On Sep 25, 9:05 pm, Xah Lee <xah...@gmail.com> wrote: > here's a interesting toy list processing problem. > > I have a list of lists, where each sublist is labelled by > a number. I need to collect together the contents of all sublists > sharing > the same label. So if I have the list > > ((0 a b) (1 c d) (2 e f) (3 g h) (1 i j) (2 k l) (4 m n) (2 o p) (4 q > r) (5 s t)) > > where the first element of each sublist is the label, I need to > produce: > > output: > ((a b) (c d i j) (e f k l o p) (g h) (m n q r) (s t)) > ...
thanks all for many interesting solutions. I've been so busy in past month on other computing issues and writing and never got around to look at this thread. I think eventually i will, but for now just made a link on my page to point to here. now we have solutions in perl, python, ruby, common lisp, scheme lisp, mathematica. I myself would also be interested in javascript perhps i'll write one soon. If someone would go thru all these solution and make a good summary with consistent format/names of each solution... that'd be very useful i think. (and will learn a lot, which is how i find this interesting) PS here's a good site that does very useful comparisons for those learning multiple langs. * 〈Lisp: Common Lisp, Scheme, Clojure, Emacs Lisp〉 http://hyperpolyglot.wikidot.com/lisp * 〈Scripting Languages: PHP, Perl, Python, Ruby, Smalltalk〉 http://hyperpolyglot.wikidot.com/scripting * 〈Scripting Languages: Bash, Tcl, Lua, JavaScript, Io〉 http://hyperpolyglot.wikidot.com/small * 〈Platform Languages: C, C++, Objective C, Java, C#〉 http://hyperpolyglot.wikidot.com/c * 〈ML: Standard ML, OCaml, F#, Scala, Haskell〉 http://hyperpolyglot.wikidot.com/ml Xah ∑ http://xahlee.org/ ☄ -- http://mail.python.org/mailman/listinfo/python-list