X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?a=blobdiff_plain;ds=sidebyside;f=octave_packages%2Fsplines-1.0.7%2Ffnder.m;fp=octave_packages%2Fsplines-1.0.7%2Ffnder.m;h=f5094f47b5bbc8e118db628a756c975950cf9e08;hb=f5f7a74bd8a4900f0b797da6783be80e11a68d86;hp=0000000000000000000000000000000000000000;hpb=1705066eceaaea976f010f669ce8e972f3734b05;p=CreaPhase.git
diff --git a/octave_packages/splines-1.0.7/fnder.m b/octave_packages/splines-1.0.7/fnder.m
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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 2 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 .
+
+## -*- texinfo -*-
+## @deftypefn {Function File} { } fnder (@var{pp}, @var{order})
+## differentiate the spline in pp-form
+##
+## @seealso{ppval}
+## @end deftypefn
+
+## Author: Kai Habel
+## Date: 20. feb 2001
+
+function dpp = fnder (pp, o)
+
+ if (nargin < 1 || nargin > 2)
+ usage ("fnder (pp [, order])");
+ endif
+ if (nargin < 2)
+ o = 1;
+ endif
+
+ [X, P, N, K, D] = unmkpp (pp);
+ c = columns (P);
+ r = rows (P);
+
+ for i = 1:o
+ #pp.P = polyder (pp.P); matrix capable polyder is needed.
+ P = P(:, 1:c - 1) .* kron ((c - 1):- 1:1, ones (r,1));
+ endfor
+
+ dpp = mkpp (X, P);
+
+endfunction