Re: [clisp-list] sorting a list of sublists, based on the sublists first value

[Russell M. <rus...@ya...>]

This can be handled using the :key keyword arg to sort,
like so:

  (sort '((50 3500) (25 2570) (40 2800))
        #'<
        :key #'first)

-russ

"David Brynjar Franzson" <fra...@st...> writes:

> Hi, I am trying to sort a list containing sublists ((50 3500) (25 2570) (40
> 2800)) based on the first value of each sublist.
>
> A normal sort-list function is sth like this...
>
> (defun sort-list (list &optional (pred '<))
>     (cond ((null) list) nil )
>         ((atom (first list)) (sort list pred))
>             (t (cons (sort-list (first list) pred) (sort-list (rest list)
> pred)))))
>
> Being almost completely illiterate in Lisp, I am guessing that I just need
> to plugin in sth in the order of "(nth 0 sublist)" somewhere in this
> function.
>
> Any help on this would be greatly appreciated.
>
> Sincerely,
> David B Franzson
> fra...@ho...
>
>
>
>
>
>
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