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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, beg, len) |
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21 ## |
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22 ## Returns the substring of S of length LEN starting at index BEG. |
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23 ## If LEN is missing, the substring extends to the end of S. |
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24 |
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25 function t = substr (s, beg, len) |
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26 |
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27 ## Original version by Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>. |
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28 |
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29 if (nargin < 2 || nargin > 3) |
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30 usage ("substr (s, beg, len)"); |
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31 endif |
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32 |
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33 if (isstr (s)) |
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34 nc = columns (s); |
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35 if (beg > 0 && beg <= nc) |
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36 if (nargin == 2) |
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37 eos = nc; |
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38 else |
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39 eos = beg + len - 1; |
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40 endif |
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41 if (eos <= nc) |
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42 t = s (:, beg:eos); |
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43 else |
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44 error ("substr: length = %d out of range", len); |
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45 endif |
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46 else |
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47 error ("substr: beginning index = %d out of range", beg); |
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48 endif |
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49 else |
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50 error ("substr: expecting string argument"); |
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51 endif |
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52 |
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53 endfunction |
