How do I get the Yongnuo YN560 III flash to work with a canon eos 4000d camera?
The external Flash is not showing up in the configuration Menu when using Pixel TF-321 hot shoe. Is this the wrong adapter for that camera, as there is no X connection? I want to trigger a studio flash via sync connection. Can you recommend me a working hot shoe? Thanks!
How to enable ssh root access on Ubuntu 14.04 I´d like to enable the ssh root access on Ubuntu 14.04. Editing the /etc/ssh_config (PermitRootLogin yes) didn't affect anything. How much of an $n$-dimensional manifold can we embed into $\mathbb{R}^n$? I observed some naive examples. Spheres, for example, when we cut out one point, can be embedded into $\mathbb{R}^n$. And if we cut out a measure zero set of a projective space, it can be embedded into the Euclidean space of the same dimension. So I wonder if all manifolds can be embedded into a same dimensional Euclidean space when we cut out a measure zero set? Can anyone prove it or disprove it by giving me some counterexamples? I need the cs_CZ.ISO8859-2 locale to exist on Ubuntu 12.04 so a specific unit test can pass. The test makes the following call:  std::locale("cs_CZ.ISO8859-2")   On my OS X Lion install, this locale does exist, so the call to std::locale should work:  $ locale -a | grep cs cs_CZ cs_CZ.ISO8859-2 cs_CZ.UTF-8 $   However, on my Ubuntu 12.04 install, there is only a UTF8 variant, and no ISO8859-2 version of the cs_CZ locale, despite having installed language-pack-cs:  $ dpkg -l | grep language-pack-cs ii  language-pack-cs                       1:12.04+20120417                        translation updates for language Czech ii  language-pack-cs-base                  1:12.04+20120417                        translations for language Czech $ locale -a | grep cs_ cs_CZ.utf8 $   The unit test fails on this machine. Running the unit test under strace shows that it really is looking for the ISO8859-2 variant and not finding it anywhere:  open("/usr/lib/locale/cs_CZ.ISO8859-2/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/usr/lib/locale/cs_CZ.iso88592/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/usr/lib/locale/cs_CZ/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/usr/lib/locale/cs.ISO8859-2/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/usr/lib/locale/cs.iso88592/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/usr/lib/locale/cs/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/usr/share/locale-langpack/cs_CZ.ISO8859-2/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/usr/share/locale-langpack/cs_CZ.iso88592/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/usr/share/locale-langpack/cs_CZ/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/usr/share/locale-langpack/cs.ISO8859-2/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/usr/share/locale-langpack/cs.iso88592/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/usr/share/locale-langpack/cs/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)   I know absolutely nothing about locales, i18n, etc. However, I would like to get this test passing, and changing the test is not an option. If anyone can offer any insight into how to make this locale exist on Ubuntu 12.04 I would appreciate it greatly. "Agree" vs. "concur" Restarting with new account on iOS/GameCenter I have some files with TikZ graphics that have suddenly changed appearance since I upgraded to PGF-2.10.  Here is a minimal example:  \documentclass{minimal} \usepackage{tikz} \begin{document} \pgfversion\par \begin{tikzpicture} \draw[blue] plot[domain=-1:1] (\x,{\x^2 + \x^3}); \draw[xshift=4cm,blue] plot[domain=-1:1] (\x,{(\x)^2 + (\x)^3}); \end{tikzpicture} \end{document}   In PGF 2.00 I had this:    while in 2.10 I have this:    The one on the left in PGF 2.10 looks like the graph of y=x^3 but could also be y=x^3 + x|x|.   This has been  on sourceforge and  on the pgf-users mailing list.  Although I haven't checked myself yet, the bug remains open and some of the commenters below report that problems still exist in the CVS version.   Geoffrey Jones notes the bug is in the 2.00 CVS version:     Hi Matthew, not an answer, just an FYI   that's too large for the comment box.   My compile of your code through pgf   v2.00 produces the result you see with   v2.10, above:       I.e., the difference you observe seems   to pre-date v2.10.   There is a workaround by inserting parentheses.  But since I have so many old lecture files I'd rather find a solution that doesn't involve rewriting my TikZ code.  And I'm squeamish about using the CVS bleeding edge code even if it were fixed, since I don't want to introduce other problems.  Ideally I'd like a simple patch that I can stick at the preamble, or just fix one file in the PGF distro. Where can I find a large palette / set of contrasting colors for coloring many datasets on a plot? I need large set (20 and more) of contrasted and easily visually-distinguishable colors for coloring different datasets on a scientific plot (the set of colors should not include white or black, and colors should be as bright as possible).   The plot is generated programmatically and intended to be included in a presentation which will be displayed using a projector.   Are there any ready-made sets of colors for such a task (I need colors as a set of RGB values)?   Or maybe there is some algorithm which generates such a set of colors programmatically (I use  for plot generation)?  P.S. The plot itself may look, for example, similar to this one: Do not give the impression that all votes are unanimously in favor of the winning close-reason. I closed for "belongs on superuser," yet SO claims I closed for a completely different reason.  Source: If matrix $A$ is unitary and $B^2=A$, is $B$ necessarily unitary? I am trying to connect my Galaxy Tab to the Internet through an ad-hoc network made via my PC. The PC ad-hoc settings are fine because I can use it from my iPhone and other devices. I wonder if there is somewhere an explanation for the parameters that can be set when running the Algorithm "Join Attributes by Location" in QGIS 2.18.  I had a look here:       but there is no explanation. Any hints? Does being refused entry to Singapore mean I am now blacklisted? My friend who is an Indonesian citizen tried to enter Singapore this week and was refused entry at the Singapore Harbour Front Ferry Terminal by immigration.  This was his first trip overseas and is not used to international travel, so due to his inexperience and that he was excited to go to Singapore, he possibly made some mistakes on trying to be granted access into Singapore.   He was told he was to enter a Singapore address for his stay or a friend or relative he will stay with. He was only staying for one day and was going to catch the ferry back at night, so he had no plan to stay in Singapore and as such had no address to put. They then asked why he was traveling alone and that he should travel with somebody for his first trip. He told them he always travels alone in Indonesia and finds it easier to see and do things alone. He was then asked why he was entering Singapore and the reason he gave was to purchase some electronics which he cannot buy in Indonesia. They asked for how much money he had and they then advised that he did not have enough money to purchase the items he was after. They refused his entry and he was then escorted to a ferry and returned to Indonesia. His passport was not stamped and he was not fingerprinted.   He was given a Notice of Refusal of Entry which had the reason as "Being ineligible for the issue of a pass under current immigration policies" form on his departure. Also included on this form is his passport number etc. He was not advised of him being banned or a time frame that he cannot enter Singapore.  My questions are: Has he been banned or restricted to enter Singapore for a period of time? When entering countries including Singapore, does he need to tick the box stating he has been refused entry into another country? I am hoping to get my friend to Australia at the end of the year for a 10 day holiday and will this hinder his chance of getting a visa and entering Australia? I hear a lot of people saying that neutrino is the lightest subatomic particle but according to me a photon must be the lightest as nothing can travel faster than light because it gets heavier and heavier and bends time. Can "whatever" be split into two words? I tend to write, "say whatever they want", but I'm always tempted to write "say what ever they want". Is it acceptable to split the word in this context? Just curious whether the process takes a while, and whether it scrapes through history to determine if it was once valid or not. Currently, I have 6 0-vote accepted answers and 20 1+-vote answers (), and that makes it > 5 and > 20% but not for long if voting goes up or down from here. ;-P  Update:  Special thanks to Grace Note for pointing out the  to follow. I upgraded this to a bug because it's been 48 hours during which the criteria supposedly were met. 6 0-votes, 20-23 1+ votes during the whole period. The criteria only last so long, so it may go out of scope soon. If it only checks every 3 days, I'm not sure if that's intentional or a bug. What is this lock screen with ads and how do I remove it? I think my device got a malware. A lock screen with ads sometimes appear, and I must swipe an area at the bottom of the screen to open the phone. I am in Eastern Europe, some ads are in Slavic languages, and they are seemingly related to travel.    Image resized. Click to view the full image  I have seen ads for Lot Air (Polish carrier). I recently went to their site.  Considering my recent surfing activity and the nature of the ads, I guess the malware is connected to airlines active in Eastern Europe.  The lock screen also promotes the app "DU Quick Charger" by claiming it has recharged the phone extra fast during screen off. (!?) It also shows battery level. I have never installed DU Quick Charger. I doubt DU Quick Charger is installed on the phone.  The problem started after installing Ryanair app. The problem is maybe, but not surely, related to this. Uninstalling Ryanair and restarting the phone doesn't remove the occasional appearance of this lock screen. After a while the situation has changed for the worse, now this lock screen appears after EVERY screen off.  I have always used Avast. I am not rooted and only install via Google Play.  What is this? And how do I remove it? How can I see the "implementation" of protected commands such as \LaTeX? After reading another question relating to how to see definitions of commands, I tried:  \documentclass{article} \begin{document} \show\LaTeX \end{document}   But this shows me in my logfile:  \LaTeX=macro: \protect \LaTeX   I just want to see where the \LaTeX command deep down somewhere finally says "OK, make the 'L' big, then make a little raised 'a,' then ..." How Do I Choose Between a Hash Table and a Trie (Prefix Tree)? So if I have to choose between a hash table or a prefix tree what are the discriminating factors that would lead me to choose one over the other. From my own naive point of view it seems as though using a trie has some extra overhead since it isn't stored as an array but that in terms of run time (assuming the longest key is the longest english word) it can be essentially O(1) (in relation to the upper bound). Maybe the longest english word is 50 characters?  Hash tables are instant look up once you get the index. Hashing the key to get the index however seems like it could easily take near 50 steps.  Can someone provide me a more experienced perspective on this? Thanks! Cannot successfully source .bashrc from a shell script Normally we can source ~/.bashrc file using this command  source ~/.bashrc   but if I write this in a shell script and execute it, nothing happens. Why? Is there any way to do this?  My script:  #!/bin/bash chmod a+x ~/.bashrc source ~/.bashrc   Also tried . (dot) instead of source. Same result. Preventing itemize environment to insert initial vertical space I'm using itemize and tables like the following  \begin{tabularx}{\textwidth}{&gt;{\ttfamily}llX}  \toprule  \textbf{\rmfamily Operator} &amp; \textbf{Typen} &amp; \textbf{Regel} \\  \midrule  = &amp; Alle Typen &amp;   \begin{itemize}    \item This is how we roll    \item Maybe we can talk?   \end{itemize} \\  \bottomrule \end{tabularx}   But it keeps inserting a vertical space before the itemized list. How can I prevent it from doing so?