Create a matrix with a for loop

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Consider the following code:

#let b = ((1,2), (3,4))

$ mat(
  #for c in b [
    $ W_(#c.at(0) #c.at(1)) "  " $ ;
]

My goal is to create a vertical vector, by using the semi-colon. However, the semi-colon is printed out and no new row is added to the matrix:

Could you please help this typst newbie?

[xkevio]

This will transform data into an array of arrays, which can then be spread into the matrix where each array is its own line.

#let data = ((1,2), (3,4), (5,6))
#let m-data = data.map(x => ($W_(#x.at(0)#x.at(1))$,))
#let matrix = math.mat(delim: "[", ..m-data)

$ #matrix $

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Thanks a lot, Kevin!