Question

I have to represent a board game using lisp. To do that i have to create a function that builds the board.

This function receives an integer that represents the number of sublist the original list as to have. each one of this sublists have a different size growing in 3*n proportion.
As an example ifthe function is called with the number 3, it will create a list with 3 sublists, the first with 3 position, the second with six and the third with 9.

Also, each of the positions need to be initialized with ´*.

To do this i think i have to make a recursive call to make-list, but i can’t seem to do that right. i’be tried to use the ‘dotimes’ cycle to do that, but i didn’t have any sucess with that.

So far i have:

(defun faz-tabuleiro (n_aneis)
    (make-list n_aneis :initial-element (...)

Wich creates the main list, but how can i represent the sublists inside with the right size?

Answer 1

Does this do what you want?

(defun make-table (n)
  (loop :for i :from 1 :to n
        :collect (make-list (* i 3) :initial-element "*")))