Search found 45 matches
- Fri May 09, 2014 10:08 am
- Forum: Homework
- Topic: from '((a b c d e)((f g h)(i j k))(l m n o))) to '((a b c d
- Replies: 1
- Views: 8223
Re: from '((a b c d e)((f g h)(i j k))(l m n o))) to '((a b
I'm not aware of any library function that performs that directly, but it can be accomplished fairly easily if you break it down into manageable steps. It appears that your input is a list in the form: (item1 item2 item3) and each of the items will be either a list of atoms: (atom1 atom2 atom3) or a...
- Fri Apr 25, 2014 1:25 pm
- Forum: Scheme
- Topic: Little help about define procedure
- Replies: 3
- Views: 27629
Re: Little help about define procedure
It is recommended practice in Scheme to never really DEFINE a variable that has already been DEFINEd. For interactive operations, it is permitted but it can be a source of problems/confusion. The example given isn't, IMO, especially well designed in that the 'sqrt' procedure that you define should b...
- Sun Feb 16, 2014 6:33 am
- Forum: The Lounge
- Topic: Original Lisp Eliza added to Eliza Gen collection
- Replies: 3
- Views: 17711
Re: Original Lisp Eliza added to Eliza Gen collection
The transcription is apparently complete and the text files made available on Github.
A clisp version by Peter De Wachter, Matt Niemeir, and Jeff Shrager is also available for download.
A clisp version by Peter De Wachter, Matt Niemeir, and Jeff Shrager is also available for download.
- Fri Nov 01, 2013 10:22 am
- Forum: Homework
- Topic: Cannibals and missionaries help!!!
- Replies: 1
- Views: 9436
Re: Cannibals and missionaries help!!!
In your 'safe' procedure, you have 'nil' as part of the first predicate of the 'cond' (and serves no purpose in this position). It should be the evaluated consequent.
In other words, one of the closing parentheses is in the wrong place.
In other words, one of the closing parentheses is in the wrong place.
- Thu Oct 24, 2013 5:58 pm
- Forum: Common Lisp
- Topic: Quicksort?
- Replies: 2
- Views: 6004
Re: Quicksort?
The bindings in a let block are not guaranteed to be handled in sequence. They might be evaluated in a different order than specified, or evaluated in parallel on a multi-threaded implementation. If you wish to have the bindings evaluated in a specific order (so later bindings can reference earlier ...
- Sun Oct 13, 2013 9:40 am
- Forum: Homework
- Topic: Knight Project
- Replies: 6
- Views: 16352
Re: Knight Project
The problem you've stated does not actually require that you create a chessboard. When your program attempts to move a piece, it cares whether 1) you have exceeded the 'upper limit' for number of moves allowed, 2) the move is valid for a knight, 3) the destination square lands on the chessboard, and...
- Thu Oct 10, 2013 4:22 am
- Forum: Homework
- Topic: Knight Project
- Replies: 6
- Views: 16352
Re: Knight Project
The stated problem can be simplified to the task of finding the shortest path from the white knight's starting square to the black knight's starting square. The actual place where the knights meet each other would lie midway along this path. Unlike the Knight's Tour problem, there are an infinite nu...
- Mon Apr 29, 2013 7:14 pm
- Forum: The Lounge
- Topic: Hello, am I even in the right place?
- Replies: 9
- Views: 30995
Re: Hello, am I even in the right place?
If you tire of reading, there are some great video lectures by Hal Abelson and Gerald Sussman available from MIT (link below). The videos are from the 1980s -- so no laptops hooked up to video projectors showing powerpoint slides -- but the material is still relevant, and pretty easy to follow (thou...
- Wed Apr 24, 2013 4:09 pm
- Forum: Scheme
- Topic: Simply Scheme Exercises. Chapter 06 True and False.
- Replies: 3
- Views: 28044
Re: Simply Scheme Exercises. Chapter 06 True and False.
Your interpreter should return the value 3 for the cond expression.korekaradesu wrote:But in the interpreter, it returns the value of (empty? 3).
- Sat Apr 20, 2013 4:30 am
- Forum: Scheme
- Topic: A pair of lists
- Replies: 0
- Views: 10011
A pair of lists
I am writing a tutorial on developing a Scheme compiler and one of the data structures I am using is a pair of lists, where the car of the pair is a list of the symbols and the cdr of the pair is a list of their values. For example, an a-list of the data might be ' ((a . 10) (b . 20) (c . 30)) And t...