Hi, I was wondering if there is any general way to display a matrix and label the rows and columns, like in latex here https://tex.stackexchange.com/questions/59517/label-rows-of-a-matrix-by-characters.
I have tried everything from here How can I label the columns and rows of a matrix? and could not find a method that works for any labels and matrix without having to adjust values by hand. Here’s an example of the type of labeling I need.
Could you share the code that makes your example in the image?
You could try:
#import "@preview/mannot:0.4.0": *
// Mark every matrix element so that it can be annotated later.
#let markmat(..args, tag: <mat>, tagsep: "", mark: mark) = {
let mktag(i, j) = label(
str(tag)
+ tagsep
+ str(i + 1)
+ tagsep
+ str(j + 1)
)
math.mat(
..args.named(),
..args.pos().enumerate().map(((i, row)) =>
row.enumerate().map(((j, entry)) =>
mark(entry, tag: mktag(i, j))
)
),
)
}
// Helper to generate tags such as <m11>, <m12>, and so on.
#let m = ((..args) =>
label(args.pos().map(str).join())
).with("m")
// Reserve enough horizontal space for annotations placed on the left.
#let reserve-left(labels, gap: 1em) = context {
let widths = labels.map(label => measure(label).width)
h(calc.max(..widths) + gap)
}
#let row-labels = (
$g_sigma^(x_1)$,
$g_sigma^(x_2)$,
$g_sigma^(x_3)$,
)
#let column-labels = (
$r^(x_4)$,
$r^(x_4)$,
)
#let row-label-gap = 1em
#let column-label-gap = 0.6em
#let leftannot = annot.with(
pos: left,
dx: -row-label-gap,
leader: false,
)
#let topannot = annot.with(
pos: top,
dy: -column-label-gap,
leader: false,
)
$
p_ell^1
= #reserve-left(
row-labels,
gap: row-label-gap,
)
markmat(
delim: "(",
1, 0;
1, 1;
0, 1;
tag: #<m>
)
// Row labels
#leftannot(m(1, 1))[#(row-labels.at(0))]
#leftannot(m(2, 1))[#(row-labels.at(1))]
#leftannot(m(3, 1))[#(row-labels.at(2))]
// Column labels
#topannot(m(1, 1))[#(column-labels.at(0))]
#topannot(m(1, 2))[#(column-labels.at(1))]
$
