11.56.1 Top new questions this week

11.56.1.1 How to draw this nested heptagon with proper length scale?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=749785

Description: 
I want to plot this following image: 
It seemed that both the inner and outer figure are both regular heptagon. 
Code: 
Now I give the tried of the below: 
\documentclass[tikz,border=3pt]{... 
[tikz-pgf] [polygon]
 

asked by Explorer https://tex.stackexchange.com/landing/r/digest?cta=user&id=322482 Score of 14

answered by kabenyuk https://tex.stackexchange.com/landing/r/digest?cta=user&id=204924 Score of 12

11.56.1.2 Non-linear transformation of text

https://tex.stackexchange.com/landing/r/digest?cta=question&id=749813

My end goal is to apply a specific wave warp to a short block of text in line with a style guide. 
Below is my attempt. 
I've applied the transform to a 4 by 4 grid and it behaves as I want with the ... 
[tikz-pgf] [transformation] [metafun] [luamplib] [l3draw]
 

asked by David Purton https://tex.stackexchange.com/landing/r/digest?cta=user&id=87678 Score of 13

answered by Dohyun Kim https://tex.stackexchange.com/landing/r/digest?cta=user&id=59818 Score of 13

11.56.1.3 Why does the definition of \newif use a \edef with \noexpand instead of a \def in plain \TeX?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=749792

I have been experimenting with the \newif construction in plain \TeX. To keep my experiments from clashing with plain \TeX, I changed the definition slightly to 
\outer\def\znewif#1{\count255=\... 
[macros] [expansion] [plain-tex]
                                                                                  

                                                                                  
 

asked by Unclechromedome https://tex.stackexchange.com/landing/r/digest?cta=user&id=411063 Score of 10

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 5

11.56.1.4 3 springs in series tikz

https://tex.stackexchange.com/landing/r/digest?cta=question&id=749731

To illustrate the propagation of longitudinal waves using a spring, I'd like to create a diagram similar to this one. 
I've already created the following code, but the result isn't very good. 
% Author:... 
[tikz-pgf]
 

asked by Antoine https://tex.stackexchange.com/landing/r/digest?cta=user&id=249383 Score of 9

answered by Jasper https://tex.stackexchange.com/landing/r/digest?cta=user&id=319072 Score of 7

11.56.1.5 What are the exact rules about spaces surrounding macro parameters/arguments?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=749895

To my surprise, the TeXbook (page 203) mentions that the first argument in 
\cs AB {\Look}C${And\$ }{look}\$ 5. 
where \cs is defined as 
\def\cs AB#1#2C$#3\$ {#3{ab#1}#1 c##\x #2} 
is \Look, and not [... 
[spacing] [tex-core] [plain-tex] [parameters] [texbook]
 

asked by INEEDANSWERS https://tex.stackexchange.com/landing/r/digest?cta=user&id=242971 Score of 7

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 6

11.56.1.6 \use:e and \expanded

https://tex.stackexchange.com/landing/r/digest?cta=question&id=749830

Questions: What is the difference between \use:e and \expanded? I don't understand why \use:e has to absorb an argument first before passing it to \expanded. Why isn't \use:e defined to be  a copy of \... 
[expl3]
 

asked by User23456234 https://tex.stackexchange.com/landing/r/digest?cta=user&id=278534 Score of 7

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 7

11.56.1.7 How may Unicode symbols be indexed?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=749783

Confer May imakeidx line up the indexed pages better, and avoid the comma separator?, which constitutes one basis for this question. 
I have problems with indexing unicode symbols. To understand the ... 
[unicode] [indexing]
 

asked by Frode Alfson BjA~,rdal https://tex.stackexchange.com/landing/r/digest?cta=user&id=24406 Score of 7

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 7