Mercurial > forge
view extra/nurbs/inst/kntbrkdegreg.m @ 12662:2a027badd794 octave-forge
Added a message id in the warning
author | rafavzqz |
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date | Tue, 07 Jul 2015 13:52:48 +0000 |
parents | 37d08939bb7b |
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% KNTBRKDEGREG: Construct an open knot vector by giving the sequence of % knots, the degree and the regularity. % % knots = kntbrkdegreg (breaks, degree) % knots = kntbrkdegreg (breaks, degree, regularity) % % INPUT: % % breaks: sequence of knots. % degree: polynomial degree of the splines associated to the knot vector. % regularity: splines regularity. % % OUTPUT: % % knots: knot vector. % % If REGULARITY has as many entries as BREAKS, or as the number of interior % knots, a different regularity will be assigned to each knot. If % REGULARITY is not present, it will be taken equal to DEGREE-1. % % Copyright (C) 2010 Carlo de Falco, Rafael Vazquez % % 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/>. function knots = kntbrkdegreg (breaks, degree, reg) if (iscell (breaks)) if (nargin == 2) reg = degree - 1; end if (numel(breaks)~=numel(degree) || numel(breaks)~=numel(reg)) error('kntbrkdegreg: degree and regularity must have the same length as the number of knot vectors') end degree = num2cell (degree); if (~iscell (reg)) reg = num2cell (reg); end knots = cellfun (@do_kntbrkdegreg, breaks, degree, reg, 'uniformoutput', false); else if (nargin == 2) reg = degree - 1; end knots = do_kntbrkdegreg (breaks, degree, reg); end end function knots = do_kntbrkdegreg (breaks, degree, reg) if (numel (breaks) < 2) error ('kntbrkdegreg: the knots sequence should contain at least two points') end if (numel (reg) == 1) mults = [-1, (degree (ones (1, numel (breaks) - 2)) - reg), -1]; elseif (numel (reg) == numel (breaks)) mults = degree - reg; elseif (numel (reg) == numel (breaks) - 2) mults = [-1 degree-reg -1]; else error('kntbrkdegreg: the length of mult should be equal to one or the number of knots') end if (any (reg < -1)) warning ('kntbrkdegreg: for some knots the regularity is lower than -1') elseif (any (reg > degree-1)) error('kntbrkdegreg: the regularity should be lower than the degree') end knots = kntbrkdegmult (breaks, degree, mults); end %!test %! breaks = [0 1 2 3 4]; %! degree = 3; %! knots = kntbrkdegreg (breaks, degree); %! assert (knots, [0 0 0 0 1 2 3 4 4 4 4]) %!test %! breaks = [0 1 2 3 4]; %! degree = 3; %! reg = 1; %! knots = kntbrkdegreg (breaks, degree, reg); %! assert (knots, [0 0 0 0 1 1 2 2 3 3 4 4 4 4]) %!test %! breaks = [0 1 2 3 4]; %! degree = 3; %! reg = [0 1 2]; %! knots = kntbrkdegreg (breaks, degree, reg); %! assert (knots, [0 0 0 0 1 1 1 2 2 3 4 4 4 4]) %!test %! breaks = {[0 1 2 3 4] [0 1 2 3]}; %! degree = [3 2]; %! reg = {[0 1 2] 0}; %! knots = kntbrkdegreg (breaks, degree, reg); %! assert (knots, {[0 0 0 0 1 1 1 2 2 3 4 4 4 4] [0 0 0 1 1 2 2 3 3 3]})