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## Copyright (C) 2000 Kai Habel
##
## This program 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 3 of the License, or (at your option) any later
## version.
##
## This program 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
## this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} { } fnplt (@var{pp}, '@var{plt}')
## plots spline
##
## @seealso{ppval, spline, csape}
## @end deftypefn
## Author: Kai Habel <kai.habel@gmx.de>
## Date: 3. dec 2000
## 2001-02-19 Paul Kienzle
## * use pp.x rather than just x in linspace; add plt parameter
## * return points instead of plotting them if desired
## * also plot control points
## * added demo
function [x, y] = fnplt (pp, plt)
if (nargin < 1 || nargin > 2)
usage ("[x, y] = fnplt (pp [, plotstring])");
endif
if (nargin < 2)
plt = "r;;";
endif
xi = linspace(min(pp.x),max(pp.x),256)';
pts = ppval(pp,xi);
if nargout == 2
x = xi;
y = pts;
elseif nargout == 1
x = [xi, pts];
else
plot(xi,pts,plt,pp.x,ppval(pp,pp.x),"bx;;");
endif
endfunction
%!demo
%! x = [ 0; sort(rand(25,1)); 1 ];
%! pp = csape (x, sin (2*pi*3*x), 'periodic');
%! axis([0,1,-2,2]);
%! title('Periodic spline reconstruction of randomly sampled sine');
%! fnplt (pp,'r;reconstruction;');
%! t=linspace(0,1,100); y=sin(2*pi*3*t);
%! hold on; plot(t,y,'g;ideal;'); hold off;
%! axis; title("");

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