My android was working fine until one day, i saw     Error retrieving information from server. [DF-DFERH-01]   with a RETRY button.  This is happening only in the "My wishlist" menu. No errors before.  I have ZTE Blade III with android 4.0.4 Ice Cream Sandwich.  SCREENSHOT:
I have a Storex eZee Tab 702 tablet. My Google Play Store was working very well until a few weeks ago, when it started saying,     Error while retrieving information from server [DF-DFERH-01]   I tried to clear the cache, clear the data, force stop, and downloading another Google Play Store, but I'm still having the same problem.  How can I fix this issue?
How can I write the name show in axis of 3D array using TiKz I am drawing a 3D array like the attached picture, which actually describes a multidimensional array. However, I can not put the name of the axis and take the value from the matrix like the attached picture.  This is the code that I have:  \documentclass[margin=5mm]{standalone} \usepackage{tikz} \usetikzlibrary{matrix,calc}  \begin{document} \begin{tikzpicture}[every node/.style={anchor=north east,fill=white,minimum width=1.4cm,minimum height=7mm}] \matrix (mA) [draw,matrix of math nodes] { (1,1,3) &amp; (1,1,3) &amp; (1,1,3) &amp; (1,1,3) \\ (1,1,3) &amp; (1,1,3) &amp; (1,1,3) &amp; (1,1,3) \\ (1,1,3) &amp; (1,1,3) &amp; (1,1,3) &amp; (1,1,3) \\ (1,1,3) &amp; (1,1,3) &amp; (1,1,3) &amp; (1,1,3) \\ };  \matrix (mB) [draw,matrix of math nodes] at ($(mA.south west)+(1.5,0.7)$) { (1,1,3) &amp; (1,1,3) &amp; (1,1,3) &amp; (1,1,3) \\ (1,1,3) &amp; (1,1,3) &amp; (1,1,3) &amp; (1,1,3) \\ (1,1,3) &amp; (1,1,3) &amp; (1,1,3) &amp; (1,1,3) \\ (1,1,3) &amp; (1,1,3) &amp; (1,1,3) &amp; (1,1,3) \\ };  \matrix (mC) [draw,matrix of math nodes] at ($(mB.south west)+(1.5,0.7)$) { (1,1,3) &amp; (1,1,3) &amp; (1,1,3) &amp; (1,1,3) \\ (1,1,3) &amp; (1,1,3) &amp; (1,1,3) &amp; (1,1,3) \\ (1,1,3) &amp; (1,1,3) &amp; (1,1,3) &amp; (1,1,3) \\ (1,1,3) &amp; (1,1,3) &amp; (1,1,3) &amp; (1,1,3) \\ };  \draw[dashed](mA.north east)--(mC.north east); \draw[dashed](mA.north west)--(mC.north west); \draw[dashed](mA.south east)--(mC.south east); \end{tikzpicture}   \end{document} Weird http -> https redirection although not configured I am running Apache 2.2.15 (CentOS 6.6) with a HTTP-only domain   demo.xml-director.info  Using wget I can retrieve the content properly   wget -S http://demo.xml-director.info --2015-01-05 13:31:41--  http://demo.xml-director.info/ Resolving demo.xml-director.info (demo.xml-director.info)... 176.9.146.28 Connecting to demo.xml-director.info (demo.xml-director.info)|176.9.146.28|:80... connected. HTTP request sent, awaiting response...    HTTP/1.1 200 OK   Date: Mon, 05 Jan 2015 12:31:41 GMT   Server: Zope/(2.13.22, python 2.7.6, linux2) ZServer/1.1   Content-Length: 20227   Expires: Sat, 01 Jan 2000 00:00:00 GMT   Content-Type: text/html;charset=utf-8   X-Ua-Compatible: IE=edge,chrome=1   Content-Language: en   Vary: Accept-Encoding   Keep-Alive: timeout=15, max=100   Connection: Keep-Alive Length: 20227 (20K) [text/html] Saving to: 'index.html.4'   However Chrome/Firefox always change the request from http to https because of HTST. However for this particular domain there is no HSTS configured.  The server runs SSL for www.xml-director.info with enabled HSTS support. However there is further alias here that would map demo.xml-director.info to www.xml-director.info.   How can this problem be resolved.  VHOst for www.xml-director.info:  &lt;VirtualHost *:443&gt;     ServerName www.xml-director.info     ServerAlias xml-director.info      SSLEngine on     SSLCertificateFile /etc/httpd/certs/15742445repl_2.crt     SSLCertificateCHainFile /etc/httpd/certs/15742445repl_2.ca-bundle     SSLCertificateKeyFile /etc/httpd/certs/zopyx.com.key      CustomLog /var/log/httpd/xml-director.info.log combined     DocumentRoot /var/www/xml-director/landing-v1      Header always set Strict-Transport-Security "max-age=63072000; includeSubDomains"      &lt;location "/"&gt;         Options +Indexes         Header set Access-Control-Allow-Origin "*"         Header set Access-Control-Allow-Methods "GET,PUT,POST,DELETE"     Header set Access-Control-Allow-Headers "X-Requested-With,Content-Type"     &lt;/location&gt;  &lt;/VirtualHost&gt;  &lt;VirtualHost *:80&gt;     ServerAlias www.xml-director.com      ServerAlias www.xml-director.info     ServerAlias www.xml-director.de     ServerAlias xml-director.com     ServerAlias xml-director.info     ServerAlias xml-director.de      RedirectPermanent / https://xml-director.info/ &lt;/VirtualHost&gt;   and for demo.xml-director.info  &lt;VirtualHost *:80&gt;     ServerName  demo.xml-director.info     RewriteEngine On      RewriteRule ^/(.*) http://127.0.0.1:12020/VirtualHostBase/http/demo.xml-director.info:80/xml-director/VirtualHostRoot/$1 [L,P]     RewriteRule ^/$    http://127.0.0.1:12020/VirtualHostBase/http/demo.xml-director.info:80/xml-director/VirtualHostRoot/$1 [L,P]      CustomLog /var/log/httpd/demo.xml-director.info.log combined     AddOutputFilterByType DEFLATE text/html text/xml text/plain text/css text/javascript      CacheRoot /tmp/cache     CacheEnable disk /     CacheIgnoreCacheControl on      KeepAliveTimeout 15     KeepAlive on      ExpiresActive On     ExpiresByType image/gif "access plus 10 day"     ExpiresByType image/jpg "access plus 10 day"     ExpiresByType image/jpeg "access plus 10 day"     ExpiresByType image/png "access plus 10 day"     ExpiresByType text/javascript "access plus 10 day"     ExpiresByType text/html  "access plus 1 hour"     ExpiresByType text/html  "access plus 1 hour"     ExpiresByType text/css  "access plus 10 days"      &lt;Location "/"&gt;         Order allow,deny         Allow from all     &lt;/Location&gt;  &lt;/VirtualHost&gt; Find the minimum value of $f(x,y,z)=\frac{x^2}{(x+y)(x+z)}+\frac{y^2}{(y+z)(y+x)}+\frac{z^2}{(z+x)(z+y)}$. Find the minimum value of $f(x,y,z)=\frac{x^2}{(x+y)(x+z)}+\frac{y^2}{(y+z)(y+x)}+\frac{z^2}{(z+x)(z+y)}$ for all notnegative value of $x,y,z$.  I think that minimum value is $\frac{3}{4}$ when $x=y=z$ but I have no prove. Having trouble adding objects to NSMutableArray in Objective C What do I do? I looked at a similar question to mine and there was an answer saying to make sure Java is allowed past the firewall. So I checked and it already is. I've tried uninstalling and installing both Minecraft and Java but nothing has changed.  says that all services are fine, so what's going on? I bought a 2nd account to use as an alternative in-game account and now I can't log in.  (I cleared the email and password boxes for obvious reasons in this screenshot: security purposes) Will Google punish me if I import a story from my own blog to content sharing sites such as Medium.com? I've heard that Google punishes sites with duplicate content.   If I write an article on my blog then import it on Medium (basically a copy/paste) will Google regard it as a duplicate?   Medium.com is a blog platform (sort of). How to calculate the resistance of a complicated circuit? I learned in high school the basic rules of how to compute resistance between two points, given a network of resistors.  You try to rearrange the circuit so into parallel parts and series parts, then compute the resistance of each piece individually using those rules, until you're left with just one number, and you're done.  Maybe I explained that poorly, so consider the following schematic:         &ndash; Schematic created using   Sorry it's so large, that seems to be the default.  Anyway, it's easy to compute the resistance from A to D (regardless of the values of the all the resistors)- A-B-D, A-D, and A-C-D are all series connections (easy to compute) then you combine them with the parallel formula and you're set.  But!  How do you compute the resistance from B to C?  There seem like lots of possible ways to think about it, and they all generate different answers.  I've left the specific numbers off the diagram because this isn't homework and I don't care about the answer specifically, I just want to understand the principles involved and how to solve the problem.  Any help, or links to especially readable guides, would be very much appreciated. What is the best technique to calculate a confidence interval of a binomial experiment, if your estimate is that $p=0$ (or similarly $p=1$) and sample size is relatively small, for example $n=25$? Graphical interface for generating presentation slides Is there a good graphical interface, similar to PowerPoint or LibreOffice Impress, for generating presentation slides?  When writing documents I prefer to write my text and LaTeX-markups using a text-editor and not using a graphical tool like LyX. However, in the case of presentation slides I want to see the layout and to have the ability to immediately see what you get e.g. by moving a picture with arrow keys.  ADDITION: The background to my question is as follows. I have used PowerPoint for more than a decade and like to use a WYSIWYG tool when making presentation slides. However, I can not use PowerPoint on my current computer and I think the output from LibreOffice Impress is inferior. As a long-time user of LaTeX, I have considered using SliTeX or Beamer but unfortunately I do not like the way of working. The end result is of course superior, but I found it very time-consuming and tiresome to e.g. adjust the position and size of pictures. So I noticed that many cards with tap-effects ship with a clause specifying that they can only be used on untapped permanents, such as  and .  So here's my question:   Doesn't that imply that, given the right situation, one can legally tap an already tapped permanent?   I'll give an example of the kinda scenarios this is relevant for: Can  activate her first ability when no untapped cards are around? Or, thinking untap-effects, could I bounce a forest with  even when there isn't a tapped creature available?  Notice that, unlike the previous batch of examples, the wording on these lacks the clause restricting their use to un/tapped permanents - does that mean that they aren't?  Any kind of clarification would be greatly appreciated here. warning message at command line `sudo` Everytime I try to sudo something at the terminal, I get a warning message:  alexandre@XPS-15Z $ sudo mount file.iso /mnt/ -o loop [sudo] password for alexandre:  no talloc stackframe at ../source3/param/loadparm.c:4864, leaking memory   It's just annoying to get that all the time. How do I solve that? I'm on Ubuntu 14.04 (upgraded from 13.10) Is it acceptable to publish a paper using an affiliation with a former employer? Recently I've changed jobs, and consequently the field of research has also changed. But I'm still getting proposals for publications in the previous field, and it is interesting for me to accept some of them. My concern is about which affiliation to use: on one hand I gain all the knowledge in that field while working on the previous employer, also I hope they can cover my expenses related to the publication. On the other hand, I do not work for them anymore, and my current company has very little interest in my old field of research, and probably will not support it financially, but I think it is wise to mention them as well. As a compromise I'm thinking to put the previous employer in the affiliation, and the name of my new employer in the footnote, something like "currently at XYZ". Surely I'll discuss this issue with both, although the opinion of the community is also very valuable. I would like to know how can I customize the Ubuntu installer NOT customize Ubuntu, I just want to modify the installer.  We have a large environment here with lots of developers and since we don't use Windows, I want to customize the installer to automatically set the timezone to NYC, the keyboard layout to English USA, put the company logo in the installer etc... I Roll To Seduce The Dragon! (or, Do doublings of proficiency bonus stack?) Lets say there exist some enterprising young bard 3/ sorcerer 1 named Kirk.   Deciding to uphold (long past) family tradition, he has chosen to go out and have a little half-dragon of his own.   He chose Persuasion as his expertise skill, and is of a dragon bloodline himself, gaining the Dragon Ancestry perk.  Do they stack? Not the same ability, and both say "Your proficiency is doubled" when they activate. Granted, it would only happen when dealing with dragons. But there are certainly worse times to ramp up your charm. How to call gdal_translate from Python code? Is it possible to use some gdal API to call gdal_translate from Python code? I do not mean simply executing the gdal_translate.exe from the file system, but rather call it somehow in code so I do not need to know the exact directory the gdal_translate executable is in? How can we rewrite this optimization problem in standard form? Consider the following problem $$ \begin{array}{crl} &amp;\underset{y}{\max} &amp; f(y)\\ s.t. &amp; y_{1}A_{1}+y_{2}A_{2}+S_{1}&amp;=C_{1},\\  &amp; y_{3}A_{3}+y_{2}A_{4}+y_{5}A_{5}+S_{2}&amp;=C_{2},\\  &amp; y_{3}A_{6}+y_{4}A_{7}+S_{3}&amp;=C_{3},\\  &amp; S_{1},S_{2},S_{3}\succeq0, \end{array} $$ where $y_{i}$ are scalar variables and the matrices $A_{i}$ are symmetric real. How can we rewrite this optimzation problem in the following form  $$ \begin{array}{crl} &amp;\underset{y}{\max} &amp; f(y)\\ s.t. &amp; \sum_{i=1}^{m}y_{i}A_{i}+S&amp;=C,\\   &amp;S&amp;\succeq0, \end{array} $$ where $x_{i}$ are scalar variables and the matrices $B_{i}$ are symmetric real. please? Thanks. So in the first 5 or 6 books, it was very clear that the wand chooses the wizard and the power/level of the spells the wizard produces is based on the knowledge and skill of the wizard.  This is referenced by people constantly being telling Harry that he wasn't skilled enough to perform certain spells, or Bellatrix telling Harry that he needed to mean the Cruciatus curse for it to be effective.  However, in the 7th book, this entire idea is changed to the wand being the thing that's powerful and regardless of the wizard's/witch's skill or knowledge, he/she could still perform a very advanced spell if it's something the wand could handle.  Goyle accidentally creating a fire serpent is something that instantly comes to mind from the movies(I don't remember if that happened in the book).  So, my question is, what actually holds the power, the wizard/witch, or the wand? Alternative to Photoshop or Paint.NET I have been moving toward Ubuntu from a long time Windows development background. The one program I cannot seem to do without is a graphic editor. I have seen recommendations for programs, but they turn out to be directed at children or tailored to working with personal photographs.  I am looking for something more for programming tasks like analysing colors, resizing, creating web graphics, etc. I have used Photoshop in the past and more recently have mostly used Paint.net for Windows.  Is there a program for Ubuntu that covers this area? Can I boot memtest86+ if I'm using UEFI? My installer build "signs" a DLL using a Code Signing certificate during the build process.   I've noticed that if I try to build twice in succession, the second build fails because the DLL is already signed so signcode chokes. Obviously I can fix this by signing a copy of the DLL in the build, but the problem intrigued me:   Is it possible to "unsign" a DLL, and if not, why not...?