This may be marked down at an astronomical rate - but here goes...  I find myself viewing UX stack exchange quite regularly on my iOS device, when on the go and thinking a downloadable app would be of benefit for 'widening the net' of users who want to access the forum ad-hoc from anywhere, thus increasing the chances of askers getting the very best answers in return, Transparent benefits would include faster access and a broader audience.  This is not opinion based, but more can see potential benefits fomr this being developed, thoughts welcome!
I like using Stack Overflow (or any other Stack Exchange sites) and was wondering if there was an app I could install on my phone or other device that would allow me to use the site on-the-go or straight from my desktop.  Some systems to consider:   Windows 8 Android iPhone/iOS   What are some apps that I could install to my computer or phone to enhance my Stack Exchange experience?
I am compiling LaTeX files with Texmaker on Ubuntu 12.04 system.   When I run pdflatex and then view the pdf file (internal), it does not show me the exact place where I am editing on Texmaker i.e. the generated pdf file does not show me the position of the cursor.   But some days before it was working fine. I don't know what causes this problem.  I already tried uninstalling and then reinstalling, I did update and upgrade too. But the problem still persists. How would I shift my whole set of equations/calculations at the left, to be aligned with "Example"?        \documentclass[11pt,a4paper]{report} \usepackage{amsmath,amsfonts,amssymb,amsthm,epsfig,epstopdf,titling,url,array} \usepackage{parskip}   \theoremstyle{plain} \newtheorem{thm}{Theorem}[chapter] % reset theorem numbering for each chapter \newtheorem{lem}[thm]{Lemma} \newtheorem{prop}[thm]{Proposition} \newtheorem*{cor}{Corollary}  \theoremstyle{definition} \newtheorem{defn}[thm]{Definition} % definition numbers are dependent on theorem numbers \newtheorem{exmp}[thm]{Example} % same for example numbers \newtheorem{conj}[thm]{Conjecture}  \theoremstyle{remark} \newtheorem*{rem}{Remark} \newtheorem*{note}{Note}   \title{My Thesis Title} \author{My Name} \date{\today} \renewcommand\labelenumi{(\theenumi)} \renewcommand\theenumi{\roman{enumi}} \setlength{\parindent}{1em}  \begin{document}  \chapter{Addition}  \begin{exmp}  Here is an example. \begin{align} \nonumber (a+b)^3 &amp;= (a+b)^2(a+b)\\ \nonumber &amp;=(a^2+2ab+b^2)(a+b)\\ \nonumber &amp;=(a^3+2a^2b+ab^2) + (a^2b+2ab^2+b^3)\\ \nonumber &amp;=a^3+3a^2b+3ab^2+b^3 \nonumber \end{align} \end{exmp} \end{document} Show that $a^n \mid b^n$ implies $a \mid b$ I've seen many boads with weird zig-zag shaped tracks just like the one below. Why are they designed like that? How long do black olives last once opened? I opened a can of sliced black olives for my pizza and only used half. I put the leftovers into a sealed container with the liquid and put it in the fridge. Under those conditions how long will the olives last? Is there a better way to store leftover olives? I have a computer with a video card that has no Linux support.  I discovered this issue while trying to use a persistent usb to boot from.   I found that I can boot like that if I change options and edit so as to add nomodeset there (see ).  Also, editing the syslinux.cfg file from my live persistent USB and adding nomodeset in a line there made this setting automatic for booting from the persistent USB.  Can I make a similar edit for proper install from the same live USB?  Is it possible to edit something on the live USB in order to install the SO from it,  -- that is: having automatically the nomodeset setting already there when the installation starts?  My problem is that in order to install I think I already have to have added nomodeset or I'll see nothing on my display. I need a way to be sure that nomodeset it's permanent from the start. This week I saw the definition of a measurable set for an outer measure.     Let $\mu^*$ be an outer measure on a set $X$. We call $A \subseteq X$ measurable if $$\mu^*(E) = \mu^*(A\cap E) + \mu^*(A^c\cap E)$$ for every $E \subseteq X$.   This is not the first time I've seen this definition. Unlike most other things in mathematics, over time I have gained absolutely no intuition as to why this is the definition.   The only explanation I've ever seen is that a set is measurable if it 'breaks up' other sets in the way you'd want. I don't really see why this is the motivation though. One reason I am not comfortable with it is that you require a measurable set to break up sets which, according to this definition, are non-measurable; why would you require that? Of course, you can't say what a non-measurable set is without first defining what it means to be measurable so I suppose no matter what your condition is, it will have to apply to all subsets of $X$.     Is there an intuitive way to think about the definition of measurable sets? Is there a good reason why we should use this definition, aside from "it works"? When your 10-year old boy says “It’s meta,” what does it mean? In what situation and of what sort of object they use this phrase? I asked about  a few days ago, quoting Maureen Dowd’s review of the movie, “J. Edgar” in New York Times.   I received six answers. But I still don’t get a clear idea of what “It’s meta” means because I don't understand (or have a total inability to comprehend) the concept of “self-referential.”   An answerer : “Meta in this fairly recent, casual context is supposed to mean self-referential, or recursive in some way. This is the sense in which my teenagers would use this term.”  So let me resubmit the question on “meta” in simpler format. When your teenager boy says “It’s (or this is) meta,” what does it mean? In what situation and of what sort of object they use this phrase?  I’m sorry for many users who lent me kind answers to my previous question. But I would like to get it fully on the meaning and usage of “it’s meta,” as a colloquial expression, not the meaning of meta as a prefix. Some applications simulate a virtual USB or CD Rom drive as if a USB drive is attached to the computer.  Is there any configuration or application that provides a virtual USB drive, not for the the operating system itself, but for other equipments which accept USB drive, through a USB port.  So I'll have a virtual hard disk (e.g. a *.vdi file) in the computer, which is connected, through a USB socket, as a USB drive to some other equipment (e.g. a cell phone or a laptop). Change date format [YYYYMMDD] to [MM/DD/YYYY] Script failing with "command not found: ^M" When I try to run the following script in zsh, via the command /bin/zsh ~/.set_color_scheme.sh I get the following error:  command not found: ^M   The script has u+x permissions and it used to work on another machine that also had zsh. Any clues why?   Note: This question is related to  (where I am trying to adapt the script for tcsh)  #!/bin/zsh # Contents of set_color_scheme.sh  export LS_COLORS=$( \ ( grep '\w' | grep -v '^#' | sed 's/#.\+//' | perl -lane 'printf "%s=%s:", shift @F, join ";", @F;' ) &lt;&lt;&lt; "  # HUMAN_FORMATTED_DATA # list one per line  # these are basic filesystem items no 00          # normal fi 00          # file di 01 34       # directory ln 00 36       # link pi 40 33       # pipe so 00 35       # bd 40 33 01 cd 40 33 01 or 01 05 37 41 mi 01 05 37 41 ex 00 91       # executable ow 01 34       # other writables   *.cmd 00 32 *.exe 00 32  # archive, compressed things etc *.gz  00 90 *.bz2 00 90 *.bz  00 90 *.tz  00 90 *.rpm 00 90 *.rar 00 90 *.zip 00 90 *.iso 00 90   *.cpio 00 31    # perl &amp; CODE *.c      33 *.h      33 *.sh     33 *.t      33 *.pm     33 *.pl     33 *.cgi    33 *.pod    33 *.PL     33 *.js     33 *.php    33 #*.xs  # strikethrough *.off 00 9 *.bak 00 9 *.old 00 9   # documents misc, html webstuff # really TEXT *.htm    94 *.html   94 *.txt    94 *.text   94 *.css    94   # MOVIE *.avi    96 *.wmv    96 *.mpeg   96 *.mpg    96 *.mov    96 *.AVI    96 *.WMV    96 *.mkv    96  # images &amp; pdf *.jpg    96 *.jpeg   96 *.png    96 *.xcf    96 *.JPG    96 *.gif    96 *.svg    96 *.eps 00 96 *.pdf 00 96 *.PDF 00 96 *.ps  00 96  *.ai  00 91 # adobe ill *.doc 00 91 # msword   # data, such as .db, .csv *.csv    95 *.dsv    95 *.db     95 *.sql    95 *.meta   95 # CONFS *.xml    95 *.yaml   95 *.yml    95 *.conf   95 # [a-z0-9]*rc ") I tried to use sudo cd name_of_dir but am getting the error message:   sudo: cd: command not found   Is there any other way to enter a directory owned by another user which has 700 permission? How to find the 'sizeof' (a pointer pointing to an array)? A formula for Perspective measurement If I have a photograph of a rectangular object whose image recedes with perspective, is it possible to work out the scale of measurements along that object?  For example: I have a photograph of a (metric) ruler.  The ruler is graduated in centimetres as shown, 30 cms.  Is it possible to work out the distance between each centimetre?  The screenshot shows the photograph.  The representation on the Picture Plane shows the nearest edge of the ruler to be 50mm and the farthest edge to be 15mm. By measuring the photo, I see that the distance between 0 and 1 is 7.5mm and the distance between 27 and 28 is 0.9mm.  Is there a way to get these results from a formula?  It doesn't need to be 100% accurate: it's for photometric software I'm writing, so it's only going to be used as a rough guide. Combined flair is showing hidden accounts The combined flair started to display in this week site icons from hidden accounts. For example, this is my current flair:  The freehand red circle shows a hidden community that you can't see in my . This issue looks to me as a privacy issue. Being associated with a SciFi community or Arqade is not a bad thing for my serious work-only profile, but it could be indeed an issue for people trying to hide association with a religious community due to the dark times that we are living on. I know that this question is similar to , but I'm posting this as  of Adam Lear Are there published predictions that hydrogen could remain metallic at ambient pressure? Below the question  there is a  that directed me to the BBC News summary . In their attempt to balance the skepticism of this particular reported observation with the potential implications of producing metallic hydrogen in a laboratory, the BBC included some far-reaching possibilities:  If that is true - and it is a controversial claim - it fulfills a more than 80-year quest to produce what many have said would be a wonder material. Theory suggests metallic hydrogen could be used to make zero-resistance electrical wiring and super-powerful rocket fuel, among many applications.  At the end of the article:  &quot;The scepticism here is probably a good thing, in that it will drive many groups towards attempting to reproduce this experiment. This publication will certainly incite the field. Again, if it holds up, this is an exciting result. I think in this case time will tell,&quot; he told BBC News.  ...referring to Marcus Knudson from Sandia National Laboratories.  And Jeffrey McMahon from Washington State University concurred: &quot;With respect to the tiny sample amount: Such experiments are performed in small diamond anvil cells. One challenge would be to make a larger quantity (at once); another, perhaps bigger challenge is to recover even the small sample (ie, remove it from the extreme pressures that it is under in the diamond anvil cell). &quot;Whether the latter is possible is an important open question.&quot;  Question: Are there published, peer-reviewed predictions that hydrogen could remain metallic at ambient pressure? A link or reference would be appreciated. If it's still in pre-print form (AeXiv) that's OK too. If it's possible, a little help understanding the prediction would be great as well: I know there are many predicted crystalline forms of water ice at elevated pressures and/or reduced temperatures, and many or most of these have been observed, but I think most of them revert once pressure is reduced to ambient. Also the  comes to mind. If there is such a prediction of the possibility of hydrogen remaining metallic at ambient, is there an analogous example of this with a material I'm more familliar with, or is this something quite new? I'd like to copy files from one external drive to a network connected drive. I want to make sure that there are no errors.  I know of MD5 hash files that I see for large single files that are download from the internet. I also know that I can use the terminal to 'diff' the two sets of files.  However, I'm looking for a piece of software that could confirm that all the files in the file structure have been copied by the finder completely, or a piece of software that would do the copying for me and confirm that all the bits are exactly the same.  The files are video related - and are often over a TB in size (not in one file - complex multi-folder nested files)  I'm fine if there is a terminal command that can do the copy and compare for me as well. (although being able to see the amount of time left on a copy is a very nice feature... additionally, I want to make sure I get ALL of the file - resource forks and all) Display only relevant reputation points How can I calculate the R-squared of a regression with arima errors using R? If I have an arima object like a:  set.seed(100) x1 &lt;- cumsum(runif(100)) x2 &lt;- c(rnorm(25, 20), rep(0, 75)) x3 &lt;- x1 + x2  dummy = c(rep(1, 25), rep(0, 75))  a &lt;- arima(x3, order=c(0, 1, 0), xreg=dummy) print(a)   .  Series: x3  ARIMA(0,1,0)                      Call: arima(x = x3, order = c(0, 1, 0), xreg = dummy)   Coefficients:         dummy       17.7665 s.e.   1.1434  sigma^2 estimated as 1.307:  log likelihood = -153.74 AIC = 311.48   AICc = 311.6   BIC = 316.67   How do calculate the R squared of this regression? Does causation imply correlation? Correlation does not imply causation, as there could be many explanations for the correlation. But does causation imply correlation? Intuitively, I would think that the presence of causation means there is necessarily some correlation. But my intuition has not always served me well in statistics. Does causation imply correlation?