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How can I get multiple stacked plots (ybar stacked, stack plots=y) in one diagram, such that there are multiple stacked bars for the same x-coordinate, each slightly shifted? Is there a way to reset pgfplot's zero levels after an \addplot command, such that the next \addplot[xhshift=...] doesn't add something to the current stack, but rather starts a fresh stack?  FWIW, overlaying two plots with scale only axis won't help; I need this to work with groupplot I took this code straight out of 'Java all in one for Dummies' ....why doesn't it work? What's the downtime limit of a domain controller (DC)? On my VMware  environment there are 10 VMs running. One of the VMs is the domain controller (). The other VMs are configured with a static DHCP and DNS IP address in their network settings.  How long is the downtime limit of my domain controller? How can an int be cast to an enum in C#? markdown doesn't work properly I've written a few questions on Stack Overflow before that have been closed due to being "not constructive" or "not a real question".  Now, after scanning the FAQ for the site a few times, I understand that my questions were indeed closed for good reason.  However, even after reading the FAQ, I still don't understand why a question of "what's the best practice here?" is a bad thing.  I feel as though if you properly explain your situation as thoroughly as possible, then it shouldn't be a bad question at all.  Questions like "what's the best language?" or "which framework should I use?" are indeed bad questions initially, but I feel if you specify in the post (or preferably in the title itself) what the context is, shouldn't that be deserving of some kind of an answer?  In  I asked what would be "best practice", and naturally my question was closed.  So I read the FAQ and learned how to make a more constructive question, of which I've now re-edited in an attempt to be less vague.  I understand the desire to avoid debate and lengthy discussion over a question, but I also feel as though sometimes there are certain questions which should be asked if proper context is given.  Why is a question over "best practice" always a bad question to ask? Here are some examples.  "Until the Son of God appear" What I was taught: Subjunctive of indefinite future.  "It is required that the applicant be 18 years old and possess a valid driver's license." What I was taught: mandative subjunctive.  "Where be ye going," said the false knight on the road?" What I was taught: subjunctive of direct discourse.  "If I were you, which we both are thankful I am not, I wouldn't do that. What I was taught: The subjunctive mood is used for supposition contrary to fact.  "I dreamed I were a fireman in my Maidenform bra." What I was taught: The subjunctive mood can be used with words like dream.  "God bless you." I don't remember, so obviously I wasn't taught.  I can live with Pluto's not being a planet, but I must say it's irksome to find that so much of what I was told about English turns out to be nonsense. How can you programmatically tell an HTML SELECT to drop down (for example, due to mouseover)? One thing that seems to be missing in the Top&nbsp;Bar is a link to the Stack&nbsp;Exchange portal. It only displays under the "Current&nbsp;Community" section when you are in the community, but it disappears as soon as you go to another one.  Would it be possible to add a link that would always be there no matter which community you are currently on? Can I be automatically notified of prolonged blocking in SQL server? About once a week I have to resolve a blocking chain on a SQL Server 2005 database, caused by a long-lived read lock from an Access 2003 front-end. The lock is taken out whenever a user opens a certain form and is released once the user has finished scrolling through the form or closes it. Since many of our users open this form as reference, these locks stay around for a while. Any update to the table causes the blocking, and suddenly nobody can select from this table since they're all waiting on the first lock. This is quite a problem for us, since lots of apps rely on this data. I understand that this locking behavior is part of how Access works with linked tables.  I've been solving the problem from Activity Monitor,  whenever I find out about it. This is a problem not only because it takes me time to do it manually, but also because it's reactive. By the time I hear about it, it's already been a problem for a lot of people.  I'd like to know if there is an automatic way to check for these long-lasting blocking chains, and either be emailed or have the problem resolved automatically. The logic seems straightforward enough ("if any process matching this SELECT query has been blocking for longer than a minute, notify me/kill it") but I don't know how to implement this with SQL Server.  For what it's worth, I think the proper solution is to fix or rewrite the app. However, due to departmental politics, this is not an option for the next few months, so I'm looking for a stopgap. Scanning Java annotations at runtime Using Ubuntu 11.10, how do I format an external or USB drive? I don't find an option to 'format' when I right click. In the new version, the drives don't come up on the desktop, but instead come on the Launcher. How to insert an item into an array at a specific index (JavaScript)? I am looking for a JavaScript array insert method, in the style of:  arr.insert(index, item)   Preferably in jQuery, but any JavaScript implementation will do at this point. Why I cannot ping 192.168.0.108 (my computer IP?) Ipconfig says that my IP is 192.168.0.108 C:\Users\vbcbu&gt;Reply from 192.168.0.108: Destination host unreachable.ip 'Reply' is not recognized as an internal or external command, operable program or batch file.  C:\Users\vbcbu&gt;ipconfig  Windows IP Configuration   Ethernet adapter Ethernet:     Media State . . . . . . . . . . . : Media disconnected    Connection-specific DNS Suffix  . :  Wireless LAN adapter Local Area Connection* 12:     Media State . . . . . . . . . . . : Media disconnected    Connection-specific DNS Suffix  . :  Wireless LAN adapter Local Area Connection* 13:     Media State . . . . . . . . . . . : Media disconnected    Connection-specific DNS Suffix  . :  Wireless LAN adapter Wi-Fi 2:     Connection-specific DNS Suffix  . : www.tendawifi.com    Link-local IPv6 Address . . . . . : fe80::3804:2d04:a591:7142%6    IPv4 Address. . . . . . . . . . . : 192.168.0.108    Subnet Mask . . . . . . . . . . . : 255.255.255.0    Default Gateway . . . . . . . . . : 192.168.0.1  Ethernet adapter Bluetooth Network Connection:     Media State . . . . . . . . . . . : Media disconnected    Connection-specific DNS Suffix  . :  C:\Users\vbcbu&gt;  I can ping router at 192.168.0.1 I can't ping 192.168.0.108 C:\Users\vbcbu&gt;ping 192.168.0.1  Pinging 192.168.0.1 with 32 bytes of data: Reply from 192.168.0.1: bytes=32 time=2ms TTL=64 Reply from 192.168.0.1: bytes=32 time=24ms TTL=64  Ping statistics for 192.168.0.1:     Packets: Sent = 2, Received = 2, Lost = 0 (0% loss), Approximate round trip times in milli-seconds:     Minimum = 2ms, Maximum = 24ms, Average = 13ms Control-C ^C C:\Users\vbcbu&gt;ping 192.168.0.8  Pinging 192.168.0.8 with 32 bytes of data: Reply from 192.168.0.108: Destination host unreachable. Reply from 192.168.0.108: Destination host unreachable. Reply from 192.168.0.108: Destination host unreachable. Reply from 192.168.0.108: Destination host unreachable.  Ping statistics for 192.168.0.8:     Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),  C:\Users\vbcbu&gt;ping 192.168.0.8  Pinging 192.168.0.8 with 32 bytes of data: Reply from 192.168.0.108: Destination host unreachable. Reply from 192.168.0.108: Destination host unreachable. How can I change the margins for only part of the text? Sometimes the margins need to be changed for a particular page, paragraph, or other section of text.  For example, if I'm writing a letter and want the left margin to be almost at the right side of the page for the four lines of my address, or if I am combining prose with poetry and want the poems to be indented relative to the rest of the work.  What is the best way to change both left and right margins on the fly? iOS 9 Screen Recording in El Capitan I used to record iOS devices through QuickTime, however now it's only recording audio (not sure is this linked to OS X 10.11 or iOS 9).  How can I fix this (without third party sofrware)? Execute a large SQL script (with GO commands) How good is it for SEO if you have a widget that lives on other sites? I made a widget that would ideally live on other sites.  Here is an example:   I guess since the widget would link back to me, it would be an SEO boost for my site.  Is that correct?  Or would it be just an SEO boost for that particular URL?  If it is just an SEO boost for the particular URL, it does me little good since that page does not link to any of my other pages.  Am I thinking about this correctly?  How are these things typically handled so that there is  a benefit to my site's SEO? How did Rita know she lost the power? I'm running a VPS of a german provider and want to switch from Ubuntu to CentOS. There I tried to install firewalld (was not preinstalled), but it always fails with the error  ERROR: Failed to load nf_conntrack module: modprobe: ERROR: could not find module by name='nf_conntrack' modprobe: ERROR: could not insert 'nf_conntrack': Function not implemented modprobe: ERROR: Error running install command for nf_conntrack modprobe: ERROR: could not insert 'nf_conntrack': Operation not permitted   Obviously the nf_conntrack kernel module was not found. Since this is a VPS, I cannot tinker with the kernel modules. On the support site of my provider I found a list of available kernel modules, for example:  ip_conntrack_netbios_ns ipt_conntrack    ip_conntrack    ip_conntrack_ftp    ip_conntrack_irc   Since nf_conntrack is not listed here, does that mean, that I cannot use firewalld? Is it possible to run it without this module?  I guess I could use iptables, if I wanted to (it seems to run correctly). But as I have more experience with firewalld, I would like to stick with it.    CentOS Linux release 7.7.1908 (Core)  uname -a: Linux xxxxxx.xxxxxxxx.xxx 3.10.0-042stab140.1 #1 SMP Thu Aug 15 13:32:22 MSK 2019 x86_64 x86_64 x86_64 GNU/Linux