6.29.1 Top new questions this week

6.29.1.1 Iteratively define a matrix

https://tex.stackexchange.com/landing/r/digest?cta=question&id=548867

I was wondering if there is any way to iteratively define a matrix in LaTeX? 
For example, say I wanted to write the following matrix: 
Of course, I could write this matrix by hand using a bmatrix  ... 
[macros] [matrices]
 

asked by Burnished Sandalwood https://tex.stackexchange.com/landing/r/digest?cta=user&id=181311 12 votes

answered by ZhiyuanLck https://tex.stackexchange.com/landing/r/digest?cta=user&id=201158 12 votes

6.29.1.2 Get the first and second character of a macro argument

https://tex.stackexchange.com/landing/r/digest?cta=question&id=549200

I have a situation where I need the first and second character of a macro argument extracted separately. The input is always two characters long and is always non-special text. I am aware there are  ... 
[characters]
 

asked by junius https://tex.stackexchange.com/landing/r/digest?cta=user&id=88275 8 votes

answered by moewe https://tex.stackexchange.com/landing/r/digest?cta=user&id=35864 10 votes

6.29.1.3 Improving My TikZ Code for Making a Schedule

https://tex.stackexchange.com/landing/r/digest?cta=question&id=549463

I made a course schedule using TikZ, but my code is inelegant and inefficient. Most of the steps are repeated for each course, so I would like to see how to combine them. I would also like to make the  ... 
[tikz-pgf]
 

asked by bclzyjhr https://tex.stackexchange.com/landing/r/digest?cta=user&id=206908 7 votes

answered by SchrA~\[Paragraph]dinger's cat https://tex.stackexchange.com/landing/r/digest?cta=user&id=194703 11 votes

6.29.1.4 Reprinting equations

https://tex.stackexchange.com/landing/r/digest?cta=question&id=549171

Suppose I have an equation like : 
\begin{align} \label{eq:ajk} 
a_{jk} = a_{j} - a_{k} %suppose this is a very very long equation with many lines 
\end{align} 
How can I print the exact same equation  ... 
[equations] [hyperref] [amsmath]
 

asked by Nitin https://tex.stackexchange.com/landing/r/digest?cta=user&id=213849 7 votes

answered by Partha D. https://tex.stackexchange.com/landing/r/digest?cta=user&id=146828 8 votes

6.29.1.5 Circuitikz Current Label Placement

https://tex.stackexchange.com/landing/r/digest?cta=question&id=549631

This is a follow-up question on this. In the aforementioned question, the current label I_\textrm{G} = 0 is overlapping with a resistor, so I ask about current arrow and label placement. 
Code: 
... 
[circuitikz]
 

asked by Superman https://tex.stackexchange.com/landing/r/digest?cta=user&id=204403 6 votes

answered by ZhiyuanLck https://tex.stackexchange.com/landing/r/digest?cta=user&id=201158 5 votes

6.29.1.6 Simple recursion in LaTeX

https://tex.stackexchange.com/landing/r/digest?cta=question&id=549421

I am trying to get into LaTeX recursion and created a command \tower[2][3][4][2] that returns a power tower, 2^{3^{4^2}}, for any number of arguments. My attempt: 
\documentclass{beamer} 
... 
[recursion]
 

asked by Edgar Perner https://tex.stackexchange.com/landing/r/digest?cta=user&id=218234 6 votes

answered by F. Pantigny https://tex.stackexchange.com/landing/r/digest?cta=user&id=163000 6 votes

6.29.1.7 TikZ - Explain the computation of the determinant of a square matrix of dimension 3

https://tex.stackexchange.com/landing/r/digest?cta=question&id=549487

I would like to show the classical trick to calculate the determinant of a square matrix of dimension 3. Here is my very beginning code. 
\documentclass{article} 
\usepackage{tikz} 
... 
[tikz-pgf]
 

asked by projetmbc https://tex.stackexchange.com/landing/r/digest?cta=user&id=6880 6 votes

answered by SchrA~\[Paragraph]dinger's cat https://tex.stackexchange.com/landing/r/digest?cta=user&id=194703 10 votes