence from book sales that there are others like me. If I can do my part to help others learn about the technologies I work with, I will continue to produce content in a variety of formats, including books. (You can view a list of all of my books on the Publications page of my site and my online training videos at Pluralsight.) As a consumer of technical information, I prefer books because a book typically can get into a topic much more deeply than a blog post, and can provide more context than vendor documentation. It comes with a table of contents and a (hopefully accurate) index that helps me zero in on a topic of interest, and of course I can use the Search feature in digital form. Some people suggest that technology books are outdated as soon as they get published. I guess it depends on where you are with technology. Not everyone is able to upgrade to the latest and greatest version at release. I do assume, however, that the SQL Server 7.0 titles in my library have little value for me now, but I’m certain that the minute I discard the book, I’m going to want it for some reason! Meanwhile, as electronic books overtake physical books in sales, my husband is grateful that I can continue to build my collection digitally rather than physically as the books have a way of taking over significant square footage in our house! Blog posts, on the other hand, are useful for describing the scenarios that come up in real-life implementations that wouldn’t fit neatly into a book. As many years that I have working with the Microsoft BI stack, I still run into new problems that require creative thinking. Likewise, people who work with BI and other technologies that I use share what they learn through their blogs. Internet search engines help us find information in blogs that simply isn’t available anywhere else. Another great thing about blogs, also, is the connection to community and the dialog that can ensue between people with common interests. With the trend towards electronic formats for books, I imagine that we’ll see books continue to adapt to incorporate different forms of media and better ways to keep the information current. At the moment, I wish I had a better way to help readers with my last two Reporting Services books. In the case of the Microsoft® SQL Server™ 2005 Reporting Services Step by Step book, I have heard many cases of readers having problems with the sample database that shipped on CD – either the database was missing or it was corrupt. So I’ve provided a copy of the database on my site for download from http://datainspirations.com/uploads/rs2005sbsDW.zip. Then for the Microsoft® SQL Server™ 2008 Reporting Services Step by Step book, we decided to avoid the database problem by using the AdventureWorks2008 samples that Microsoft published on Codeplex (although code samples are still available on CD). We had this silly idea that the URL for the download would remain constant, but it seems that expectation was ill-founded. Currently, the sample database is found at http://msftdbprodsamples.codeplex.com/releases/view/37109 but I have no idea how long that will remain valid. My latest books (#9 and #10 which are milestones I never anticipated), Building Integrated Business Intelligence Solutions with SQL Server 2008 R2 and Office 2010 (McGraw Hill, 2011) and Business Intelligence in Microsoft SharePoint 2010 (Microsoft Press, 2011), will not ship with a CD, but will provide all code samples for download at a site maintained by the respective publishers. I expect that the URLs for the downloads for the book will remain valid, but there are lots of references to other sites that can change or disappear over time. Does that mean authors shouldn’t make reference to such sites? Personally, I think the benefits to be gained from including links are greater than the risks of the links becoming invalid at some point. Do you think the time for technology books has come to an end? Is the delivery of books in electronic format enough to keep them alive? If technological barriers were no object, what would make a book more valuable to you than other formats through which you can obtain information?

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  • Best practice in setting return value (use else or?)

    - by Deckard
    Whenever you want to return a value from a method, but whatever you return depends on some other value, you typically use branching: int calculateSomething() { if (a == b) { return x; } else { return y; } } Another way to write this is: int calculateSomething() { if (a == b) { return x; } return y; } Is there any reason to avoid one or the other? Both allow adding "else if"-clauses without problems. Both typically generate compiler errors if you add anything at the bottom. Note: I couldn't find any duplicates, although multiple questions exist about whether the accompanying curly braces should be on their own line. So let's not get into that.

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  • Alternatives to Project Euler for improving Excel ability

    - by Jonathan Deamer
    I've recently been enjoying using the mathematical problems listed at Project Euler to learn Python. My Excel ability is better than my Python, but I think I'd still benefit from the sort of inductive learning that comes with solving a series of increasingly difficult puzzles using a particular tool. I know Project Euler can be completed using Excel, but are there any other puzzle series similar to this or The Python Challenge specifically tailored for people trying to increase their knowledge of Excel and what it can do? NB. I'm not looking for a "tutorial", I know there are plenty of these. And apologies if this isn't completely appropriate for programmers.SE.com - some of the folks at SuperUser suggested it was a better fit here than there!

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