All Questions
13 questions
1
vote
2
answers
145
views
Scheme - function to count occurrences of atom in argument
I'm new to scheme and trying to learn functions. I want to create a function where I can count all occurrences of the atom "a" in an argument. This is what I have written so far. I'm not ...
- 11
2
votes
1
answer
53
views
Understanding a construction (para . contents) and continuing education
I've just started the Scheme Lisp learning and needed some illumination. I've hit a snippet at a site https://www.gnu.org/software/guile/manual/html_node/Types-and-the-Web.html that I haven't caught (...
- 1,501
2
votes
2
answers
1k
views
Passing a function as an argument - lambda expression error?
I am trying to create a function that accepts a list and a function as parameters and applies that function to each element in the List.
Here is my attempt:
(defun filter(fn L)
(if (eq 0 (length L))...
- 137
10
votes
1
answer
952
views
Clojure, can macros do something that couldn't be done with a function
I'm learning Clojure macros, and wonder why we can't use just functions for metaprogramming.
As far as I know the difference between macro and function is that arguments of macro are not evaluated ...
- 23.6k
1
vote
5
answers
972
views
Why some? returns true when it takes false as a parameter in Clojure?
I couldn't understand the intent of some? function in Clojure.
I need some function(built-in) that returns false when it takes (nil or false).
Here is the example:
(some? "1")
=> true
(some? ...
- 5,231
2
votes
3
answers
268
views
What are those functional functions called?
I'm looking for a functional way to implement this:
list = [a b c d e f]
foo(list, 3) = [[a d] [b e] [c f]]
A potential solution is:
foo(list,spacing) = zip(goo(list,spacing))
Where, for example,
...
- 53.1k
0
votes
2
answers
2k
views
Evaluate function from list in lisp
I need to write a function in lisp with two arguments - list of argumentless functions and list of integers.
I need to evaluate functions from first list in order given by a second, i.e. (fun '(#'a #'...
- 2,473
3
votes
4
answers
7k
views
Scheme - have a function return a function
I want to use this code in the following way:
if I enter:
((function1 5) 2)
where function1 executes its procedure based off the 5, and returns a function2 that executes something based on the 2. Is ...
- 6,105
3
votes
2
answers
190
views
Why can't I use the function symbol(#') extracted from the list in Common lisp?
The first one doesn't work.
But the second one works,which make me confused..
Could anyone explain a bit about that?
CL-USER> (funcall (first '(#'+ +)) 1)
; Evaluation aborted on #<TYPE-ERROR ...
- 47.2k
7
votes
1
answer
3k
views
Too many arguments for function
I'm starting to learn Lisp with a Java background. In SICP's exercise there are many tasks where students should create abstract functions with many parameters, like
(define (filtered-accumulate ...
- 15.8k
1
vote
1
answer
418
views
What is wrong with this Lisp Function?
This function is a CLisp function, this is part of a homework problem, but which is supposed to be written in this different format (the second function).
(defun range (m M) (cond
((> m M) '() )
((...
- 11
1
vote
2
answers
206
views
scheme2lisp::define function and pass it as parameter
I need to translate some code from Scheme to Common Lisp. Now, I have something like this:
(defun sum (term a next b)
(if (> a b)
0
(+ (term a) (sum term (next a) b))))
(defun sum-int (...
- 15.8k
15
votes
7
answers
1k
views
can if be a proper function rather than a special form
I finally started learning functional languages (emacs lisp) and it makes explicit distinction between functions and special forms such as flow control , for example if.
Is there a fundamental/...
- 51.6k