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• if i have two external hard drives connected to my computer by USB (2.0 i think) will they load with consistent letters?

  - by Bec

  (I'm using windows-7 and the hard drives are western digital with whatever formatting they came with from the factory) i'm thinking of setting up two different back-ups one through windows and one with the software that came with the drive (because windows gives me a system image but isn't very user-friendly for my files) but will my computer get confused and load them as different letters each time?

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• How can i assign a two dimensional array into other temporary two dimensional array.....?? in C Programming..

  - by AGeek

  Hi I am trying to store the contents of two dimensional array into a temporary array.... How is it possible... I don't want looping over here, as it would add an extra overhead.. Any pointer notation would be good. struct bucket { int nStrings; char strings[MAXSTRINGS][MAXWORDLENGTH]; }; void func() { char **tArray; int tLenArray = 0; for(i=0; i<TOTBUCKETS-1; i++) { if(buck[i].nStrings != 0) { tArray = buck[i].strings; tLenArray = buck[i].nStrings; } } } The error here i am getting is:- [others@centos htdocs]$ gcc lexorder.c lexorder.c: In function âlexSortingâ: lexorder.c:40: warning: assignment from incompatible pointer type Please let me know if this needs some more explanaition...

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• What makes these two R data frames not identical?

  - by Matt Parker

  UPDATE: I remembered dput() about the time Sharpie mentioned it. It's probably the row names. Back in a moment with an answer. I have two small data frames, this_tx and last_tx. They are, in every way that I can tell, completely identical. this_tx == last_tx results in a frame of identical dimensions, all TRUE. this_tx %in% last_tx, two TRUEs. Inspected visually, clearly identical. But when I call identical(this_tx, last_tx) I get a FALSE. Hilariously, even identical(str(this_tx), str(last_tx)) will return a TRUE. If I set this_tx <- last_tx, I'll get a TRUE. What is going on? I don't have the deepest understanding of R's internal mechanics, but I can't find a single difference between the two data frames. If it's relevant, the two variables in the frames are both factors - same levels, same numeric coding for the levels, both just subsets of the same original data frame. Converting them to character vectors doesn't help. Background (because I wouldn't mind help on this, either): I have records of drug treatments given to patients. Each treatment record essentially specifies a person and a date. A second table has a record for each drug and dose given during a particular treatment (usually, a few drugs are given each treatment). I'm trying to identify contiguous periods during which the person was taking the same combinations of drugs at the same doses. The best plan I've come up with is to check the treatments chronologically. If the combination of drugs and doses for treatment[i] is identical to the combination at treatment[i-1], then treatment[i] is a part of the same phase as treatment[i-1]. Of course, if I can't compare drug/dose combinations, that's right out.

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• Using Array Controllers to restrict the view in one popup depending on the selection in another. Not

  - by mjohnh

  I am working on an app that is not core data based - the data feed is a series of web services. Two arrays are created from the data feed. The first holds season data, each array object being an NSDictionary. Two of the NSDictionary entries hold the data to be displayed in the popup ('seasonName') and an id ('seasonID') that acts as a pointer (in an external table) by matches defined for that season. The second array is also a collection of NSDictionaries. Two of the entries hold the data to be displayed in the popup ('matchDescription') and the id ('matchSeasonId') that points to the seasonId defined in the NSDictionaries in first array. I have two NSPopUps. I want the first to display the season names and the second to display the matches defined for that season, depending on the selection in the first. I'm new at bindings, so excuse me if I've missed something obvious. I've tried using ArrayControllers as follows: SeasonsArrayController: content bound to appDelegate seasonsPopUpArrayData. seasonsPopup: content bound to SeasonsArrayController.arrangedObjects; content value bound to SeasonsArrayController.arrangedObjects.seasonName I see the season names fine. I can obviously follow a similar route to see the matches, but I then see them all, instead of restricting the list to the matches for the season highlighted. All the tutorials I can find seem to revolve around core data and utilise the relationships defined therein. I don't have that luxury here. Any help very gratefully received.

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• 2-column table with two foreign keys. Performance/design question.

  - by Emanuel

  Hello everyone! I recently ran into a quite complex problem and after looking around a lot I couldn't find a solution to it. I've found answers to my questions many times before on stackoverflow.com, so I decided to post here. So I'm making a user/group managment system for a web-based project, and I'm storing all related data into a postgreSQL database. This system relies on three tables: USERS GROUPS GROUP_USERS The two first tables simply define all the users and all the groups on the site, and the last table, GROUP_USERS, stores the groups every user is part of. It only has two columns: USER_ID GROUP_ID Since every user can be a member of several groups, I decided to make a separate table for this purpose, rather than storing a comma separated column in the USERS-table. Now, both columns are foreign keys, and I want to make them both primary keys as well, this since each combination of USER_ID and GROUP_ID has to be unique, and if I give them the constraint UNIQUE pgAdmin tells me that each table should have at least one Primary key. But now I am stuck with what seems to be a lot of indexes and relations to a very small table only containing numbers. In the end, I want this table to be as fast as possible, even if containing tens of thousands of rows. Size on disk shouldn't be a problem since its just all numbers anyway, but it feels quite stupid to have a full-sized index refering to a smaller table. Should I stick with my current solution, store comma-separated values in a column in the USERS-table or is there any other solution I should be aware of. PS. I don't want to use an array-column, even if they are supported by postgreSQL. I want to be as generic as possible so I can switch database later on, if necessary. EDIT: I other words, will using a compound primary key and two foreign keys in one table with only two columns have a negative impact on performance rather than the opposite due to the size of the generated index? Thank you!

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• How can I use Perl to determine whether the contents of two files are identical?

  - by Zaid

  This question comes from a need to ensure that changes I've made to code doesn't affect the values it outputs to text file. Ideally, I'd roll a sub to take in two filenames and return 1or return 0 depending on whether the contents are identical or not, whitespaces and all. Given that text-processing is Perl's forté, it should be quite easy to compare two files and determine whether they are identical or not (code below untested). use strict; use warnings; sub files_match { my ( $fileA, $fileB ) = @_; open my $file1, '<', $fileA; open my $file2, '<', $fileB; while (my $lineA = <$file1>) { next if $lineA eq <$file2>; return 0 and last; } return 1; } The only way I can think of (sans CPAN modules) is to open the two files in question, and read them in line-by-line until a difference is found. If no difference is found, the files must be identical. But this approach is limited and clumsy. What if the total lines differ in the two files? Should I open and close to determine line count, then re-open to scan the texts? Yuck. I don't see anything in perlfaq5 relating to this. I want to stay away from modules unless they come with the core Perl 5.6.1 distribution.

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• How can I convert Perl one-liners into complete scripts?

  - by Stefan Lasiewski

  I find a lot of Perl one-liners online. Sometimes I want to convert these one-liners into a script, because otherwise I'll forget the syntax of the one-liner. For example, I'm using the following command (from nagios.com): tail -f /var/log/nagios/nagios.log | perl -pe 's/(\d+)/localtime($1)/e' I'd to replace it with something like this: tail -f /var/log/nagios/nagios.log | ~/bin/nagiostime.pl However, I can't figure out the best way to quickly throw this stuff into a script. Does anyone have a quick way to throw these one-liners into a Bash or Perl script?

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• Can two Silverlight applications share IsolatedStorage on one machine?

  - by Edward Tanguay

  What identifies an application and when can two applications share IsolatedStorage if at all, i.e.: if I want to have two Silverlight applications share IsolatedStorage space, is this possible? What kind of "application id" do I need to give to do this? if I don't want two Silverlight applications to share IsolatedStorage, how do I prevent this? Do I need to do this? For instance, I've noticed when I develop a Silverlight application, I can press F5, in the application save to Isolated Storage, stop the application, press F5 again, and it reads from the same IsolatedStorage. (I would think that a new compilation would cause it to use new IsolatedStorage.) However, when I then copy the .xap and .html files to another directory and open the .html file, it does NOT share the IsolatedStorage with the application I was developing. What changed? What is going on behind the scenes here so I know when IsolatedStorage is shared and when it isn't?

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• Can I change the user id of a user on one Linux server to match another server in /etc/passwd?

  - by user76177

  I have a Rails application that is on a virtual machine (RHEL 6) and it's database is on dedicated hardware (also RHEL 6). The app server has an NFS directory from the db server mounted and accessible. It needs to write images to that server that are uploaded via the app. Background processes on the db server need to read and write to the same directory, as they perform resizing operations on the uploaded files. Right now none of this is working, because the user ids are different between the two systems. I only need this to work for this one application, so it is way too much overhead to put an LDAP system in place. Can I simply change the user id of this one user in one of the systems, or will that cause mass chaos? UPDATE: The fix worked, at least on local devices. Unfortunately the device I have mounted to the main db server still thinks my user id is 502 instead of 506. Do I need to remount that device, or is there an NFS daemon I can stop and restart to refresh it?

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• Can I install two Ubuntu versions on the same machine?

  - by Abh

  Hello, I have Ubuntu 10.10 32 bit already installed on my machine..I am using MongoDB and it does not work properly with 32 bit machine. So I want to install 64 bit Ubuntu 10.10 on my system on another partition (so that I can have both 32 bit and 64 bit versions). Is it okay to install both 32 bit and 64 bit? I mean will it give any problems? On which partition should I install the 64 bit version? My partitions are as follows: Filesystem Size Used Avail Use% Mounted on /dev/sda1 37G 11G 25G 30% / none 1.4G 260K 1.4G 1% /dev none 1.4G 776K 1.4G 1% /dev/shm none 1.4G 244K 1.4G 1% /var/run none 1.4G 0 1.4G 0% /var/lock /dev/sda6 129G 73G 50G 60% /home /dev/sda7 127G 76G 45G 64% /vol Waiting for your replies.

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• How Does One Make a Sitemap for a Flex Website?

  - by Laxmidi

  Hi, I've got a Flex website and I'm not sure how to make a sitemap for it. For a standard HTML page, sitemaps are straight forward. As Flex sites use a "pageless" architecture, I'm not sure what I should do. If anyone has any suggestions, please let me know. UPDATE: As I understand it, Google doesn't look at anything after the # in a URL. So in a deeplinked Flex site, Google wouldn't see the second page-- where it reads view=12 in the sample sitemap below. Or does Google handle sitemaps differently? Should I go ahead and make a sitemap with all of the deeplinked URLS: http://brainpinata.com/#view=12, http://brainpinata.com/#view=4, etc.           http://www.brainpinata.com/       2010-12-01       weekly       1.0           http://brainpinata.com/#view=12       2010-12-01       weekly       1.0     Thank you. -Laxmidi

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• How can I use multiple meshes per entity without breaking one component of a single type per entity?

  - by Mathias Hölzl

  We are just switching from a hierarchy based game engine to a component based game engine. My problem is that when I load a model which has has a hierarchy of meshes and the way I understand is that a entity in a component based system can not have multiple components of the same type, but I need a "meshComponent" for each mesh in a model. So how could I solve this problem. On this side they implemented a Component based game engine: http://cowboyprogramming.com/2007/01/05/evolve-your-heirachy/

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• How might one teach OO without referencing physical real-world objects?

  - by hal10001

  I remember reading somewhere that the original concepts behind OO were to find a better architecture for handling the messaging of data between multiple systems in a way that protected the state of that data. Now that is probably a poor paraphrase, but it made me wonder if there is a way of teaching OO without the (Bike, Car, Person, etc.) object analogies, and that instead focuses on the messaging aspects. If you have articles, links, books, etc., that would be helpful.

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• DNS: forward part of a managed domain to one host, but sub domain services to another (Google Apps)

  - by Paul Zee

  I was going to post this as a comment against DNS: Forward domain to another host, but I don't seem able to do that. I'm in a similar situation. I have a DNS registered/managed by enom, except with the slight twist that the domain was originally registered with enom through a Google Apps account creation. The domain currently supports a Google Apps site/account. I now want to direct the bare primary domain and www entries to a hosting provider for the website component, but leave the Google Apps setup intact for its services such as calendar, mail etc. For now, I'm leaving the domain managed by enom. Also note that when I registered my account with the hosting provider, I gave the same domain name as the existing domain (e.g. example.com), so at their end I'm working with the same domain name in cpanel, etc. In my case, the existing enom DNS entries don't have an A record for the www.example.com, or the bare example.com domain. Instead, there are 4 x @ records with the Google Apps IP Address, 2 x TXT records with what I assume are Google Apps site verification strings/tokens, and a bunch of CNAME records for the various features of Google Apps (mail, calendar, docs, sites, etc). So, my questions: How do I point the www.example.com and example.com DNS entries at enom to my web site hosting provider, while leaving the domain managed by enom, and the Google Apps services working as they are now (with the obvious exception of Google Sites)? How do I setup the example.com mail-related DNS records (MX, etc) at the web site hosting provider, so that outbound email to [email protected] gets correctly sent to the google apps mail account, and doesn't get trapped inside the pseudo domain within the hosting providers servers?

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• How do I copy packages within a PPA from one release to another? (nonsensical "same version already has published binaries" error)

  - by Scott Ritchie

  I keep getting weird errors from launchpad when I try and copy the Maverick packages to Natty for the PPA. I select the wine1.3 package (not in Ubuntu), select "copy to this PPA", and then select "rebuild the resulting binaries". This error emerges: The following source cannot be copied: wine1.3 1.3.11-0ubuntu1 in maverick (same version already has published binaries in the destination archive) I have no idea what this error means but apparently it doesn't mean there are binaries in the destination archive.

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• How can I use two Internet connections in Ubuntu?

  - by Martin

  My goal is to be able to do something like this: curl google.com --interface ppp0 curl google.com --interface p2p2 ppp0 is a DSL connection, and p2p2 is a separate direct Internet connection. Currently I can only get one of these to work at a time. When I enable one, the other one stops working. /etc/network/interfaces: # The loopback network interface auto lo iface lo inet loopback # DSL auto p2p1 iface p2p1 inet manual auto dsl-provider iface dsl-provider inet ppp pre-up /sbin/ifconfig p2p1 up # line maintained by pppoeconf provider dsl-provider # DIRECT auto p2p2 iface p2p2 inet dhcp ifconfig: lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 p2p1 Link encap:Ethernet inet6 addr: fe80::20a:ebff:fe21:99c6/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 p2p2 Link encap:Ethernet inet addr:192.168.1.101 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::20a:ebff:fe17:1249/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 ppp0 Link encap:Point-to-Point Protocol inet addr:53.193.231.167 P-t-P:53.193.224.1 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1 route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 ppp0 10.0.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2 53.193.224.1 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 p2p2 By default, only ppp0 works. If I run "route add default gw 192.168.1.1 p2p2" then I can use p2p2 but ppp0 stops working. If I then run "route add default gw 53.193.224.1 ppp0" then I can use ppp0 again but p2p2 stops working. What can I do to be able to use both interfaces selectively?

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• How does one use the built in IIS URL Rewrite SEO rule that adds trailing slash only to files that exist?

  - by Sn3akyP3t3

  The default rule template is AddTrailingSlash. I've added another condition that allows the rule to apply to directories and not files, but I'm not sure if this is industry standard. Added: The rule allows for filename that are not standard such as .mobileconfig The web.config contains this rule when the template is applied: <rule name="AddTrailingSlashRule1" enabled="true" stopProcessing="true"> <match url="(.*[^/])$" /> <conditions logicalGrouping="MatchAll" trackAllCaptures="false"> <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" /> <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" /> <add input="{REQUEST_FILENAME}" pattern="^.*\.[a-z]{1,12}" negate="true" /> </conditions> <action type="Redirect" url="{R:1}/" /> </rule>

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• CPanel - Wild card SSL - How to point *.domain.com to one root and sub.domain.com to another root

  - by Harry Muscle

  I have a wildcard (*.domain.com) SSL certificate installed on my CPanel server. I have domain.com configured to point to /domain.com as its document root and use this wildcard SSL certificate. I also have sub.domain.com configured to point to /sub.domain.com as its document root. Btw, I have not explicitly configured configured sub.domain.com to use the wildcard SSL certificate. When I go to "http://sub.domain.com" it goes to the correct document root, however my problem is that when I go to "https://sub.domain.com" it goes to the incorrect root, it goes to the root configured for the wildcard SSL. I've been trying to find information on how to go about configuring sub.domain.com to use the SSL certificate and go to the correct document root, however, so far I haven't found anything concrete. Do I use the same steps that I used for configuring the certificate for domain.com, but use the same certificate again and specify dev.domain.com as the domain that this certificate is for (instead of *.domain.com)? Or is there something else I should be doing? This is a production server, so I don't want to play around too much. I'm hoping to find the correct information before proceeding.

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• What happens if two COM classes each without a threading model are implemented in one in-proc COM se

  - by sharptooth

  Consider a situation. I have an in-proc COM server that contains two COM classes. Both classes are marked as "no threading model" in the registry - the "ThreadingModel" value is just absent. Both classes read/write the same set of global variable without any synchronization. As far as I know "no threading model" will enforce COM to disallow concurrent access to the same or different instances of the same class by different threads. Will COM prevent concurrent access to instances of the two abovementioned different classes? Do I need synchronization when accessing the global variables from two different COM classes in this situation?

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• Is having several desktop environments on one account bad?

  - by Joseph_carp

  I have gnome classic, cinnamon, unity, gnome 3, and KDE installed on my only user account because I enjoy a little change from time to time (although my favorite is gnome classic) so I installed all of these desktop environments. I heard from a friend that it could potentially cause some problems. I was also told that it would be okay if I created a separate account for each environment, but I don't want to if I don't have to. Any help is much appreciated, thank you.

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• Should each app have its own database, or should small apps be merged into one?

  - by King

  We have a bunch of small to medium sized apps, each of which has its own database (MSSQL Server). There was a suggestion that we consoldate the 'related' databases into a smaller set amount of larger databases. They don't particularly share a lot of data, they would just be under a similar business group. For example, using a 'Finance' DB to hold the tables and procedures for finance apps. Would it be appropriate to use a different schema for each app? E.g. App1.SomeTable App1.SomeOtherTable AppTwo.SomeTable What are the pros and cons of this approach? What should I watch out for? Thanks

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• How can one unlock a fully encrypted Ubuntu 11.10 system over SSH at boot?

  - by Jeff

  In previous versions of Ubuntu, and current versions of Debian, you can unlock a fully encrypted system (using dmcrypt and LUKS) at boot time over SSH. It was as easy as: Installing the encrypted system using the Ubuntu alternate installer disk or normal Debian installer disk and choosing to encrypt the system. After the system is installed, adding the dropbear and busybox packages. Updating the initram-fs to authorize your ssh key. At boot time, you'd just ssh to the machine, and do: echo -ne "keyphrase" > /lib/cryptsetup/passfifo The machine would then unlock and boot the encrypted system. Using the exact same steps on Ubuntu 11.10, I can ssh to the machine, but /lib/cryptsetup/passfifo doesn't exist. There appears to be no way to unlock the system over ssh. I'm not sure where to look to see if this functionality changed or if it was removed.

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• How do developers verify that software requirement changes in one system do not violate a requirement of downstream software systems?

  - by Peter Smith

  In my work, I do requirements gathering, analysis and design of business solutions in addition to coding. There are multiple software systems and packages, and developers are expected to work on any of them, instead of being assigned to make changes to only 1 system or just a few systems. How developers ensure they have captured all of the necessary requirements and resolved any conflicting requirements? An example of this type of scenario: Bob the developer is asked to modify the problem ticket system for a hypothetical utility repair business. They contract with a local utility company to provide this service. The old system provides a mechanism for an external customer to create a ticket indicating a problem with utility service at a particular address. There is a scheduling system and an invoicing system that is dependent on this data. Bob's new project is to modify the ticket placement system to allow for multiple addresses to entered by a landlord or other end customer with multiple properties. The invoicing system bills per ticket, but should be modified to bill per address. What practices would help Bob discover that the invoicing system needs to be changed as well? How might Bob discover what other systems in his company might need to be changed in order to support the new changes\business model? Let's say there is a documented specification for each system involved, but there are many systems and Bob is not familiar with all of them. End of example. We're often in this scenario, and we do have design reviews but management places ultimate responsibility for any defects (business process or software process) on the developer who is doing the design and the work. Some organizations seem to be better at this than others. How do they manage to detect and solve conflicting or incomplete requirements across software systems? We currently have a lot of tribal knowledge and just a few developers who understand the entire business and software chain. This seems highly ineffective and leads to problems at the requirements level.

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• How can I access one desktop session from another on the same machine?

  - by d3vid

  I want to run a desktop session as user A, and from that session access a different desktop session as user B. This way I can test, screencast or share my screen from session B, while having access to apps/resources in session A that I do not want running/visible in session B. What application can I do this with? I assume some kind of a remote desktop client/server is what I'm looking for. So far I have tried: VNC. Logged in as user A and user B. In session B run Desktop Sharing. Switched to session A. Tried to access share with Remmina. Failed. (Can get image to appear but it's frozen.) x2go. Installed server and client from stable PPA (needed a workaround for installation to succeed). Created a connection which starts then fails instantly. Discovered mailing list post suggesting that accessing localhost is not supported. On the non-remote front: VirtualBox. Created a minimal virtual machine for session B. Too resource heavy. Am I attempting the impossible? Should I be looking for something other than a remote desktop tool?

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• Best tutorial ever! Is there one just like it for XHTML and CSS...?

  - by Joshua C

  I have been learning Ruby on Rails using www.railstutorial.org, and I LOVE it! My only problem? Well, I can build the applications just fine, but my knowledge of designing the skin (CSS) of the application is limited. Is there a really good XHTML and CSS which is very similar to the Ruby on Rails Tutorial by Michael Hartl? If not, perhaps you can point me towards some of the best? Thanks, Joshua Collins P.S. Only if Michael would create a CSS and XHTML tutorial himself... sigh

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