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annotate scripts/general/linspace.m @ 1098:c0f319a1e51d

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[project @ 1995-02-13 16:46:08 by jwe]
author jwe
date Mon, 13 Feb 1995 16:46:08 +0000
parents 3f257ab07921
children 6243c37ae2c5
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1 # Copyright (C) 1993, 1994, 1995 John W. Eaton
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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
16a24e76d6e0 [project @ 1993-12-03 02:00:15 by jwe]
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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, 675 Mass Ave, Cambridge, MA 02139, USA.
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18
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19 function retval = linspace (x1, x2, n)
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20
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21 # usage: linspace (x1, x2, n)
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22 #
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23 # Return a vector of n equally spaced points between x1 and x2
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24 # inclusive.
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25 #
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26 # If the final argument is omitted, n = 100 is assumed.
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27 #
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28 # All three arguments must be scalars.
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29 #
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30 # See also: logspace
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31
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32 if (nargin == 2)
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33 npoints = 100;
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34 elseif (nargin == 3)
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35 if (length (n) == 1)
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36 npoints = fix (n);
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37 else
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38 error ("linspace: arguments must be scalars");
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39 endif
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40 else
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41 usage ("linspace (x1, x2 [, n])");
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42 endif
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43
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44 if (npoints < 2)
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45 error ("linspace: npoints must be greater than 2");
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46 endif
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47
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48 # In some cases x1 + delta * (npoints - 1) will not be equal to x2, so
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49 # we cheat and force the last value to be x2.
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50
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51 if (length (x1) == 1 && length (x2) == 1)
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52 delta = (x2 - x1) / (npoints - 1);
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53 retval = [x1+(0:npoints-2)*delta, x2];
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54 else
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55 error ("linspace: arguments must be scalars");
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56 endif
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57
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58 endfunction