Questions tagged [lisp]
Lisp is a family of general purpose programming languages, influenced by the lambda calculus, and with the ability to manipulate source code as a data structure.
lisp
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How to use symbolic expressions produced by a function to define another function?
I am trying to make a symbolic derivation function in Chez scheme. It works alright-ish (simplification is not yet being done):
(define (derive var expr)
;; var is the direction in which you would ...
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1
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Why does Scheme use the procedural representation of pairs?
I am reading SICP. It says in 2.1.3:
That is, the operations satisfy the condition that, for any objects x and y, if z is (cons x y) then (car z) is x and (cdr z) is y. ... Here are the definitions:
...
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Interlisp Medley: LITATOM 'streams' no longer supported
I am trying to print string text to file in interlisp medley. Here is the code:
(OUTPUT)
> T
(SETQ OUT (OPENSTREAM 'output.TEDIT 'OUTPUT))
> <Output stream ...>
(OUTPUT OUT)
> T
(PRIN1 '...
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Error, the sbcl repl is not recognizing the cl-lsp package even after configuring quicklisp
I'm trying to install cl-lsp to program in common lisp, the installation process is actually quite simple, first I cloned the cl-lsp repository, then I downloaded quicklisp and then I started the sbcl ...
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Write text I/O stream to file with Interlisp Medley
I am tring to write text stream to file in Interlisp, Medley. I have searched everywhere (onine and in the books) but could not find a feasible command for I/O stream file operation in Interlisp.
...
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2
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80
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The reason for strings instead of symbols
I was wondering about passing a string to check the existence of a symbol, so I created the following function,
but all the answers were :INTERNAL, so it was useless.
I understand the reason, but does ...
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How can I lazily traverse a directory in lisp?
I've been working on processing a large amount of files with lisp and encountering an issue listing directory contents when there are millions of files in a directory.
I found cl-fad and the (list-...
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Error handling mode on saving application is ignored
I'm having a problem with images with prepended kernel on MacOS. Regardless of :error-handler argument value I provide to the save-application function, if an application fails with an error, I/O ...
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Lex S-Expressions C++
I'm trying to build a high-performance, S-Expression based, C++/LLVM compiled DSL. I've written a small lexer for it, but I'm getting an infinite loop for all test cases I try without errors (which ...
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How do I use format in Lisp without it addint newlines/indentation when formatting an array?
Here's my issue:
I am using format on an array of long strings, and, apparently by default when using the ~s directive, it adds newlines and two spaces of indentation.
This is really great for human ...
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LISP - Arrow on 3d polyline to show water flow direction
I will appreciate if someone could help modify this nice LISP written by Stefan and Jonathan that I founded here:
https://www.cadtutor.net/forum/topic/57478-arrow-on-3d-polyline-to-show-water-flow-...
- 101
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How to Validate Phone Numbers in Plait without Using Regex?
I'm working on a project in Plait, a sublanguage of Racket, and I need to validate phone numbers. The phone numbers should be in the format "xxx-xxx-xxxx" where the area code is either "...
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Understanding lisp in the law of demeter paper
The law of Demeter paper contains snippets of some version of Lisp. Since I do not know Lisp I went ahead and tried to get an overview of the syntax. However the Lisp in that paper seems to be an ...
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Handle return results by MassProp command in Python
I'm trying to handle return results by MassProp command in Python code:
acad.doc.SendCommand("MassProp")
res1 = acad.doc.GetVariable("AREA");
res2 = acad.doc.GetVariable("...
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How to write a macro for loop in lisp imitating a for loop in C or Java?
In lisp, I would like to write a macro for loop without using the loop function in lisp which imitates a for loop in C or Java. I’d like to achieve this with only the basic lisp syntax.
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