Vector addition of lists

Posted by ntimes on Stack Overflow See other posts from Stack Overflow or by ntimes
Published on 2010-03-15T15:20:39Z Indexed on 2010/03/15 19:49 UTC
Read the original article Hit count: 369

Filed under:

lisp

|

Scheme

|

beginner

If I had a N lists each of length M, how could I write a nice clean function to return a single list of length M, where each element is the sum of the corresponding elements in the N lists?

(starting to learn lisp - go easy!)

© Stack Overflow or respective owner

Related posts about lisp

Why is Lisp useful?

as seen on Programmers - Search for 'Programmers'
Lisp obviously is an advantage for the AI stuff but it doesn't appear to me that Lisp is any faster than Java, C#, or even C. I am not a master of Lisp, but I find it incredibly difficult to understand the advantage one would get in writing Business Software in Lisp. Yet it is considered as a hacker's… >>> More
Why do you like Lisp ?

as seen on Programmers - Search for 'Programmers'
Why does Paul Graham advocate Lisp? Why did ITA Software choose Lisp over other High Level languages? Lisp obviously is an advantage for the AI stuff but I don't think Lisp is any faster than Java, C# or as a matter of fact faster than C. Still it is considered as a Hackers language? I am not a master… >>> More
Emacs 23.1 make error 139 in Mac OS X 10.6.3

as seen on Stack Overflow - Search for 'Stack Overflow'
When I try to compile GNU Emacs 23.1 on my machine with Mac OS X 10.6.3 I repeatedly get the following ending: Directories: /src/emacs-23.1/lisp/. /src/emacs-23.1/lisp/./calc /src/emacs-23.1/lisp/./calendar /src/emacs-23.1/lisp/./emacs-lisp /src/emacs-23.1/lisp/./emulation /src/emacs-23.1/lisp/./erc… >>> More
Why not port Linux kernel to Common Lisp?

as seen on Stack Overflow - Search for 'Stack Overflow'
Conventional wisdom states that OS kernels must be written in C in order to achieve the necessary levels of performance. This has been the justification for not using more expressive high level languages. However, for a few years now implementations of Common Lisp such as SBCL have proven to be… >>> More
Lisp Style question label local functions or not?

as seen on Stack Overflow - Search for 'Stack Overflow'
I was wondering if there is a standard practice regarding the use of labels in Lisp. I've been messing around with a Lisp implementation of the algorithm described in the first answer here http://stackoverflow.com/questions/352203/generating-permutations-lazily My current version uses labels to… >>> More

Related posts about Scheme

About "If.." in Scheme (plt-scheme)

as seen on Stack Overflow - Search for 'Stack Overflow'
I had a pretty simple requirement in my Scheme program to execute more than one statement, in the true condition of a 'if'. . So I write my code, something like this: (if (= 1 1) ((expression1) (expression2)) ; these 2 expressions are to be executed when the condition is true (expression3)… >>> More
Detecting EOF in a Binary File using Scheme

as seen on Stack Overflow - Search for 'Stack Overflow'
(define (read-all-input) (local ((define line (bytes->list (read-bytes 4)))) (if (eof-object? line) empty (cons line (read-all-input))))) (void (read-all-input)) The above code fails because bytes-list expects an argument of type byte string, but is given # >>> More
Scheme: Detecting duplicate elements in a list

as seen on Stack Overflow - Search for 'Stack Overflow'
Does R6RS or Chez Scheme v7.9.4 have a library function to check if a list contains duplicate elements? Alternatively, do either have any built in functionality for sets (which dis-allow duplicate elements)? So far, I've only been able to find an example here. The problem with that is that it doesn't… >>> More
Scheme implementations - what does it mean?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'm a beginning student in CS, and my classes are mostly in Java. I'm currently going through "Little Schemer" as a self study, and in the process of finding out how to do that I have found numerous references to "implementations" of Scheme. My question is, what are implementations? Are they… >>> More
Traversing Scheme function as a list

as seen on Stack Overflow - Search for 'Stack Overflow'
Isn't it possible to treat functions in Scheme as any other list? Basically, what I want do to is something like this: (define (foo) "hello") (cdr foo) ; or similar, should return the list ((foo) "hello") I've found a similar discussion about this, and I feel a bit disappointed if this is not… >>> More