10.10.2 Greatest hits from previous weeks

10.10.2.1 What does the phrase "Underfull \hbox (badness 10000) in paragraph" actually mean?
10.10.2.2 Multi-line (block) comments in LaTeX
10.10.2.3 Change image size
10.10.2.4 Subfigures side by side with captions
10.10.2.5 How to write a function (piecewise) with bracket outside?
10.10.2.6 How to change certain pages into landscape/portrait mode
10.10.2.7 How do you get \mathbb 1  to work (characteristic function of a set)?
10.10.2.1 What does the phrase "Underfull \hbox (badness 10000) in paragraph" actually mean?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=334246

What does the actual phrase above mean? 
[errors] [tex-core] [boxes] [paragraphs] [underfull]
 
asked by Charles Boehm https://tex.stackexchange.com/landing/r/digest?cta=user&id=116447 Score of 125
answered by David Carlisle https://tex.stackexchange.com/landing/r/digest?cta=user&id=1090 Score of 103
10.10.2.2 Multi-line (block) comments in LaTeX

https://tex.stackexchange.com/landing/r/digest?cta=question&id=87303

In LaTeX, % can be used for single-line comments. For multi-line comments, the following command is available in the verbatim package. 
\begin{comment} 
Commented code 
\end{comment} 
But is there a ... 
[comments]
 
asked by Arindam Pal https://tex.stackexchange.com/landing/r/digest?cta=user&id=17379 Score of 342
answered by guillem https://tex.stackexchange.com/landing/r/digest?cta=user&id=3941 Score of 278
10.10.2.3 Change image size

https://tex.stackexchange.com/landing/r/digest?cta=question&id=64836

I'm trying to change the image size (make it look smaller than the original). 
I tried with the next code but the image still shows at its original size. 
\begin{figure}[h!] 
\centering 
\... 
[graphics]
 
asked by Enrique https://tex.stackexchange.com/landing/r/digest?cta=user&id=16973 Score of 122
answered by DJJerome https://tex.stackexchange.com/landing/r/digest?cta=user&id=2863 Score of 116
10.10.2.4 Subfigures side by side with captions

https://tex.stackexchange.com/landing/r/digest?cta=question&id=119984

I am using the following code to put my two figures side by side with different captions, 
\begin{figure*}[t!] 
\centering 
\begin{subfigure}[b]{0.5\textwidth} 
\centering 
\... 
[captions] [subfloats]
 
asked by Sait https://tex.stackexchange.com/landing/r/digest?cta=user&id=14611 Score of 123
answered by latex user https://tex.stackexchange.com/landing/r/digest?cta=user&id=25372 Score of 172
10.10.2.5 How to write a function (piecewise) with bracket outside?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=32140

How to write this Piecewise function using LaTeX? 
I tried 
$ 
\begin{array}{cc} 
\{ & 
\begin{array}{cc} 
0 & x\leq 0 \\ 
\frac{100-x}{100} & 0\leq x\leq 100 \\ 
0 & ... 
[math-mode] [equations] [brackets]
 
asked by GarouDan https://tex.stackexchange.com/landing/r/digest?cta=user&id=5314 Score of 211
answered by Ant https://tex.stackexchange.com/landing/r/digest?cta=user&id=6984 Score of 260
10.10.2.6 How to change certain pages into landscape/portrait mode

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

How can I change the orientation of some pages of my 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 Score of 443
answered by rcs https://tex.stackexchange.com/landing/r/digest?cta=user&id=118 Score of 458
10.10.2.7 How do you get \mathbb 1  to work (characteristic function of a set)?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=26637

I am trying to get the digit one printed the \mathbb{} font in math mode, however the command 
\mathbb{1} 
outputs some rubbish. I certainly saw the character I am after in some pdf's generated from ... 
[math-mode] [formatting]
 
asked by Grzenio https://tex.stackexchange.com/landing/r/digest?cta=user&id=3329 Score of 243