Resolved: Lisp: How to set element in list of lists?

Question:

I am familiar with how to set elements in a 2D array, which can be done using the following statement.

(setf (aref array2D 0 0) 3)

However, I am not familiar how to set elements in a list of lists, such as the following input: '((1) (2) (2) (1)). I can’t use aref, since it only works on arrays.

Answer:

As mentioned, while aref works on arrays, elt works on sequences which can be:

1. an ordered collection of elements
2. a vector or a list.

* (setf test-list '((1) (2) (2) (1)))
((1) (2) (2) (1))
* (setf (elt test-list 2) 'hi)
HI
* test-list
((1) (2) HI (1))

You can indeed use variables in place of fixed offsets:

* (setf test-list '((1) (2) (2) (1)))
((1) (2) (2) (1))
* (setf offset 2)
2
* (setf (elt test-list offset) 'hi)
HI
* test-list
((1) (2) HI (1))

If you have better answer, please add a comment about this, thank you!