1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
;;;; *************************************************************************
;;;; FILE IDENTIFICATION
;;;;
;;;; Name: seqs.lisp
;;;; Purpose: Sequence functions for KMRCL package
;;;; Programmer: Kevin M. Rosenberg
;;;; Date Started: Apr 2000
;;;;
;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
;;;;
;;;; KMRCL users are granted the rights to distribute and use this software
;;;; as governed by the terms of the Lisp Lesser GNU Public License
;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
;;;; *************************************************************************
(in-package #:kmrcl)
(defun nsubseq (sequence start &optional end)
"Return a subsequence by pointing to location in original sequence"
(unless end (setq end (length sequence)))
(make-array (- end start)
:element-type (array-element-type sequence)
:displaced-to sequence
:displaced-index-offset start))
|