4.28.1 Top new questions this week

4.28.1.1 additional curly braces around matrix

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=443407

I would like to have matrix like this one: 
I know how to make color frames in tikz, but I havee problems with braces. 
I tried this code: 
\documentclass[a4paper,10pt]{article} 
... 
[tikz-pgf] [matrices] [braces]
 

asked by Filip Parker https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=167399 12 votes

answered by Milo https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=128068 11 votes

4.28.1.2 "Watera^\200\223pattern": a mechanical system

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=444207

I was reading an old book and I found a picture which I reproduced with TikZ. Here is the original: 
And here is my attempt and a MWE: 
\documentclass[border=5pt,tikz]{standalone} 
... 
[tikz-pgf] [pattern]
 

asked by current_user https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=166311 11 votes

answered by marmot https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=121799 8 votes

4.28.1.3 How to go beyond the impossibility to create a command whose name starts with "\end"

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=443447

The following simple file gets an error during compilation: 
\documentclass{article} 
\newcommand{\enda}{E} 
\begin{document} 
dddd 
\end{document} 
The error message is: 
! LaTeX Error: Command \enda  ... 
[macros]
                                                                                  

                                                                                  
 

asked by TT Farreo https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=167417 11 votes

answered by Joseph Wright https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=73 14 votes

4.28.1.4 Enumerate in tabular creates unwanted vertical space

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=443570

Consider 
\documentclass{article} 
\usepackage{enumitem} 
\begin{document} 
\begin{tabular}{l p{4cm}} 
Head & Content\\ 
\hline 
Foo & 
\begin{enumerate}[label={\textbf{\arabic*.}},  ... 
[tables] [enumerate] [enumitem]
 

asked by qwertz https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=90939 10 votes

answered by Bernard https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=38908 6 votes

4.28.1.5 Merge double subscripts in macro with second subscript passed as argument

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=444038

I would like to make a function \des{a}{b} that produces the following result: 
\des{Q}{1} > Q_1 
\des{Q_c}{1} > Q_{c,1} 
I have tried to adapt the code in this answer but I could not figure  ... 
[subscripts]
 

asked by Simone Gaiarin https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=148167 9 votes

answered by Steven B. Segletes https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=25858 13 votes

4.28.1.6 Wavy line, but 'randomised'

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=444276

I want to redraw this picture with TikZ: 
But I have problems with the line which is circled. I know how to draw 'normal' wavy lines, but that's not that what I want to achieve. Here is my MWE: 
... 
[tikz-pgf] [line]
 

asked by current_user https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=166311 8 votes

answered by marmot https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=121799 8 votes

4.28.1.7 Suggestion for either a pin or a hooked arrow to label an angle in a `TikZ` diagram

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=444093

The following code renders a circle circumscribing a triangle. One angle is marked $\theta$. I would like the other angle to be marked $90 - \theta$. There is not room it where it belongs. I am  ... 
[tikz-pgf] [tikz-arrows]
 

asked by user74973 https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=74973 8 votes

answered by marmot https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=121799 10 votes