Re: Making a list of lists

[uzibalqa <uzibalqa@proton.me>]

------- Original Message -------
On Tuesday, July 4th, 2023 at 5:56 AM, Sebastian Miele <iota@whxvd.name> wrote:


> > From: uzibalqa uzibalqa@proton.me
> > Date: Mon, 2023-07-03 17:51 +0000
> > 
> > > > Suppose I have mylist, with a number of lists constructed as follows
> > > > 
> > > > (setq mylist '())
> > > > (setq entry1 (linseq "A" "B" "C"))
> > > > (setq entry2 (linseq "D" "E" "F"))
> > > > 
> > > > Then how do I add entry1 and entry2, to mylist ?
> > > 
> > > Examples:
> > > 
> > > (setq mylist (cons entry1 (cons entry2 mylist)))
> > > (push entry2 mylist) (push entry1 mylist)
> > > (add-to-list 'mylist entry2) (add-to-list 'mylist entry1)
> > > (setq mylist `(,entry1 ,entry2 ,@mylist))
> > 
> > Can push be used with multiple entries ?
> > 
> > (push entry1 entry2 mylist)
> 
> 
> No. (Both the Emacs Lisp manual, and C-h f push RET, mention that.)
> 
> > I would like to write a function that pushes a whole list to a list, to make
> > a list of lists, called a chart.
> 
> 
> I do not know what a chart is. Maybe

I define a chart to be a list of lists, with each sublist being a row of a chart.

Thus

chart is (("row1" "r11" "r12") ("row2" "" "r21" "r22")) 
 
> (setq mylist nil
> l1 '(a b c)
> l2 '(d e f))
> (setq mylist `(,@l1 ,@l2 ,@l))
> 
> is what you want. Read about the "backquote construct" in the Emacs
> Lisp manual. Another function to explore in this context is ‘append’:
> 
> (setq mylist (append l1 l2 mylist))
> 
> > Here is my function, but need some form of loop, to traverse all the
> > function arguments.
> > 
> > (defun linseq (&rest sequence)
> > sequence)
> > 
> > (defun attach (chart &rest linsq)
> > (apply #'push linsq chart))
> 
> 
> Again, I do not exactly understand what you want to acheive.
> 
> ‘apply’ would not work in that example, because of its special handling
> of its last parameter. ‘funcall’ would. But neither is necessary here.
> 
> In principle, e.g., ‘mapc’ yields a way to loop over elements of a list
> (for side-effects only). But looping probably is not necessary, too.
> 
> It is my strong impression, that you should take the time and work
> through a general introduction to (Emacs) Lisp first. A lack of that
> background just is too limiting.