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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 |
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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 ## usage: linspace (x1, x2, n) |
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20 ## |
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21 ## Return a vector of n equally spaced points between x1 and x2 |
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22 ## inclusive. |
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23 ## |
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24 ## If the final argument is omitted, n = 100 is assumed. |
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25 ## |
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26 ## All three arguments must be scalars. |
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27 ## |
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28 ## See also: logspace |
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29 |
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30 ## Author: jwe |
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31 |
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32 function retval = linspace (x1, x2, n) |
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33 |
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34 if (nargin == 2) |
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35 npoints = 100; |
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36 elseif (nargin == 3) |
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37 if (length (n) == 1) |
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38 npoints = fix (n); |
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39 else |
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40 error ("linspace: arguments must be scalars"); |
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41 endif |
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42 else |
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43 usage ("linspace (x1, x2 [, n])"); |
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44 endif |
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45 |
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46 if (npoints < 2) |
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47 error ("linspace: npoints must be greater than 2"); |
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48 endif |
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49 |
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50 ## In some cases x1 + delta * (npoints - 1) will not be equal to x2, |
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51 ## so we cheat and force the last value to be x2. |
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52 |
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53 if (length (x1) == 1 && length (x2) == 1) |
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54 delta = (x2 - x1) / (npoints - 1); |
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55 retval = [x1+(0:npoints-2)*delta, x2]; |
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56 else |
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57 error ("linspace: arguments must be scalars"); |
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58 endif |
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59 |
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60 endfunction |
