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annotate scripts/strings/substr.m @ 2355:c9f70d39255f

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[project @ 1996-08-20 23:30:54 by jwe]
author jwe
date Tue, 20 Aug 1996 23:32:09 +0000
parents b5568c31ee2c
children 4f40efa995c1
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1 ## Copyright (C) 1996 Kurt Hornik
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 2, or (at your option)
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8 ## any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, write to the Free
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17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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18 ## 02111-1307, USA.
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19
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20 ## usage: substr (s, offset, len)
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21 ##
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22 ## Returns the substring of S of length LEN starting at index OFFSET.
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23 ## If OFFSET is negative, extraction starts that far from the end of
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24 ## the string. If LEN is omitted, the substring extends to the end
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25 ## of S.
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26
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27 ## Author: Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>
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28 ## Adapted-By: jwe
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29
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30 function t = substr (s, offset, len)
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31
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32 if (nargin < 2 || nargin > 3)
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33 usage ("substr (s, offset [, len])");
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34 endif
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35
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36 if (isstr (s))
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37 nc = columns (s);
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38 if (abs (offset) > 0 && abs (offset) <= nc)
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39 if (offset > 0)
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40 beg = offset;
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41 else
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42 beg = nc + offset + 1;
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43 endif
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44 if (nargin == 2)
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45 eos = nc;
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46 else
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47 eos = beg + len - 1;
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48 endif
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49 if (eos <= nc)
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50 t = s (:, beg:eos);
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51 else
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52 error ("substr: length = %d out of range", len);
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53 endif
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54 else
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55 error ("substr: offset = %d out of range", offset);
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56 endif
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57 else
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58 error ("substr: expecting string argument");
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59 endif
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60
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61 endfunction