3.24.1 Top new questions this week

3.24.1.1 In a pic with n args, is it possible to use the default value for only one arg?

https://tex.stackexchange.com/questions/380842/in-a-pic-with-n-args-is-it-possible-to-use-the-default-value-for-only-one-arg

Suppose I have a pic with 3 args: draw color, fill color and text of a node. 
I set the default values as: 
pics/mynode/.default={red}{olive}{My node} 
so, if I write: 
\pic {mynode}; 
TikZ uses  ...
 

- asked by CarLaTeX (9 votes), answered by egreg (6 votes)

3.24.1.2 SI inserts line break before unit

https://tex.stackexchange.com/questions/380618/si-inserts-line-break-before-unit

Not sure what has changed with siunitx but for some reason the 
\let\text\textbf 
is causing a line break before the unit is output by the \SI{<value>}{<unit>} macro when invoked outside  ...
 

- asked by Peter Grill (8 votes), answered by Ulrike Fischer (4 votes)

3.24.1.3 Why do I get different alignment when using \selectlanguage in the second coffin rather than \foreignlanguage (TL 2017)?

https://tex.stackexchange.com/questions/381264/why-do-i-get-different-alignment-when-using-selectlanguage-in-the-second-coffin

Why do I get the different alignment in the following example when I use \selectlanguage, as opposed to using \foreignlanguage? There was a spacing issue due to a Babel bug in TeX Live 2016. However,  ...
 

- asked by cfr (7 votes), answered by Joseph Wright (5 votes)

3.24.1.4 What does "&" mean in latex?

https://tex.stackexchange.com/questions/381417/what-does-mean-in-latex

I am using the align command to align equations : 
\begin{align*} 
\psi \colon & SU(2)\otimes SU(2) \otimes SU(2) \to  \mathbb{C}\\ 
&(U_{l_1} \otimes U_{l_2} \otimes U_{l_3})  \mapsto   ...
 

- asked by StarBucK (7 votes), answered by Alan Munn (9 votes)

3.24.1.5 Extracting coordinates (of a node), and the one-node-path-trick

https://tex.stackexchange.com/questions/380838/extracting-coordinates-of-a-node-and-the-one-node-path-trick

If one has nodes (vector0) and (vector1), one method to get the first and second coordinate of 
($(vector1)-(vector0)$) 
is to write 
\path ($(vector1)-(vector0)$); 
...
 

- asked by Peter Heinig (7 votes), answered by Henri Menke (12 votes)

3.24.1.6 Font table for OpenType/TrueType fonts

https://tex.stackexchange.com/questions/380775/font-table-for-opentype-truetype-fonts

How to print a font table for an OpenType/TrueType font? Can I use the fonttable package? 
A font table should have all glyphs in a font. Like the following (from The TeXBook):
 

- asked by Stone-Zeng (7 votes), answered by Herbert (10 votes)

3.24.1.7 Can custom ligatures be defined by user?

https://tex.stackexchange.com/questions/380669/can-custom-ligatures-be-defined-by-user

I hope I was not wrong in assuming that such a question has never been posted, since I haven't checked. 
Thinking about a girl, whose name is Gioia, and noticing that upper case G and and lower case a  ...
 

- asked by Enrico Maria De Angelis (7 votes), answered by Steven B. Segletes (11 votes)