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• matplotlib - changing rect colours on the fly

  - by Nick

  I am playing with matplotlib - I have a bar chart, and I want to highlight the bar which user clicks. I have a callback that goes through a rect collection (the one I got from self.axis.bar(...)) and finds out which one was clicked (looking at the coordinates). At this point I want to call something to change the colour of the current bar. Is it possible? How do I do that?

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• Wierd Windows File Share Behavior

  - by CT

  Scratching my head awhile on this. I'm on a Vista client trying to access a file share running on a Windows Server 2008 R2 box. Windows Active Directory Domain. The shares I am trying to access: \\Server1\FileShare1\Folder1\foo and \\Server1\FileShare1\Folder1\bar The client does not have any permissions at Folder1. The client has read permissions at folders foo and bar. In this example I can access \Server1\FileShare1\Folder1\foo but I get the following error when I try to access \Server1\FileShare1\Folder1\bar: "Network Error: Windows cannot access \Server1\FileShare1\Folder1\bar. Check the spelling of the name. Otherwise, there might be a problem with your network. To try to identify and resolve network problems, click Diagnose" I hit Diagnose. It returns with "Windows checked the path and '\Server1\FileShare1' is correct but 'Folder1' could not be found." What is going on? It finds Folder1 fine when going to \Server1\FileShare1\Folder1\foo.

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• Why is piping dd through gzip so much faster than a direct copy?

  - by Foo Bar

  I wanted to backup a path from a computer in my network to another computer in the same network over a 100MBit/s line. For this I did dd if=/local/path of=/remote/path/in/local/network/backup.img which gave me a very low network transfer speed of something about 50 to 100 kB/s, which would have taken forever. So I stopped it and decided to try gzipping it on the fly to make it much smaller so that the amount to transfer is less. So I did dd if=/local/folder | gzip > /remote/path/in/local/network/backup.img.gz But now I get something like 1 MB/s network transfer speed, so a factor of 10 to 20 faster. After noticing this, I tested this on several paths and files and it was always the same. Why does piping dd through gzip also increase the transfer rates by a large factor instead of only reducing the bytelength of the stream by a large factor? I'd expected even a small decrease in transfer rates instead, due to the higher CPU consumption while compressing, but now I get a double plus. Not that I'm not happy, but just wondering. ;)

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• How do I create a postgresql user and database from a fresh install?

  - by josephturian

  I just installed postgresql onto an ubuntu box. How can I create user foo with password bar and database baz, so that foo owns baz? foo is not a unix user.

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• AHCI on Windows if BIOS does not have the option but all hardware does support it?

  - by Foo Bar

  Is it somehow possible to use AHCI on Windows if the BIOS does not have the option to enable it? This is a known problem especially on mid-old Laptops that have chipsets and drives that perfectly support SATA and AHCI, but only provide the legacy IDE mode in BIOS. Especially with SSD's this can often be a problem. I know that Linux has no problems to run everything in SATA and AHCI mode on these machines. So, is there any possibility to also make Windows "override" the BIOS? Some kind of alternative BIOS's, drivers, etc? Or some kind of Linux-based boot module that emulates an AHCI-capable BIOS to Windows while booting up?

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• MySQL Cluster transaction isolation level - READ_COMMITTED

  - by Doori Bar

  I'm learning by mostly reading the documentation. Unfortunately, http://dev.mysql.com/doc/refman/5.1/en/set-transaction.html#isolevel_read-committed doesn't say anything, while it says everything. Confused? Me too. ndb engine supports only "READ_COMMITTED" transaction isolation level. A. It starts by saying "sets and reads its own fresh snapshot", which I translate to: The transaction is having a separated 'zone' which whatever it stores there - is what it reads back. B. While out-side of the transaction, the old-values are unlocked. C. It continues with: "for locking reads" sentence - No idea what it means. Question: they claim only READ_COMMITTED transaction isolation level is supported, but while handling a BLOB or a TEXT, they say the isolation is now "locked for reading" too. So is it a contradiction? can a transaction LOCK for reading just as well while handling something other than BLOB/TEXT? (such as integers)

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• Regex for url domain

  - by systempuntoout

  How do i match from these urls: http://foo.bar.com http://bar.com foo.bar from the first link and bar from the second link using one single regex?

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• recursive typedef

  - by FredOverflow

  Is the following allowed? typedef Foo<Bar> Bar; My compiler complains that 'class Bar' has a previous declaration as 'class Bar'.

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• In DNS can an IN NS point to a CNAME?

  - by embobo

  Is it allowed to have an NS record be a CNAME? E.g.: subdomain.example.com. IN NS ns1.example.com. ns1.example.com. CNAME foo.example.com. foo.example.com. IN A 10.1.1.1 This doesn't seem to work in bind though this (of course) does: subdomain.example.com. IN NS foo.example.com. foo.example.com. IN A 10.1.1.1 Any pointers to RFCs prohibiting this setup would be appreciated.

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• Can a DNS server return NXDOMAIN and an unresolved CNAME even though the alias exists?

  - by Martin

  I'm trying to understand why one given DNS server is not resolving our domain correctly. When I look up www.foo.com from this name server, a CNAME foo.bar.cc is correctly returned but there's no attached A record and the response status is NXDOMAIN. I understand that this could happen if the DNS server can not resolve the alias foo.bar.cc. However, if I use the same DNS server and look up foo.bar.cc directly, I always get the correct A record. When using any other DNS servers I've tested (different ISPs, Google DNS, Open DNS) our domain resolves correctly. Given this situation, is there some possible problem in our DNS that could cause this? Or does it seem like this given DNS server is to blame? The DNS server in question is used by a lot of people and it seems more likely that the problem is caused by us, but I don't see how - any clues?

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• Excel - Dynamic row reference based on the row I paste a formula into?

  - by michaelmichael

  I have a simple, oft-used formula that I paste as plain text into spreadsheets I receive. It looks something like this: =IF(D8="FOO", "BAR", "BAZ") It looks in D8 for the word "FOO". If it finds it it will show "BAR". If it doesn't it will show "BAZ" It works great. The problem is I have to paste this formula as plain text into many spreadsheets. It should ALWAYS look in column D for "FOO", however I don't always want it to look in row 8. I'd like it to look at whatever row I'm pasting it into. For example, if I pasted the above formula into row 25, say, I would like it to automatically change to this: =IF(D25="FOO", "BAR", "BAZ") Is there any way to achieve this?

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• mod_rewrite only one extension

  - by Matthias Reisner

  Currently I'm having the following htaccess content: <IfModule mod_rewrite.c> RewriteEngine on RewriteRule ^(.*).html$ $1.php </IfModule> I want to change the php extension to html. Now if I browse for localhost/xx.html I get the right content. BUT I also can use xx.php or xx to access the oontent! I only want to get the content if there is an html extension! How can I make this work??? Example: On the server I have the file foo.php. Now I want the user to type in foo.html in the browser to get the content of foo.php. But if he types foo.php there will be an error. I already tried this RewriteRule ^(.*)[^\.html]$ error.php RewriteRule ^(.*)\.html$ $1.php But that does not really work Thanks!

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• URI Rewrite with fake subdomains and multiple variables

  - by Rich

  Can someone please help with trying to use mod rewrite so foo.domain.com is rewritten to domain.com/p.php?s=foo and foo.domain.com/bar to domain.com/p.php?s=foo&p=bar? Currently my .htaccess is: RewriteEngine On # Remove www RewriteCond %{HTTP_HOST} ^www.domain.com$ [NC] RewriteRule ^(.*)$ http://domain.com/$1 [R=301,L] # Rewrite subdomain etc. RewriteCond %{HTTP_HOST} ^(.*)\.domain\.com$ [NC] RewriteRule ^([^/]+)/?$ p.php?s=%1&p=$2 [QSA,L,NC] But I can't work out how to grab the second variable (being optional and after a slash at the end of the URI. I've tried changing the end of the condition to ?/(.*)$, but to no avail and my mod rewrite skills are certainly naff!

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• ProxyPass for specific vhost

  - by Steve Robbins

  I have a web server that it set up to dynamically server different document roots for different domains <VirtualHost *:80> <IfModule mod_rewrite.c> # Stage sites :: www.[document root].server.company.com => /home/www/[document root] RewriteCond %{HTTP_HOST} ^www\.[^.]+\.server\.company\.com$ RewriteRule ^(.+) %{HTTP_HOST}$1 [C] RewriteRule ^www\.([^.]+)\.server\.company\.com(.*) /home/www/$1/$2 [L] </IfModule> </VirtualHost> This makes it so that www.foo.server.company.com will serve the document root of server.company.com:/home/www/foo/ For one of these sites, I need to add a ProxyPass, but I only want it to be applied to that one site. I tried something like <VirtualHost *:80> <Directory /home/www/foo> UseCanonicalName Off ProxyPreserveHost On ProxyRequests Off ProxyPass /services http://www-test.foo.com/services ProxyPassReverse /services http://www-test.foo.com/services </Directory> </VirtualHost> But then I get these errors ProxyPreserveHost not allowed here ProxyPass|ProxyPassMatch can not have a path when defined in a location. How can I set up a ProxyPass for a single virtual host?

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• Server specification recommendation

  - by foo

  To cut the story short, I can't buy an item (server/cpu/motherboard/ram) that costs more than USD 330. However, I can combine them, meaning, I can buy a CPU that costs USD 330 and motherboard that costs USD 330. With this limitation, I can't buy a powerful 1U server which will definitely costs me more USD 330. With that in mind, I was hoping to build a powerful desktop PC which will be used as a database server. However, through my experience, desktop PC doesn't last very long, usually the motherboard will just die by itself after 1 or 2 years. So, what would you guys recommend me to buy with this kind of budget? Every item must be <= USD 330. Will be used as a MySQL server. RAID would be nice. 1TB is pretty big for my data. I do not need external graphic card (onboard would do just fine), mouse, keyboard, monitor. Linux friendly. One ethernet port is good enough. It's important that those hardware is made of components that will last long (at least 3 years or something). The server will be placed in an air conditioned room, but a good ventilation for the server is always preferred. I won't overclock it. Intel processor is preferred. Thanks in advance.

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• Does searching a keyword on Google make the crawlers look harder in the future?

  - by Foo Bar

  Do the search requests made by the users influence the Google crawlers "attraction" by this keyword? Let's say Google has some hits on a specific keyword in the search index. And now I search for exactly this keyword. Will the Google crawlers react to the search and keep looking more intense for pages that could match this keyword? A reason why this could be important: Privacy when searching yourself. Assume you just want to know how much Google (and thus other people) can find out about you. If now any (statistical) additional search for your name trigger the crawlers even one step harder to find even more about you, it would have the negative effect that you would actually be found easier in the future, even though you had the intention and hope to find out how few Google finds about you. It's a bit like the dillema in quantum mechanis: Does observing the system automatically change the system?

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• How to get attributes from parent?

  - by bribon

  Hi all, Let's say we have these classes: class Foo(object): _bar = "" def __init__(self): self.bar = "hello" def getBar(self): return self._bar def setBar(self, bar): self._bar = bar def getAttributes(self): for attr in self.__dict__: print attr bar = property(getBar, setBar) class Child(Foo): def __init__(self): super(Child, self).__init__() self.a = "" self.b = "" if I do something like: child = Child() child.getAttributes() I get all the attributes from parent and child. How could I get the attributes only from the parent? Thanks in advance!

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• htaccess rewriting all subdomains to subdirectories

  - by indorock

  I'm trying to build a catch-all for any subdomains (not captured by previous rewrite rules) for a certain domain, and serve a website from a subdirectory that resides in the same folder as the .htaccess file. I already have my vhosts.conf to send all unmapped requests to a "playground" folder, where I want to easily create new subdomains by simply adding a subfolder. So, my structure looks like this: /var/www/playground |-> /foo |-> /bar The .htacces living inside the /playground folder and /foo and /bar being seperate websites. I want http://foo.domain.com to point to /foo and http://bar.domain.com to /bar. Here is my .htaccess file: RewriteEngine On RewriteCond %{HTTP_HOST} ^([^.]+).domain.com$ [NC] RewriteCond %{REQUEST_URI} !^/%1/(.*) RewriteRule ^(.*) /%1/$1 [L] This is supposed to capture the subdomain, add it as a subfolder in RewriteRule, then append after the slash and path information. The second RewriteCond is there to prevent an infinite loop. My idea was that %1 in the second RewriteCond would be able to capture the capture group in the first RewriteCond. But so far I haven't had any success, it's always ending up in a redirect loop. If I would replace %1 in the second RewriteCond with hardcoded 'foo' or 'bar', it works, which leads me to believe that you cannot refer to a capture group inside a RewriteCond. Is is true? Or am I missing something?

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• Rewrite 2 different directories with htaccess?

  - by jason

  I have a tricky problem (for me at least). I'm trying to rewrite / to a folder /webroot/www. I have some simple code and it works: RewriteRule ^$ /webroot/www/ [L] However at the same time if the URL starts with components, followed by anything else (ex. foo, as in /components/foo), and foo is an actual directory that exists inside components, I should rewrite to /components/foo/www instead. How can I achieve that? I can't seem to figure it out. I'm using Apache with .htaccess.

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• Better way to do "echo $x | sed ..." and "echo $x | grep ..."

  - by DevSolar

  I often find this in scripts (and, I have to admit, write it myself): a=`echo $x | sed "s/foo/bar/"` or if echo $x | grep foo then ... fi Consider "foo" to include some regex stuff. I feel that there should be - and most likely is - a better way to phrase this, one that does not involve two commands and a pipe but wraps the thing into some more compact expression. I just can't find it. Anybody?

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• Alias one set of Subdomains to another

  - by Schneems

  I have to domains that I want to effectively mirror one another on select subdomains. Let's say they are pirates.com and ninjas.com and i want ninjas to mirror the content on pirates. When I visit foo.ninjas.com I want to see the content on foo.pirates.com. Due to app restrictions I need to do this in DNS for an undefined number of subdomains. I was under the impression i could do this with a CNAME, but it appears that setting a CNAME for * subdomain of the ninjas.com domain to point to pirates.com will make any subdomain of ninjas.com point at pirates.com instead of the associated subdomain. I.e. foo.ninjas.com would reference pirates.com instead of foo.pirates.com. Is there a way to do this using DNS? Am I missing something basic?

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• [R] select values from list using Date as index

  - by Pieter

  Suppose I have a list as follows bar=c() bar["1997-10-14"]=1 bar["2001-10-14"]=2 bar["2007-10-14"]=1 How can I select from this list all values for which the index is within a specific date range? So, if I look for all values between "1995-01-01" and "2000-06-01", I should get 1. And similarly for the period "2001-09-01" and "2007-11-04", I should get 2 an 1.

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• saving the results of the time command while discarding the results of the command being timed (unix

  - by John Kube

  I'm timing how long it takes to run a command foo. I'm looking to append the results from the time command to a file, and discard the results from the foo command. I tried the following, but it didn't do what I want: $ time ./foo > /dev/null >> output_from_time_command.txt Any suggestions? Thanks!

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• remove the content in directory and subdirectory hierarichally with out distroy the directory structure

  - by user3713876

  In shell script, I want to clear only text files and log files in the following structure with out removing the directory as well as subdirectories | |------bar/ | |---file1.txt |---file2.txt | |---subdir1/ | |---file1.log | |---file2.log | |---subdir2/ |---image1.log |---image2.log I am using rm -rf /bar/* so I am getting the result as follows. |------bar/ but I want the output like following | |------bar/ | | | | |---subdir1/ | | | |---subdir2/ I want to remove only text files or log files or csv with out removing the directory and the subdirectories

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• NCurses, scrolling of multiline items, "current item" pointer and "selected items"

  - by mjf

  I am looking for hints/ideas for the best (most effective) way on how to scroll multi-line items as well as emphasizing of the "current item" and "selected items" such as: 1 FOO ITEM 1 Foo sub-item 2 Foo sub-item 3 Foo sub-item 2 BAR ITEM 1 Bar sub-item 3 BAZ ITEM 1 Baz sub-item 2 Baz sub-item 4 RAB ITEM 5 ZZZ ITEM 1 Zzz sub-item 2 Zzz sub-item 3 Zzz sub-item 4 Zzz sub-item using NCurses (some combination of windows, sub-windows, pads, copywin? Uff! In fact, the lines could exceed the stdscr's width so that possibility to scroll left/right would be also nice - pads?)... The whole items (including the sub-items) are supposed to be emphasized as full-width window/pad areas. The "current item" (including it's set of lines) should be emphasized (i.e. using A_BOLD), selected set of items of choice (including the set of lines for each the selected item) should be emphasized in another way (i.e. using A_REVERSE). What would you choose to cope with it the most effective NCurses way? (The less redrawals/refreshes the better and terminal is supposed to have the ability to change it's size - such as XTerm running under "floating window" management.) Thank you for your ideas (or perhaps some piece of code where something similar is already solved - I was not able to find anything helpful on the Internet. I mean I am not going to copy/paste foreign code but programming NCurses properly is still somehow difficult to me). P.S.: Would you suggest to "smooth-scroll" +1/-1 screen line or rather "jump-scroll" +lines/-lines of the items? (I personally prefer the latter one.) Sincerely, -- mjf

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