7.25.2 Greatest hits from previous weeks

7.25.2.1 Scale image to page width?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=39147

I use 
\inclugraphics[scale=TRYING TO GUESS THE NUMBER FOR PAGE WIDTH]{...} 
but I find this errorsome, is there some ready flag to set the image to page width? I usually use PNG and JPG photos. 
[graphics] [scaling]
 

asked by hhh https://tex.stackexchange.com/landing/r/digest?cta=user&id=2956 242 votes

answered by Werner https://tex.stackexchange.com/landing/r/digest?cta=user&id=5764 230 votes

7.25.2.2 Problem with compiling BibTex: "no \citation commands" error

https://tex.stackexchange.com/landing/r/digest?cta=question&id=18045

I'm really new to BibTex, I just wonder what is going wrong when I have this kind of error when I try to compile my bibliography file. 
I found no \citation commands---while reading file masterthesis.... 
[bibliographies] [bibtex]
 

asked by zfm https://tex.stackexchange.com/landing/r/digest?cta=user&id=3559 83 votes

answered by Spike https://tex.stackexchange.com/landing/r/digest?cta=user&id=5150 31 votes

7.25.2.3 tlmgr cannot setup TLPDB

https://tex.stackexchange.com/landing/r/digest?cta=question&id=137428

I'm trying to update my installation of texlive 2013 under Ubuntu 13.10. 
However, I followed the instruction on this answer, but I get an error 
(running on Debian, switching to user mode!) 
cannot ... 
[errors] [texlive] [ubuntu]
 

asked by adn https://tex.stackexchange.com/landing/r/digest?cta=user&id=7561 220 votes

answered by ppr https://tex.stackexchange.com/landing/r/digest?cta=user&id=28474 208 votes

7.25.2.4 How to write two dot above a letter?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=152951

the two dots above a letter represents two derivative of varible t. 
My method: 
\documentclass[UTF8]{ctexart} 
\usepackage{amsmath} 
\usepackage{amssymb} 
\usepackage{graphicx} 
\usepackage{epstopdf} 
\... 
[math-mode] [accents]
 

asked by mma https://tex.stackexchange.com/landing/r/digest?cta=user&id=43727 112 votes

answered by Cain https://tex.stackexchange.com/landing/r/digest?cta=user&id=28428 154 votes

7.25.2.5 Double line spacing

https://tex.stackexchange.com/landing/r/digest?cta=question&id=819

I would like to typeset a draft of my document with double linespacing so that my collaborators have space to write in their edits (with a pen).  How do I do it? 
[line-spacing] [setspace]
 

asked by Vebjorn Ljosa https://tex.stackexchange.com/landing/r/digest?cta=user&id=35 220 votes

answered by Stefan Kottwitz https://tex.stackexchange.com/landing/r/digest?cta=user&id=213 162 votes

7.25.2.6 What is the degree symbol?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=384873

In order to have the following output involving the degree symbol 
I can try 
\documentclass{report} 
\begin{document} 
The angle is 30$^\circ$. 
\end{document} 
However, this is an awkward manner to ... 
[typography] [degrees]
 

asked by Viesturs https://tex.stackexchange.com/landing/r/digest?cta=user&id=114719 87 votes

answered by Ulrike Fischer https://tex.stackexchange.com/landing/r/digest?cta=user&id=2388 77 votes

7.25.2.7 How to write cases with LaTeX?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=240868

The code i used to write 
is this one 
$$ 
X(m,n)= 
\begin{cases} 
x(n),\\ 
x(n-1)\\ 
x(n-1) 
\end{cases} 
$$ 
But I don't know how to write this one 
I appreciate any help. 
Edited: I'm sorry to add this ... 
[math-mode] [cases]
                                                                                  

                                                                                  
 

asked by MaryA~ https://tex.stackexchange.com/landing/r/digest?cta=user&id=65856 165 votes

answered by Ignasi https://tex.stackexchange.com/landing/r/digest?cta=user&id=1952 120 votes