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## Copyright (C) 1993, 1994, 1995 John W. Eaton
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by the
## Free Software Foundation; either version 2, or (at your option) any
## later version.
##
## Octave is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
## for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, write to the Free
## Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
## usage: linspace (x1, x2, n)
##
## Return a vector of n equally spaced points between x1 and x2
## inclusive.
##
## If the final argument is omitted, n = 100 is assumed.
##
## All three arguments must be scalars.
##
## See also: logspace
## Author: jwe
function retval = linspace (x1, x2, n)
if (nargin == 2)
npoints = 100;
elseif (nargin == 3)
if (length (n) == 1)
npoints = fix (n);
else
error ("linspace: arguments must be scalars");
endif
else
usage ("linspace (x1, x2 [, n])");
endif
if (npoints < 2)
error ("linspace: npoints must be greater than 2");
endif
## In some cases x1 + delta * (npoints - 1) will not be equal to x2,
## so we cheat and force the last value to be x2.
if (length (x1) == 1 && length (x2) == 1)
delta = (x2 - x1) / (npoints - 1);
retval = [x1+(0:npoints-2)*delta, x2];
else
error ("linspace: arguments must be scalars");
endif
endfunction
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