How to display content from an array vertically in a table?

Questions
2

The layout order of grid is row-major, i.e, for a sequence 0..5 you’d get:

#grid(columns: 3
  [0], [1], [2],
  [3], [4], [5],
)

As I understand it you’d like to display it in a column-major fashion for the same sequence:

#grid(columns: 3
  [0], [2], [4],
  [1], [3], [5],
)

To do this you need to transpose the sequence with respect to the number of columns, you can transpose an array by using zip followed by flatten:

#let questions2 = (  
  [2 x 1 =],
  [2 x 2 =],
  [2 x 3 =],
  [2 x 4 =],
  [2 x 5 =],
)

#let questions3 = (  
  [3 x 1 =],
  [3 x 2 =],
  [3 x 3 =],
  [3 x 4 =],
  [3 x 5 =],
)

#let questions4 = (  
  [4 x 1 =],
  [4 x 2 =],
  [4 x 3 =],
  [4 x 4 =],
  [4 x 5 =],
)

#let questions = array.zip(questions2, questions3, questions4).flatten()

#set align(center)
#grid(columns: (1fr, 1fr, 1fr), inset: 1em, ..questions)

You can see that we have exactly as many arrays as we have columns, we then zip them up such that we get a sequence of triplets, one from each sequence and then we concatenate these triplets back into one larger sequence, effectively transposing the array.

Resulting in the following output:

image
image696×309 11.6 KB

As an aside, your definitions can be automated too:

Summary 
#let questions(n, k) = range(1, k + 1).map(i => [#n x #i =])
#let questions = array.zip(..range(2, 4).map(n => questions(n, 5))).flatten()

#set align(center)
#grid(columns: (1fr, 1fr, 1fr), inset: 1em, ..questions)
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