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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 the |
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7 # Free Software Foundation; either version 2, or (at your option) any |
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8 # later version. |
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9 # |
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10 # Octave is distributed in the hope that it will be useful, but WITHOUT |
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11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 # 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 02111-1307, USA. |
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18 |
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19 function t = substr (s, beg, len) |
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20 |
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21 # usage: substr (s, beg, len) |
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22 # |
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23 # Returns the substring of S of length LEN starting at index BEG. |
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24 # If LEN is missing, the substring extends to the end of S. |
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25 |
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26 # Original version by Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>. |
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27 |
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28 if (nargin < 2 || nargin > 3) |
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29 usage ("substr (s, beg, len)"); |
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30 endif |
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31 |
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32 if (isstr (s)) |
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33 nc = columns (s); |
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34 if (beg > 0 && beg <= nc) |
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35 if (nargin == 2) |
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36 eos = nc; |
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37 else |
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38 eos = beg + len - 1; |
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39 endif |
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40 if (eos <= nc) |
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41 t = s (:, beg:eos); |
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42 else |
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43 error ("substr: length = %d out of range", len); |
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44 endif |
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45 else |
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46 error ("substr: beginning index = %d out of range", beg); |
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47 endif |
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48 else |
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49 error ("substr: expecting string argument"); |
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50 endif |
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51 |
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52 endfunction |
