6.25.2 Greatest hits from previous weeks

6.25.2.1 Double line spacing
6.25.2.2 Align equation left
6.25.2.3 File l3backend-pdfmode.def not found when loading expl3
6.25.2.4 Scale image to page width?
6.25.2.5 How to change certain pages into landscape/portrait mode
6.25.2.6 Using \footnote in a figure's \caption
6.25.2.7 Write pseudo code in latex
6.25.2.1 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=35 201 votes
answered by Stefan Kottwitz https://tex.stackexchange.com/landing/r/digest?cta=user&id=213 149 votes
6.25.2.2 Align equation left

https://tex.stackexchange.com/landing/r/digest?cta=question&id=145657

Here is my split equation: 
\documentclass{article} 
\usepackage{amsmath} 
\begin{document} 
\begin{equation} 
\begin{split} 
a_{ijk} =& \frac {Pr(M_{I} =2  \&  M_J=1 \& M_K =1 | I=i , J=j ,  ... 
[equations] [align]
 
asked by user35571 https://tex.stackexchange.com/landing/r/digest?cta=user&id=35571 70 votes
answered by Ludovic C. https://tex.stackexchange.com/landing/r/digest?cta=user&id=31058 72 votes
6.25.2.3 File l3backend-pdfmode.def not found when loading expl3

https://tex.stackexchange.com/landing/r/digest?cta=question&id=499082

I updated my TeXlive distribution a couple times in the past week, and now I get this error when I include package expl3 (or any other package that includes it, such as fontspec). 
Before the updates  ... 
[packages] [expl3]
 
asked by Claudio https://tex.stackexchange.com/landing/r/digest?cta=user&id=16713 30 votes
6.25.2.4 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 217 votes
answered by Werner https://tex.stackexchange.com/landing/r/digest?cta=user&id=5764 212 votes
6.25.2.5 How to change certain pages into landscape/portrait mode

https://tex.stackexchange.com/landing/r/digest?cta=question&id=337

How can I change some pages into document into landscape mode, while leaving the others in portrait mode (or vice versa)? 
[landscape]
 
asked by hayalci https://tex.stackexchange.com/landing/r/digest?cta=user&id=183 324 votes
answered by rcs https://tex.stackexchange.com/landing/r/digest?cta=user&id=118 339 votes
6.25.2.6 Using \footnote in a figure's \caption

https://tex.stackexchange.com/landing/r/digest?cta=question&id=10181

Maybe this is an easy one, but I struggled with this now too long :) 
I want to have a footnote in a caption of a figure, see the example. 
\begin{figure}[!ht] 
\caption{a figure  ... 
[floats] [footnotes] [captions]
 
asked by Matten https://tex.stackexchange.com/landing/r/digest?cta=user&id=1125 245 votes
answered by Dee https://tex.stackexchange.com/landing/r/digest?cta=user&id=16059 175 votes
6.25.2.7 Write pseudo code in latex

https://tex.stackexchange.com/landing/r/digest?cta=question&id=163768

I am trying to write pseudo code in my paper. Here is the snippet and image like what I want.  Can some one please help me to format it. 
\begin{algorithm} 
\caption{Euclida^\200\231s algorithm}\label{euclid} 
... 
[algorithms]
 
asked by cyclic https://tex.stackexchange.com/landing/r/digest?cta=user&id=47334 112 votes
answered by karlkoeller https://tex.stackexchange.com/landing/r/digest?cta=user&id=27635 155 votes