7.63.3 Can you answer these questions?

7.63.3.1 How can I get R and Tikz to cooperate in a loop?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=618206

I'm using knitr and compiling my .Rnw file in Rstudio. Here's a MWE illustrating my issue. I want the code below to output "1, 2, 3" but instead it gives me "1, 1, 1". 
%%%%%%%%%%%%%... 
[tikz-pgf] [loops] [r] [knitr]
 

asked by Casey https://tex.stackexchange.com/landing/r/digest?cta=user&id=254228 1 vote

7.63.3.2 Box variable does not display its content

https://tex.stackexchange.com/landing/r/digest?cta=question&id=618313

I'd like to use box variables and cannot deal with this example: 
\newsavebox{\abox}              % declared a variable of a box type 
\sbox{\abox}{The block content} % abox := \hbox{The block content}; 
... 
[boxes] [variable]
 

asked by Vladimir https://tex.stackexchange.com/landing/r/digest?cta=user&id=252684 1 vote

7.63.3.3 tikzcd/tikz matrices: remove space in empty node to connect wires

https://tex.stackexchange.com/landing/r/digest?cta=question&id=618176

I'd like to create nodes in tikz with exactly zero space around it, notably to connect stuff to it in tikz matrices/tikz-cd. If I force the anchor to be centered it works, but I'd prefer to directly ... 
[tikz-pgf] [tikz-cd]
 

asked by tobiasBora https://tex.stackexchange.com/landing/r/digest?cta=user&id=116348 1 vote

answered by Zarko https://tex.stackexchange.com/landing/r/digest?cta=user&id=18189 0 votes