7.7.1 Top new questions this week

7.7.1.1 Expand an argument into a string
7.7.1.2 tikz: Log-Log Graph Missing Grid Lines
7.7.1.3 Why does `xstring`s `\StrBefore` work, but not `\IfBeginWith`?
7.7.1.4 Table formatting: remove horizontal and vertical borders from only specific cells
7.7.1.5 Underbrace under square root sign plain TeX
7.7.1.6 Half-drawn crossings when using `double` with `knots`
7.7.1.7 How can I add line breaks to the end of a macro?
7.7.1.1 Expand an argument into a string

https://tex.stackexchange.com/landing/r/digest?cta=question&id=580190

I would like to build a TeX macro that would transform its argument by expanding every number into a sequence of letter (always the same letter). For example 3(2)2(1) should produce AAA(AA)AA(A). 
I ... 
[macros] [tex-core]
 
asked by perror https://tex.stackexchange.com/landing/r/digest?cta=user&id=23294 7 votes
answered by David Carlisle https://tex.stackexchange.com/landing/r/digest?cta=user&id=1090 6 votes
7.7.1.2 tikz: Log-Log Graph Missing Grid Lines

https://tex.stackexchange.com/landing/r/digest?cta=question&id=579951

I am attempting to plot a log-log graph with bounds not falling on a factor of 10.  In my case, the y-axis goes from ymin=0.3 to ymax=300.  As you can see in the screenshot, the minor grid lines for y=... 
[tikz-pgf]
 
asked by grfrazee https://tex.stackexchange.com/landing/r/digest?cta=user&id=81543 7 votes
7.7.1.3 Why does `xstring`s `\StrBefore` work, but not `\IfBeginWith`?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=580552

I'm currently using the package showkeys to debug the labels in my document. Using the command \renewcommand{\showkeyslabelformat}[1]{...} one can customise the display of the labels. I want to handle ... 
[conditionals] [labels] [xstring] [showkeys]
 
asked by rshkadhttkqwkqknhd https://tex.stackexchange.com/landing/r/digest?cta=user&id=233702 6 votes
answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 5 votes
7.7.1.4 Table formatting: remove horizontal and vertical borders from only specific cells

https://tex.stackexchange.com/landing/r/digest?cta=question&id=580245

The MWE below creates a 3 x 3 table. The included text above the table describes the specific cells where I want no borders. 
I believe the solutions lies with the correctly using \cline command ... 
[tables] [formatting]
 
asked by WyoWindStorm https://tex.stackexchange.com/landing/r/digest?cta=user&id=184615 6 votes
answered by Zarko https://tex.stackexchange.com/landing/r/digest?cta=user&id=18189 6 votes
7.7.1.5 Underbrace under square root sign plain TeX

https://tex.stackexchange.com/landing/r/digest?cta=question&id=580082

$$ 
\rlap{$\sqrt{\phantom{\displaystyle\pmatrix{A^{-1} b(x)\cr -1}^T 
\pmatrix{A & b(x) \cr b(x)^T & \Phi(x,x)} 
\pmatrix{A^{-1} b(x) \cr -1}}}$} 
\mskip14mu 
\... 
[math-mode] [plain-tex] [underbrace] [sqrt]
 
asked by User https://tex.stackexchange.com/landing/r/digest?cta=user&id=43121 6 votes
answered by Mico https://tex.stackexchange.com/landing/r/digest?cta=user&id=5001 6 votes
7.7.1.6 Half-drawn crossings when using `double` with `knots`

https://tex.stackexchange.com/landing/r/digest?cta=question&id=580472

I have something similar to the following code (apologies for the long example but this is fairly sensitive to precise numbers): 
\documentclass{article} 
\usepackage{tikz} 
\usetikzlibrary{ 
knots, 
... 
[tikz-pgf] [tikz-knots]
 
asked by Chris Le Sueur https://tex.stackexchange.com/landing/r/digest?cta=user&id=51237 5 votes
answered by Andrew Stacey https://tex.stackexchange.com/landing/r/digest?cta=user&id=86 3 votes
7.7.1.7 How can I add line breaks to the end of a macro?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=580600

I want to simplify the writing of this content, which should appear tabulated. 
I've written two macros to indent and colored a^\204\[Sterling] and a^\204\237. And I want to avoid having to always write \par at the end of each ... 
[macros] [environments] [best-practices]
 
asked by A. Cedano https://tex.stackexchange.com/landing/r/digest?cta=user&id=163311 5 votes
answered by David Carlisle https://tex.stackexchange.com/landing/r/digest?cta=user&id=1090 5 votes